5 collectd.conf - Configuration for the system statistics collection daemon B<collectd>
9 BaseDir "/var/lib/collectd"
10 PIDFile "/run/collectd.pid"
31 This config file controls how the system statistics collection daemon
32 B<collectd> behaves. The most significant option is B<LoadPlugin>, which
33 controls which plugins to load. These plugins ultimately define collectd's
34 behavior. If the B<AutoLoadPlugin> option has been enabled, the explicit
35 B<LoadPlugin> lines may be omitted for all plugins with a configuration block,
36 i.e. a C<E<lt>PluginE<nbsp>...E<gt>> block.
38 The syntax of this config file is similar to the config file of the famous
39 I<Apache> webserver. Each line contains either an option (a key and a list of
40 one or more values) or a section-start or -end. Empty lines and everything
41 after a non-quoted hash-symbol (C<#>) are ignored. I<Keys> are unquoted
42 strings, consisting only of alphanumeric characters and the underscore (C<_>)
43 character. Keys are handled case insensitive by I<collectd> itself and all
44 plugins included with it. I<Values> can either be an I<unquoted string>, a
45 I<quoted string> (enclosed in double-quotes) a I<number> or a I<boolean>
46 expression. I<Unquoted strings> consist of only alphanumeric characters and
47 underscores (C<_>) and do not need to be quoted. I<Quoted strings> are
48 enclosed in double quotes (C<">). You can use the backslash character (C<\>)
49 to include double quotes as part of the string. I<Numbers> can be specified in
50 decimal and floating point format (using a dot C<.> as decimal separator),
51 hexadecimal when using the C<0x> prefix and octal with a leading zero (C<0>).
52 I<Boolean> values are either B<true> or B<false>.
54 Lines may be wrapped by using C<\> as the last character before the newline.
55 This allows long lines to be split into multiple lines. Quoted strings may be
56 wrapped as well. However, those are treated special in that whitespace at the
57 beginning of the following lines will be ignored, which allows for nicely
58 indenting the wrapped lines.
60 The configuration is read and processed in order, i.e. from top to bottom. So
61 the plugins are loaded in the order listed in this config file. It is a good
62 idea to load any logging plugins first in order to catch messages from plugins
63 during configuration. Also, unless B<AutoLoadPlugin> is enabled, the
64 B<LoadPlugin> option I<must> occur I<before> the appropriate
65 C<E<lt>B<Plugin> ...E<gt>> block.
71 =item B<BaseDir> I<Directory>
73 Sets the base directory. This is the directory beneath which all RRD-files are
74 created. Possibly more subdirectories are created. This is also the working
75 directory for the daemon.
77 =item B<LoadPlugin> I<Plugin>
79 Loads the plugin I<Plugin>. This is required to load plugins, unless the
80 B<AutoLoadPlugin> option is enabled (see below). Without any loaded plugins,
81 I<collectd> will be mostly useless.
83 Only the first B<LoadPlugin> statement or block for a given plugin name has any
84 effect. This is useful when you want to split up the configuration into smaller
85 files and want each file to be "self contained", i.e. it contains a B<Plugin>
86 block I<and> the appropriate B<LoadPlugin> statement. The downside is that if
87 you have multiple conflicting B<LoadPlugin> blocks, e.g. when they specify
88 different intervals, only one of them (the first one encountered) will take
89 effect and all others will be silently ignored.
91 B<LoadPlugin> may either be a simple configuration I<statement> or a I<block>
92 with additional options, affecting the behavior of B<LoadPlugin>. A simple
93 statement looks like this:
97 Options inside a B<LoadPlugin> block can override default settings and
98 influence the way plugins are loaded, e.g.:
104 The following options are valid inside B<LoadPlugin> blocks:
108 =item B<Globals> B<true|false>
110 If enabled, collectd will export all global symbols of the plugin (and of all
111 libraries loaded as dependencies of the plugin) and, thus, makes those symbols
112 available for resolving unresolved symbols in subsequently loaded plugins if
113 that is supported by your system.
115 This is useful (or possibly even required), e.g., when loading a plugin that
116 embeds some scripting language into the daemon (e.g. the I<Perl> and
117 I<Python plugins>). Scripting languages usually provide means to load
118 extensions written in C. Those extensions require symbols provided by the
119 interpreter, which is loaded as a dependency of the respective collectd plugin.
120 See the documentation of those plugins (e.g., L<collectd-perl(5)> or
121 L<collectd-python(5)>) for details.
123 By default, this is disabled. As a special exception, if the plugin name is
124 either C<perl> or C<python>, the default is changed to enabled in order to keep
125 the average user from ever having to deal with this low level linking stuff.
127 =item B<Interval> I<Seconds>
129 Sets a plugin-specific interval for collecting metrics. This overrides the
130 global B<Interval> setting. If a plugin provides its own support for specifying
131 an interval, that setting will take precedence.
133 =item B<FlushInterval> I<Seconds>
135 Specifies the interval, in seconds, to call the flush callback if it's
136 defined in this plugin. By default, this is disabled.
138 =item B<FlushTimeout> I<Seconds>
140 Specifies the value of the timeout argument of the flush callback.
144 =item B<AutoLoadPlugin> B<false>|B<true>
146 When set to B<false> (the default), each plugin needs to be loaded explicitly,
147 using the B<LoadPlugin> statement documented above. If a
148 B<E<lt>PluginE<nbsp>...E<gt>> block is encountered and no configuration
149 handling callback for this plugin has been registered, a warning is logged and
150 the block is ignored.
152 When set to B<true>, explicit B<LoadPlugin> statements are not required. Each
153 B<E<lt>PluginE<nbsp>...E<gt>> block acts as if it was immediately preceded by a
154 B<LoadPlugin> statement. B<LoadPlugin> statements are still required for
155 plugins that don't provide any configuration, e.g. the I<Load plugin>.
157 =item B<CollectInternalStats> B<false>|B<true>
159 When set to B<true>, various statistics about the I<collectd> daemon will be
160 collected, with "collectd" as the I<plugin name>. Defaults to B<false>.
162 The following metrics are reported:
166 =item C<collectd-write_queue/queue_length>
168 The number of metrics currently in the write queue. You can limit the queue
169 length with the B<WriteQueueLimitLow> and B<WriteQueueLimitHigh> options.
171 =item C<collectd-write_queue/derive-dropped>
173 The number of metrics dropped due to a queue length limitation.
174 If this value is non-zero, your system can't handle all incoming metrics and
175 protects itself against overload by dropping metrics.
177 =item C<collectd-cache/cache_size>
179 The number of elements in the metric cache (the cache you can interact with
180 using L<collectd-unixsock(5)>).
184 =item B<Include> I<Path> [I<pattern>]
186 If I<Path> points to a file, includes that file. If I<Path> points to a
187 directory, recursively includes all files within that directory and its
188 subdirectories. If the C<wordexp> function is available on your system,
189 shell-like wildcards are expanded before files are included. This means you can
190 use statements like the following:
192 Include "/etc/collectd.d/*.conf"
194 Starting with version 5.3, this may also be a block in which further options
195 affecting the behavior of B<Include> may be specified. The following option is
198 <Include "/etc/collectd.d">
204 =item B<Filter> I<pattern>
206 If the C<fnmatch> function is available on your system, a shell-like wildcard
207 I<pattern> may be specified to filter which files to include. This may be used
208 in combination with recursively including a directory to easily be able to
209 arbitrarily mix configuration files and other documents (e.g. README files).
210 The given example is similar to the first example above but includes all files
211 matching C<*.conf> in any subdirectory of C</etc/collectd.d>.
215 If more than one file is included by a single B<Include> option, the files
216 will be included in lexicographical order (as defined by the C<strcmp>
217 function). Thus, you can e.E<nbsp>g. use numbered prefixes to specify the
218 order in which the files are loaded.
220 To prevent loops and shooting yourself in the foot in interesting ways the
221 nesting is limited to a depth of 8E<nbsp>levels, which should be sufficient for
222 most uses. Since symlinks are followed it is still possible to crash the daemon
223 by looping symlinks. In our opinion significant stupidity should result in an
224 appropriate amount of pain.
226 It is no problem to have a block like C<E<lt>Plugin fooE<gt>> in more than one
227 file, but you cannot include files from within blocks.
229 =item B<PIDFile> I<File>
231 Sets where to write the PID file to. This file is overwritten when it exists
232 and deleted when the program is stopped. Some init-scripts might override this
233 setting using the B<-P> command-line option.
235 =item B<PluginDir> I<Directory>
237 Path to the plugins (shared objects) of collectd.
239 =item B<TypesDB> I<File> [I<File> ...]
241 Set one or more files that contain the data-set descriptions. See
242 L<types.db(5)> for a description of the format of this file.
244 If this option is not specified, a default file is read. If you need to define
245 custom types in addition to the types defined in the default file, you need to
246 explicitly load both. In other words, if the B<TypesDB> option is encountered
247 the default behavior is disabled and if you need the default types you have to
248 also explicitly load them.
250 =item B<Interval> I<Seconds>
252 Configures the interval in which to query the read plugins. Obviously smaller
253 values lead to a higher system load produced by collectd, while higher values
254 lead to more coarse statistics.
256 B<Warning:> You should set this once and then never touch it again. If you do,
257 I<you will have to delete all your RRD files> or know some serious RRDtool
258 magic! (Assuming you're using the I<RRDtool> or I<RRDCacheD> plugin.)
260 =item B<MaxReadInterval> I<Seconds>
262 A read plugin doubles the interval between queries after each failed attempt
265 This options limits the maximum value of the interval. The default value is
268 =item B<Timeout> I<Iterations>
270 Consider a value list "missing" when no update has been read or received for
271 I<Iterations> iterations. By default, I<collectd> considers a value list
272 missing when no update has been received for twice the update interval. Since
273 this setting uses iterations, the maximum allowed time without update depends
274 on the I<Interval> information contained in each value list. This is used in
275 the I<Threshold> configuration to dispatch notifications about missing values,
276 see L<collectd-threshold(5)> for details.
278 =item B<ReadThreads> I<Num>
280 Number of threads to start for reading plugins. The default value is B<5>, but
281 you may want to increase this if you have more than five plugins that take a
282 long time to read. Mostly those are plugins that do network-IO. Setting this to
283 a value higher than the number of registered read callbacks is not recommended.
285 =item B<WriteThreads> I<Num>
287 Number of threads to start for dispatching value lists to write plugins. The
288 default value is B<5>, but you may want to increase this if you have more than
289 five plugins that may take relatively long to write to.
291 =item B<WriteQueueLimitHigh> I<HighNum>
293 =item B<WriteQueueLimitLow> I<LowNum>
295 Metrics are read by the I<read threads> and then put into a queue to be handled
296 by the I<write threads>. If one of the I<write plugins> is slow (e.g. network
297 timeouts, I/O saturation of the disk) this queue will grow. In order to avoid
298 running into memory issues in such a case, you can limit the size of this
301 By default, there is no limit and memory may grow indefinitely. This is most
302 likely not an issue for clients, i.e. instances that only handle the local
303 metrics. For servers it is recommended to set this to a non-zero value, though.
305 You can set the limits using B<WriteQueueLimitHigh> and B<WriteQueueLimitLow>.
306 Each of them takes a numerical argument which is the number of metrics in the
307 queue. If there are I<HighNum> metrics in the queue, any new metrics I<will> be
308 dropped. If there are less than I<LowNum> metrics in the queue, all new metrics
309 I<will> be enqueued. If the number of metrics currently in the queue is between
310 I<LowNum> and I<HighNum>, the metric is dropped with a probability that is
311 proportional to the number of metrics in the queue (i.e. it increases linearly
312 until it reaches 100%.)
314 If B<WriteQueueLimitHigh> is set to non-zero and B<WriteQueueLimitLow> is
315 unset, the latter will default to half of B<WriteQueueLimitHigh>.
317 If you do not want to randomly drop values when the queue size is between
318 I<LowNum> and I<HighNum>, set B<WriteQueueLimitHigh> and B<WriteQueueLimitLow>
321 Enabling the B<CollectInternalStats> option is of great help to figure out the
322 values to set B<WriteQueueLimitHigh> and B<WriteQueueLimitLow> to.
324 =item B<Hostname> I<Name>
326 Sets the hostname that identifies a host. If you omit this setting, the
327 hostname will be determined using the L<gethostname(2)> system call.
329 =item B<FQDNLookup> B<true|false>
331 If B<Hostname> is determined automatically this setting controls whether or not
332 the daemon should try to figure out the "fully qualified domain name", FQDN.
333 This is done using a lookup of the name returned by C<gethostname>. This option
334 is enabled by default.
336 =item B<PreCacheChain> I<ChainName>
338 =item B<PostCacheChain> I<ChainName>
340 Configure the name of the "pre-cache chain" and the "post-cache chain". Please
341 see L</"FILTER CONFIGURATION"> below on information on chains and how these
342 setting change the daemon's behavior.
346 =head1 PLUGIN OPTIONS
348 Some plugins may register own options. These options must be enclosed in a
349 C<Plugin>-Section. Which options exist depends on the plugin used. Some plugins
350 require external configuration, too. The C<apache plugin>, for example,
351 required C<mod_status> to be configured in the webserver you're going to
352 collect data from. These plugins are listed below as well, even if they don't
353 require any configuration within collectd's configuration file.
355 A list of all plugins and a short summary for each plugin can be found in the
356 F<README> file shipped with the sourcecode and hopefully binary packets as
359 =head2 Plugin C<aggregation>
361 The I<Aggregation plugin> makes it possible to aggregate several values into
362 one using aggregation functions such as I<sum>, I<average>, I<min> and I<max>.
363 This can be put to a wide variety of uses, e.g. average and total CPU
364 statistics for your entire fleet.
366 The grouping is powerful but, as with many powerful tools, may be a bit
367 difficult to wrap your head around. The grouping will therefore be
368 demonstrated using an example: The average and sum of the CPU usage across
369 all CPUs of each host is to be calculated.
371 To select all the affected values for our example, set C<Plugin cpu> and
372 C<Type cpu>. The other values are left unspecified, meaning "all values". The
373 I<Host>, I<Plugin>, I<PluginInstance>, I<Type> and I<TypeInstance> options
374 work as if they were specified in the C<WHERE> clause of an C<SELECT> SQL
380 Although the I<Host>, I<PluginInstance> (CPU number, i.e. 0, 1, 2, ...) and
381 I<TypeInstance> (idle, user, system, ...) fields are left unspecified in the
382 example, the intention is to have a new value for each host / type instance
383 pair. This is achieved by "grouping" the values using the C<GroupBy> option.
384 It can be specified multiple times to group by more than one field.
387 GroupBy "TypeInstance"
389 We do neither specify nor group by I<plugin instance> (the CPU number), so all
390 metrics that differ in the CPU number only will be aggregated. Each
391 aggregation needs I<at least one> such field, otherwise no aggregation would
394 The full example configuration looks like this:
396 <Plugin "aggregation">
402 GroupBy "TypeInstance"
405 CalculateAverage true
409 There are a couple of limitations you should be aware of:
415 The I<Type> cannot be left unspecified, because it is not reasonable to add
416 apples to oranges. Also, the internal lookup structure won't work if you try
421 There must be at least one unspecified, ungrouped field. Otherwise nothing
426 As you can see in the example above, each aggregation has its own
427 B<Aggregation> block. You can have multiple aggregation blocks and aggregation
428 blocks may match the same values, i.e. one value list can update multiple
429 aggregations. The following options are valid inside B<Aggregation> blocks:
433 =item B<Host> I<Host>
435 =item B<Plugin> I<Plugin>
437 =item B<PluginInstance> I<PluginInstance>
439 =item B<Type> I<Type>
441 =item B<TypeInstance> I<TypeInstance>
443 Selects the value lists to be added to this aggregation. B<Type> must be a
444 valid data set name, see L<types.db(5)> for details.
446 If the string starts with and ends with a slash (C</>), the string is
447 interpreted as a I<regular expression>. The regex flavor used are POSIX
448 extended regular expressions as described in L<regex(7)>. Example usage:
450 Host "/^db[0-9]\\.example\\.com$/"
452 =item B<GroupBy> B<Host>|B<Plugin>|B<PluginInstance>|B<TypeInstance>
454 Group valued by the specified field. The B<GroupBy> option may be repeated to
455 group by multiple fields.
457 =item B<SetHost> I<Host>
459 =item B<SetPlugin> I<Plugin>
461 =item B<SetPluginInstance> I<PluginInstance>
463 =item B<SetTypeInstance> I<TypeInstance>
465 Sets the appropriate part of the identifier to the provided string.
467 The I<PluginInstance> should include the placeholder C<%{aggregation}> which
468 will be replaced with the aggregation function, e.g. "average". Not including
469 the placeholder will result in duplication warnings and/or messed up values if
470 more than one aggregation function are enabled.
472 The following example calculates the average usage of all "even" CPUs:
474 <Plugin "aggregation">
477 PluginInstance "/[0,2,4,6,8]$/"
481 SetPluginInstance "even-%{aggregation}"
484 GroupBy "TypeInstance"
486 CalculateAverage true
490 This will create the files:
496 foo.example.com/cpu-even-average/cpu-idle
500 foo.example.com/cpu-even-average/cpu-system
504 foo.example.com/cpu-even-average/cpu-user
512 =item B<CalculateNum> B<true>|B<false>
514 =item B<CalculateSum> B<true>|B<false>
516 =item B<CalculateAverage> B<true>|B<false>
518 =item B<CalculateMinimum> B<true>|B<false>
520 =item B<CalculateMaximum> B<true>|B<false>
522 =item B<CalculateStddev> B<true>|B<false>
524 Boolean options for enabling calculation of the number of value lists, their
525 sum, average, minimum, maximum andE<nbsp>/ or standard deviation. All options
526 are disabled by default.
530 =head2 Plugin C<amqp>
532 The I<AMQP plugin> can be used to communicate with other instances of
533 I<collectd> or third party applications using an AMQP message broker. Values
534 are sent to or received from the broker, which handles routing, queueing and
535 possibly filtering out messages.
540 # Send values to an AMQP broker
541 <Publish "some_name">
547 Exchange "amq.fanout"
548 # ExchangeType "fanout"
549 # RoutingKey "collectd"
551 # ConnectionRetryDelay 0
554 # GraphitePrefix "collectd."
555 # GraphiteEscapeChar "_"
556 # GraphiteSeparateInstances false
557 # GraphiteAlwaysAppendDS false
558 # GraphitePreserveSeparator false
561 # Receive values from an AMQP broker
562 <Subscribe "some_name">
568 Exchange "amq.fanout"
569 # ExchangeType "fanout"
572 # QueueAutoDelete true
573 # RoutingKey "collectd.#"
574 # ConnectionRetryDelay 0
578 The plugin's configuration consists of a number of I<Publish> and I<Subscribe>
579 blocks, which configure sending and receiving of values respectively. The two
580 blocks are very similar, so unless otherwise noted, an option can be used in
581 either block. The name given in the blocks starting tag is only used for
582 reporting messages, but may be used to support I<flushing> of certain
583 I<Publish> blocks in the future.
587 =item B<Host> I<Host>
589 Hostname or IP-address of the AMQP broker. Defaults to the default behavior of
590 the underlying communications library, I<rabbitmq-c>, which is "localhost".
592 =item B<Port> I<Port>
594 Service name or port number on which the AMQP broker accepts connections. This
595 argument must be a string, even if the numeric form is used. Defaults to
598 =item B<VHost> I<VHost>
600 Name of the I<virtual host> on the AMQP broker to use. Defaults to "/".
602 =item B<User> I<User>
604 =item B<Password> I<Password>
606 Credentials used to authenticate to the AMQP broker. By default "guest"/"guest"
609 =item B<Exchange> I<Exchange>
611 In I<Publish> blocks, this option specifies the I<exchange> to send values to.
612 By default, "amq.fanout" will be used.
614 In I<Subscribe> blocks this option is optional. If given, a I<binding> between
615 the given exchange and the I<queue> is created, using the I<routing key> if
616 configured. See the B<Queue> and B<RoutingKey> options below.
618 =item B<ExchangeType> I<Type>
620 If given, the plugin will try to create the configured I<exchange> with this
621 I<type> after connecting. When in a I<Subscribe> block, the I<queue> will then
622 be bound to this exchange.
624 =item B<Queue> I<Queue> (Subscribe only)
626 Configures the I<queue> name to subscribe to. If no queue name was configured
627 explicitly, a unique queue name will be created by the broker.
629 =item B<QueueDurable> B<true>|B<false> (Subscribe only)
631 Defines if the I<queue> subscribed to is durable (saved to persistent storage)
632 or transient (will disappear if the AMQP broker is restarted). Defaults to
635 This option should be used in conjunction with the I<Persistent> option on the
638 =item B<QueueAutoDelete> B<true>|B<false> (Subscribe only)
640 Defines if the I<queue> subscribed to will be deleted once the last consumer
641 unsubscribes. Defaults to "true".
643 =item B<RoutingKey> I<Key>
645 In I<Publish> blocks, this configures the routing key to set on all outgoing
646 messages. If not given, the routing key will be computed from the I<identifier>
647 of the value. The host, plugin, type and the two instances are concatenated
648 together using dots as the separator and all containing dots replaced with
649 slashes. For example "collectd.host/example/com.cpu.0.cpu.user". This makes it
650 possible to receive only specific values using a "topic" exchange.
652 In I<Subscribe> blocks, configures the I<routing key> used when creating a
653 I<binding> between an I<exchange> and the I<queue>. The usual wildcards can be
654 used to filter messages when using a "topic" exchange. If you're only
655 interested in CPU statistics, you could use the routing key "collectd.*.cpu.#"
658 =item B<Persistent> B<true>|B<false> (Publish only)
660 Selects the I<delivery method> to use. If set to B<true>, the I<persistent>
661 mode will be used, i.e. delivery is guaranteed. If set to B<false> (the
662 default), the I<transient> delivery mode will be used, i.e. messages may be
663 lost due to high load, overflowing queues or similar issues.
665 =item B<ConnectionRetryDelay> I<Delay>
667 When the connection to the AMQP broker is lost, defines the time in seconds to
668 wait before attempting to reconnect. Defaults to 0, which implies collectd will
669 attempt to reconnect at each read interval (in Subscribe mode) or each time
670 values are ready for submission (in Publish mode).
672 =item B<Format> B<Command>|B<JSON>|B<Graphite> (Publish only)
674 Selects the format in which messages are sent to the broker. If set to
675 B<Command> (the default), values are sent as C<PUTVAL> commands which are
676 identical to the syntax used by the I<Exec> and I<UnixSock plugins>. In this
677 case, the C<Content-Type> header field will be set to C<text/collectd>.
679 If set to B<JSON>, the values are encoded in the I<JavaScript Object Notation>,
680 an easy and straight forward exchange format. The C<Content-Type> header field
681 will be set to C<application/json>.
683 If set to B<Graphite>, values are encoded in the I<Graphite> format, which is
684 "<metric> <value> <timestamp>\n". The C<Content-Type> header field will be set to
687 A subscribing client I<should> use the C<Content-Type> header field to
688 determine how to decode the values. Currently, the I<AMQP plugin> itself can
689 only decode the B<Command> format.
691 =item B<StoreRates> B<true>|B<false> (Publish only)
693 Determines whether or not C<COUNTER>, C<DERIVE> and C<ABSOLUTE> data sources
694 are converted to a I<rate> (i.e. a C<GAUGE> value). If set to B<false> (the
695 default), no conversion is performed. Otherwise the conversion is performed
696 using the internal value cache.
698 Please note that currently this option is only used if the B<Format> option has
701 =item B<GraphitePrefix> (Publish and B<Format>=I<Graphite> only)
703 A prefix can be added in the metric name when outputting in the I<Graphite> format.
704 It's added before the I<Host> name.
705 Metric name will be "<prefix><host><postfix><plugin><type><name>"
707 =item B<GraphitePostfix> (Publish and B<Format>=I<Graphite> only)
709 A postfix can be added in the metric name when outputting in the I<Graphite> format.
710 It's added after the I<Host> name.
711 Metric name will be "<prefix><host><postfix><plugin><type><name>"
713 =item B<GraphiteEscapeChar> (Publish and B<Format>=I<Graphite> only)
715 Specify a character to replace dots (.) in the host part of the metric name.
716 In I<Graphite> metric name, dots are used as separators between different
717 metric parts (host, plugin, type).
718 Default is "_" (I<Underscore>).
720 =item B<GraphiteSeparateInstances> B<true>|B<false>
722 If set to B<true>, the plugin instance and type instance will be in their own
723 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
724 default), the plugin and plugin instance (and likewise the type and type
725 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
727 =item B<GraphiteAlwaysAppendDS> B<true>|B<false>
729 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
730 identifier. If set to B<false> (the default), this is only done when there is
733 =item B<GraphitePreserveSeparator> B<false>|B<true>
735 If set to B<false> (the default) the C<.> (dot) character is replaced with
736 I<GraphiteEscapeChar>. Otherwise, if set to B<true>, the C<.> (dot) character
737 is preserved, i.e. passed through.
741 =head2 Plugin C<apache>
743 To configure the C<apache>-plugin you first need to configure the Apache
744 webserver correctly. The Apache-plugin C<mod_status> needs to be loaded and
745 working and the C<ExtendedStatus> directive needs to be B<enabled>. You can use
746 the following snipped to base your Apache config upon:
749 <IfModule mod_status.c>
750 <Location /mod_status>
751 SetHandler server-status
755 Since its C<mod_status> module is very similar to Apache's, B<lighttpd> is
756 also supported. It introduces a new field, called C<BusyServers>, to count the
757 number of currently connected clients. This field is also supported.
759 The configuration of the I<Apache> plugin consists of one or more
760 C<E<lt>InstanceE<nbsp>/E<gt>> blocks. Each block requires one string argument
761 as the instance name. For example:
765 URL "http://www1.example.com/mod_status?auto"
768 URL "http://www2.example.com/mod_status?auto"
772 The instance name will be used as the I<plugin instance>. To emulate the old
773 (versionE<nbsp>4) behavior, you can use an empty string (""). In order for the
774 plugin to work correctly, each instance name must be unique. This is not
775 enforced by the plugin and it is your responsibility to ensure it.
777 The following options are accepted within each I<Instance> block:
781 =item B<URL> I<http://host/mod_status?auto>
783 Sets the URL of the C<mod_status> output. This needs to be the output generated
784 by C<ExtendedStatus on> and it needs to be the machine readable output
785 generated by appending the C<?auto> argument. This option is I<mandatory>.
787 =item B<User> I<Username>
789 Optional user name needed for authentication.
791 =item B<Password> I<Password>
793 Optional password needed for authentication.
795 =item B<VerifyPeer> B<true|false>
797 Enable or disable peer SSL certificate verification. See
798 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
800 =item B<VerifyHost> B<true|false>
802 Enable or disable peer host name verification. If enabled, the plugin checks
803 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
804 certificate matches the host name provided by the B<URL> option. If this
805 identity check fails, the connection is aborted. Obviously, only works when
806 connecting to a SSL enabled server. Enabled by default.
808 =item B<CACert> I<File>
810 File that holds one or more SSL certificates. If you want to use HTTPS you will
811 possibly need this option. What CA certificates come bundled with C<libcurl>
812 and are checked by default depends on the distribution you use.
814 =item B<SSLCiphers> I<list of ciphers>
816 Specifies which ciphers to use in the connection. The list of ciphers
817 must specify valid ciphers. See
818 L<http://www.openssl.org/docs/apps/ciphers.html> for details.
820 =item B<Timeout> I<Milliseconds>
822 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
823 milliseconds. By default, the configured B<Interval> is used to set the
828 =head2 Plugin C<apcups>
832 =item B<Host> I<Hostname>
834 Hostname of the host running B<apcupsd>. Defaults to B<localhost>. Please note
835 that IPv6 support has been disabled unless someone can confirm or decline that
836 B<apcupsd> can handle it.
838 =item B<Port> I<Port>
840 TCP-Port to connect to. Defaults to B<3551>.
842 =item B<ReportSeconds> B<true>|B<false>
844 If set to B<true>, the time reported in the C<timeleft> metric will be
845 converted to seconds. This is the recommended setting. If set to B<false>, the
846 default for backwards compatibility, the time will be reported in minutes.
848 =item B<PersistentConnection> B<true>|B<false>
850 The plugin is designed to keep the connection to I<apcupsd> open between reads.
851 If plugin poll interval is greater than 15 seconds (hardcoded socket close
852 timeout in I<apcupsd> NIS), then this option is B<false> by default.
854 You can instruct the plugin to close the connection after each read by setting
855 this option to B<false> or force keeping the connection by setting it to B<true>.
857 If I<apcupsd> appears to close the connection due to inactivity quite quickly,
858 the plugin will try to detect this problem and switch to an open-read-close mode.
862 =head2 Plugin C<aquaero>
864 This plugin collects the value of the available sensors in an
865 I<AquaeroE<nbsp>5> board. AquaeroE<nbsp>5 is a water-cooling controller board,
866 manufactured by Aqua Computer GmbH L<http://www.aquacomputer.de/>, with a USB2
867 connection for monitoring and configuration. The board can handle multiple
868 temperature sensors, fans, water pumps and water level sensors and adjust the
869 output settings such as fan voltage or power used by the water pump based on
870 the available inputs using a configurable controller included in the board.
871 This plugin collects all the available inputs as well as some of the output
872 values chosen by this controller. The plugin is based on the I<libaquaero5>
873 library provided by I<aquatools-ng>.
877 =item B<Device> I<DevicePath>
879 Device path of the AquaeroE<nbsp>5's USB HID (human interface device), usually
880 in the form C</dev/usb/hiddevX>. If this option is no set the plugin will try
881 to auto-detect the Aquaero 5 USB device based on vendor-ID and product-ID.
885 =head2 Plugin C<ascent>
887 This plugin collects information about an Ascent server, a free server for the
888 "World of Warcraft" game. This plugin gathers the information by fetching the
889 XML status page using C<libcurl> and parses it using C<libxml2>.
891 The configuration options are the same as for the C<apache> plugin above:
895 =item B<URL> I<http://localhost/ascent/status/>
897 Sets the URL of the XML status output.
899 =item B<User> I<Username>
901 Optional user name needed for authentication.
903 =item B<Password> I<Password>
905 Optional password needed for authentication.
907 =item B<VerifyPeer> B<true|false>
909 Enable or disable peer SSL certificate verification. See
910 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
912 =item B<VerifyHost> B<true|false>
914 Enable or disable peer host name verification. If enabled, the plugin checks
915 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
916 certificate matches the host name provided by the B<URL> option. If this
917 identity check fails, the connection is aborted. Obviously, only works when
918 connecting to a SSL enabled server. Enabled by default.
920 =item B<CACert> I<File>
922 File that holds one or more SSL certificates. If you want to use HTTPS you will
923 possibly need this option. What CA certificates come bundled with C<libcurl>
924 and are checked by default depends on the distribution you use.
926 =item B<Timeout> I<Milliseconds>
928 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
929 milliseconds. By default, the configured B<Interval> is used to set the
934 =head2 Plugin C<barometer>
936 This plugin reads absolute air pressure using digital barometer sensor on a I2C
937 bus. Supported sensors are:
941 =item I<MPL115A2> from Freescale,
942 see L<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL115A>.
945 =item I<MPL3115> from Freescale
946 see L<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL3115A2>.
949 =item I<BMP085> from Bosch Sensortec
953 The sensor type - one of the above - is detected automatically by the plugin
954 and indicated in the plugin_instance (you will see subdirectory
955 "barometer-mpl115" or "barometer-mpl3115", or "barometer-bmp085"). The order of
956 detection is BMP085 -> MPL3115 -> MPL115A2, the first one found will be used
957 (only one sensor can be used by the plugin).
959 The plugin provides absolute barometric pressure, air pressure reduced to sea
960 level (several possible approximations) and as an auxiliary value also internal
961 sensor temperature. It uses (expects/provides) typical metric units - pressure
962 in [hPa], temperature in [C], altitude in [m].
964 It was developed and tested under Linux only. The only platform dependency is
965 the standard Linux i2c-dev interface (the particular bus driver has to
966 support the SM Bus command subset).
968 The reduction or normalization to mean sea level pressure requires (depending
969 on selected method/approximation) also altitude and reference to temperature
970 sensor(s). When multiple temperature sensors are configured the minimum of
971 their values is always used (expecting that the warmer ones are affected by
972 e.g. direct sun light at that moment).
980 TemperatureOffset 0.0
983 TemperatureSensor "myserver/onewire-F10FCA000800/temperature"
988 =item B<Device> I<device>
990 The only mandatory configuration parameter.
992 Device name of the I2C bus to which the sensor is connected. Note that
993 typically you need to have loaded the i2c-dev module.
994 Using i2c-tools you can check/list i2c buses available on your system by:
998 Then you can scan for devices on given bus. E.g. to scan the whole bus 0 use:
1002 This way you should be able to verify that the pressure sensor (either type) is
1003 connected and detected on address 0x60.
1005 =item B<Oversampling> I<value>
1007 Optional parameter controlling the oversampling/accuracy. Default value
1008 is 1 providing fastest and least accurate reading.
1010 For I<MPL115> this is the size of the averaging window. To filter out sensor
1011 noise a simple averaging using floating window of this configurable size is
1012 used. The plugin will use average of the last C<value> measurements (value of 1
1013 means no averaging). Minimal size is 1, maximal 1024.
1015 For I<MPL3115> this is the oversampling value. The actual oversampling is
1016 performed by the sensor and the higher value the higher accuracy and longer
1017 conversion time (although nothing to worry about in the collectd context).
1018 Supported values are: 1, 2, 4, 8, 16, 32, 64 and 128. Any other value is
1019 adjusted by the plugin to the closest supported one.
1021 For I<BMP085> this is the oversampling value. The actual oversampling is
1022 performed by the sensor and the higher value the higher accuracy and longer
1023 conversion time (although nothing to worry about in the collectd context).
1024 Supported values are: 1, 2, 4, 8. Any other value is adjusted by the plugin to
1025 the closest supported one.
1027 =item B<PressureOffset> I<offset>
1029 Optional parameter for MPL3115 only.
1031 You can further calibrate the sensor by supplying pressure and/or temperature
1032 offsets. This is added to the measured/caclulated value (i.e. if the measured
1033 value is too high then use negative offset).
1034 In hPa, default is 0.0.
1036 =item B<TemperatureOffset> I<offset>
1038 Optional parameter for MPL3115 only.
1040 You can further calibrate the sensor by supplying pressure and/or temperature
1041 offsets. This is added to the measured/caclulated value (i.e. if the measured
1042 value is too high then use negative offset).
1043 In C, default is 0.0.
1045 =item B<Normalization> I<method>
1047 Optional parameter, default value is 0.
1049 Normalization method - what approximation/model is used to compute the mean sea
1050 level pressure from the air absolute pressure.
1052 Supported values of the C<method> (integer between from 0 to 2) are:
1056 =item B<0> - no conversion, absolute pressure is simply copied over. For this method you
1057 do not need to configure C<Altitude> or C<TemperatureSensor>.
1059 =item B<1> - international formula for conversion ,
1061 L<http://en.wikipedia.org/wiki/Atmospheric_pressure#Altitude_atmospheric_pressure_variation>.
1062 For this method you have to configure C<Altitude> but do not need
1063 C<TemperatureSensor> (uses fixed global temperature average instead).
1065 =item B<2> - formula as recommended by the Deutsche Wetterdienst (German
1066 Meteorological Service).
1067 See L<http://de.wikipedia.org/wiki/Barometrische_H%C3%B6henformel#Theorie>
1068 For this method you have to configure both C<Altitude> and
1069 C<TemperatureSensor>.
1074 =item B<Altitude> I<altitude>
1076 The altitude (in meters) of the location where you meassure the pressure.
1078 =item B<TemperatureSensor> I<reference>
1080 Temperature sensor(s) which should be used as a reference when normalizing the
1081 pressure using C<Normalization> method 2.
1082 When specified more sensors a minimum is found and used each time. The
1083 temperature reading directly from this pressure sensor/plugin is typically not
1084 suitable as the pressure sensor will be probably inside while we want outside
1085 temperature. The collectd reference name is something like
1086 <hostname>/<plugin_name>-<plugin_instance>/<type>-<type_instance>
1087 (<type_instance> is usually omitted when there is just single value type). Or
1088 you can figure it out from the path of the output data files.
1092 =head2 Plugin C<battery>
1094 The I<battery plugin> reports the remaining capacity, power and voltage of
1099 =item B<ValuesPercentage> B<false>|B<true>
1101 When enabled, remaining capacity is reported as a percentage, e.g. "42%
1102 capacity remaining". Otherwise the capacity is stored as reported by the
1103 battery, most likely in "Wh". This option does not work with all input methods,
1104 in particular when only C</proc/pmu> is available on an old Linux system.
1105 Defaults to B<false>.
1107 =item B<ReportDegraded> B<false>|B<true>
1109 Typical laptop batteries degrade over time, meaning the capacity decreases with
1110 recharge cycles. The maximum charge of the previous charge cycle is tracked as
1111 "last full capacity" and used to determine that a battery is "fully charged".
1113 When this option is set to B<false>, the default, the I<battery plugin> will
1114 only report the remaining capacity. If the B<ValuesPercentage> option is
1115 enabled, the relative remaining capacity is calculated as the ratio of the
1116 "remaining capacity" and the "last full capacity". This is what most tools,
1117 such as the status bar of desktop environments, also do.
1119 When set to B<true>, the battery plugin will report three values: B<charged>
1120 (remaining capacity), B<discharged> (difference between "last full capacity"
1121 and "remaining capacity") and B<degraded> (difference between "design capacity"
1122 and "last full capacity").
1124 =item B<QueryStateFS> B<false>|B<true>
1126 When set to B<true>, the battery plugin will only read statistics
1127 related to battery performance as exposed by StateFS at
1128 /run/state. StateFS is used in Mer-based Sailfish OS, for
1133 =head2 Plugin C<bind>
1135 Starting with BIND 9.5.0, the most widely used DNS server software provides
1136 extensive statistics about queries, responses and lots of other information.
1137 The bind plugin retrieves this information that's encoded in XML and provided
1138 via HTTP and submits the values to collectd.
1140 To use this plugin, you first need to tell BIND to make this information
1141 available. This is done with the C<statistics-channels> configuration option:
1143 statistics-channels {
1144 inet localhost port 8053;
1147 The configuration follows the grouping that can be seen when looking at the
1148 data with an XSLT compatible viewer, such as a modern web browser. It's
1149 probably a good idea to make yourself familiar with the provided values, so you
1150 can understand what the collected statistics actually mean.
1155 URL "http://localhost:8053/"
1170 Zone "127.in-addr.arpa/IN"
1174 The bind plugin accepts the following configuration options:
1180 URL from which to retrieve the XML data. If not specified,
1181 C<http://localhost:8053/> will be used.
1183 =item B<ParseTime> B<true>|B<false>
1185 When set to B<true>, the time provided by BIND will be parsed and used to
1186 dispatch the values. When set to B<false>, the local time source is queried.
1188 This setting is set to B<true> by default for backwards compatibility; setting
1189 this to B<false> is I<recommended> to avoid problems with timezones and
1192 =item B<OpCodes> B<true>|B<false>
1194 When enabled, statistics about the I<"OpCodes">, for example the number of
1195 C<QUERY> packets, are collected.
1199 =item B<QTypes> B<true>|B<false>
1201 When enabled, the number of I<incoming> queries by query types (for example
1202 C<A>, C<MX>, C<AAAA>) is collected.
1206 =item B<ServerStats> B<true>|B<false>
1208 Collect global server statistics, such as requests received over IPv4 and IPv6,
1209 successful queries, and failed updates.
1213 =item B<ZoneMaintStats> B<true>|B<false>
1215 Collect zone maintenance statistics, mostly information about notifications
1216 (zone updates) and zone transfers.
1220 =item B<ResolverStats> B<true>|B<false>
1222 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
1223 (e.E<nbsp>g. queries over IPv4, lame servers). Since the global resolver
1224 counters apparently were removed in BIND 9.5.1 and 9.6.0, this is disabled by
1225 default. Use the B<ResolverStats> option within a B<View "_default"> block
1226 instead for the same functionality.
1230 =item B<MemoryStats>
1232 Collect global memory statistics.
1236 =item B<Timeout> I<Milliseconds>
1238 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
1239 milliseconds. By default, the configured B<Interval> is used to set the
1242 =item B<View> I<Name>
1244 Collect statistics about a specific I<"view">. BIND can behave different,
1245 mostly depending on the source IP-address of the request. These different
1246 configurations are called "views". If you don't use this feature, you most
1247 likely are only interested in the C<_default> view.
1249 Within a E<lt>B<View>E<nbsp>I<name>E<gt> block, you can specify which
1250 information you want to collect about a view. If no B<View> block is
1251 configured, no detailed view statistics will be collected.
1255 =item B<QTypes> B<true>|B<false>
1257 If enabled, the number of I<outgoing> queries by query type (e.E<nbsp>g. C<A>,
1258 C<MX>) is collected.
1262 =item B<ResolverStats> B<true>|B<false>
1264 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
1265 (e.E<nbsp>g. queries over IPv4, lame servers).
1269 =item B<CacheRRSets> B<true>|B<false>
1271 If enabled, the number of entries (I<"RR sets">) in the view's cache by query
1272 type is collected. Negative entries (queries which resulted in an error, for
1273 example names that do not exist) are reported with a leading exclamation mark,
1278 =item B<Zone> I<Name>
1280 When given, collect detailed information about the given zone in the view. The
1281 information collected if very similar to the global B<ServerStats> information
1284 You can repeat this option to collect detailed information about multiple
1287 By default no detailed zone information is collected.
1293 =head2 Plugin C<ceph>
1295 The ceph plugin collects values from JSON data to be parsed by B<libyajl>
1296 (L<https://lloyd.github.io/yajl/>) retrieved from ceph daemon admin sockets.
1298 A separate B<Daemon> block must be configured for each ceph daemon to be
1299 monitored. The following example will read daemon statistics from four
1300 separate ceph daemons running on the same device (two OSDs, one MON, one MDS) :
1303 LongRunAvgLatency false
1304 ConvertSpecialMetricTypes true
1306 SocketPath "/var/run/ceph/ceph-osd.0.asok"
1309 SocketPath "/var/run/ceph/ceph-osd.1.asok"
1312 SocketPath "/var/run/ceph/ceph-mon.ceph1.asok"
1315 SocketPath "/var/run/ceph/ceph-mds.ceph1.asok"
1319 The ceph plugin accepts the following configuration options:
1323 =item B<LongRunAvgLatency> B<true>|B<false>
1325 If enabled, latency values(sum,count pairs) are calculated as the long run
1326 average - average since the ceph daemon was started = (sum / count).
1327 When disabled, latency values are calculated as the average since the last
1328 collection = (sum_now - sum_last) / (count_now - count_last).
1332 =item B<ConvertSpecialMetricTypes> B<true>|B<false>
1334 If enabled, special metrics (metrics that differ in type from similar counters)
1335 are converted to the type of those similar counters. This currently only
1336 applies to filestore.journal_wr_bytes which is a counter for OSD daemons. The
1337 ceph schema reports this metric type as a sum,count pair while similar counters
1338 are treated as derive types. When converted, the sum is used as the counter
1339 value and is treated as a derive type.
1340 When disabled, all metrics are treated as the types received from the ceph schema.
1346 Each B<Daemon> block must have a string argument for the plugin instance name.
1347 A B<SocketPath> is also required for each B<Daemon> block:
1351 =item B<Daemon> I<DaemonName>
1353 Name to be used as the instance name for this daemon.
1355 =item B<SocketPath> I<SocketPath>
1357 Specifies the path to the UNIX admin socket of the ceph daemon.
1361 =head2 Plugin C<cgroups>
1363 This plugin collects the CPU user/system time for each I<cgroup> by reading the
1364 F<cpuacct.stat> files in the first cpuacct-mountpoint (typically
1365 F</sys/fs/cgroup/cpu.cpuacct> on machines using systemd).
1369 =item B<CGroup> I<Directory>
1371 Select I<cgroup> based on the name. Whether only matching I<cgroups> are
1372 collected or if they are ignored is controlled by the B<IgnoreSelected> option;
1375 See F</"IGNORELISTS"> for details.
1377 =item B<IgnoreSelected> B<true>|B<false>
1379 Invert the selection: If set to true, all cgroups I<except> the ones that
1380 match any one of the criteria are collected. By default only selected
1381 cgroups are collected if a selection is made. If no selection is configured
1382 at all, B<all> cgroups are selected.
1386 =head2 Plugin C<chrony>
1388 The C<chrony> plugin collects ntp data from a B<chronyd> server, such as clock
1389 skew and per-peer stratum.
1391 For talking to B<chronyd>, it mimics what the B<chronyc> control program does
1394 Available configuration options for the C<chrony> plugin:
1398 =item B<Host> I<Hostname>
1400 Hostname of the host running B<chronyd>. Defaults to B<localhost>.
1402 =item B<Port> I<Port>
1404 UDP-Port to connect to. Defaults to B<323>.
1406 =item B<Timeout> I<Timeout>
1408 Connection timeout in seconds. Defaults to B<2>.
1412 =head2 Plugin C<conntrack>
1414 This plugin collects IP conntrack statistics.
1420 Assume the B<conntrack_count> and B<conntrack_max> files to be found in
1421 F</proc/sys/net/ipv4/netfilter> instead of F</proc/sys/net/netfilter/>.
1425 =head2 Plugin C<cpu>
1427 The I<CPU plugin> collects CPU usage metrics. By default, CPU usage is reported
1428 as Jiffies, using the C<cpu> type. Two aggregations are available:
1434 Sum, per-state, over all CPUs installed in the system; and
1438 Sum, per-CPU, over all non-idle states of a CPU, creating an "active" state.
1442 The two aggregations can be combined, leading to I<collectd> only emitting a
1443 single "active" metric for the entire system. As soon as one of these
1444 aggregations (or both) is enabled, the I<cpu plugin> will report a percentage,
1445 rather than Jiffies. In addition, you can request individual, per-state,
1446 per-CPU metrics to be reported as percentage.
1448 The following configuration options are available:
1452 =item B<ReportByState> B<true>|B<false>
1454 When set to B<true>, the default, reports per-state metrics, e.g. "system",
1456 When set to B<false>, aggregates (sums) all I<non-idle> states into one
1459 =item B<ReportByCpu> B<true>|B<false>
1461 When set to B<true>, the default, reports per-CPU (per-core) metrics.
1462 When set to B<false>, instead of reporting metrics for individual CPUs, only a
1463 global sum of CPU states is emitted.
1465 =item B<ValuesPercentage> B<false>|B<true>
1467 This option is only considered when both, B<ReportByCpu> and B<ReportByState>
1468 are set to B<true>. In this case, by default, metrics will be reported as
1469 Jiffies. By setting this option to B<true>, you can request percentage values
1470 in the un-aggregated (per-CPU, per-state) mode as well.
1472 =item B<ReportNumCpu> B<false>|B<true>
1474 When set to B<true>, reports the number of available CPUs.
1475 Defaults to B<false>.
1479 =head2 Plugin C<cpufreq>
1481 This plugin doesn't have any options. It reads
1482 F</sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq> (for the first CPU
1483 installed) to get the current CPU frequency. If this file does not exist make
1484 sure B<cpufreqd> (L<http://cpufreqd.sourceforge.net/>) or a similar tool is
1485 installed and an "cpu governor" (that's a kernel module) is loaded.
1487 =head2 Plugin C<cpusleep>
1489 This plugin doesn't have any options. It reads CLOCK_BOOTTIME and
1490 CLOCK_MONOTONIC and reports the difference between these clocks. Since
1491 BOOTTIME clock increments while device is suspended and MONOTONIC
1492 clock does not, the derivative of the difference between these clocks
1493 gives the relative amount of time the device has spent in suspend
1494 state. The recorded value is in milliseconds of sleep per seconds of
1497 =head2 Plugin C<csv>
1501 =item B<DataDir> I<Directory>
1503 Set the directory to store CSV-files under. Per default CSV-files are generated
1504 beneath the daemon's working directory, i.E<nbsp>e. the B<BaseDir>.
1505 The special strings B<stdout> and B<stderr> can be used to write to the standard
1506 output and standard error channels, respectively. This, of course, only makes
1507 much sense when collectd is running in foreground- or non-daemon-mode.
1509 =item B<StoreRates> B<true|false>
1511 If set to B<true>, convert counter values to rates. If set to B<false> (the
1512 default) counter values are stored as is, i.E<nbsp>e. as an increasing integer
1517 =head2 cURL Statistics
1519 All cURL-based plugins support collection of generic, request-based
1520 statistics. These are disabled by default and can be enabled selectively for
1521 each page or URL queried from the curl, curl_json, or curl_xml plugins. See
1522 the documentation of those plugins for specific information. This section
1523 describes the available metrics that can be configured for each plugin. All
1524 options are disabled by default.
1526 See L<http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html> for more details.
1530 =item B<TotalTime> B<true|false>
1532 Total time of the transfer, including name resolving, TCP connect, etc.
1534 =item B<NamelookupTime> B<true|false>
1536 Time it took from the start until name resolving was completed.
1538 =item B<ConnectTime> B<true|false>
1540 Time it took from the start until the connect to the remote host (or proxy)
1543 =item B<AppconnectTime> B<true|false>
1545 Time it took from the start until the SSL/SSH connect/handshake to the remote
1548 =item B<PretransferTime> B<true|false>
1550 Time it took from the start until just before the transfer begins.
1552 =item B<StarttransferTime> B<true|false>
1554 Time it took from the start until the first byte was received.
1556 =item B<RedirectTime> B<true|false>
1558 Time it took for all redirection steps include name lookup, connect,
1559 pre-transfer and transfer before final transaction was started.
1561 =item B<RedirectCount> B<true|false>
1563 The total number of redirections that were actually followed.
1565 =item B<SizeUpload> B<true|false>
1567 The total amount of bytes that were uploaded.
1569 =item B<SizeDownload> B<true|false>
1571 The total amount of bytes that were downloaded.
1573 =item B<SpeedDownload> B<true|false>
1575 The average download speed that curl measured for the complete download.
1577 =item B<SpeedUpload> B<true|false>
1579 The average upload speed that curl measured for the complete upload.
1581 =item B<HeaderSize> B<true|false>
1583 The total size of all the headers received.
1585 =item B<RequestSize> B<true|false>
1587 The total size of the issued requests.
1589 =item B<ContentLengthDownload> B<true|false>
1591 The content-length of the download.
1593 =item B<ContentLengthUpload> B<true|false>
1595 The specified size of the upload.
1597 =item B<NumConnects> B<true|false>
1599 The number of new connections that were created to achieve the transfer.
1603 =head2 Plugin C<curl>
1605 The curl plugin uses the B<libcurl> (L<http://curl.haxx.se/>) to read web pages
1606 and the match infrastructure (the same code used by the tail plugin) to use
1607 regular expressions with the received data.
1609 The following example will read the current value of AMD stock from Google's
1610 finance page and dispatch the value to collectd.
1613 <Page "stock_quotes">
1614 URL "http://finance.google.com/finance?q=NYSE%3AAMD"
1620 CACert "/path/to/ca.crt"
1621 Header "X-Custom-Header: foobar"
1624 MeasureResponseTime false
1625 MeasureResponseCode false
1628 Regex "<span +class=\"pr\"[^>]*> *([0-9]*\\.[0-9]+) *</span>"
1629 DSType "GaugeAverage"
1630 # Note: `stock_value' is not a standard type.
1637 In the B<Plugin> block, there may be one or more B<Page> blocks, each defining
1638 a web page and one or more "matches" to be performed on the returned data. The
1639 string argument to the B<Page> block is used as plugin instance.
1641 The following options are valid within B<Page> blocks:
1647 URL of the web site to retrieve. Since a regular expression will be used to
1648 extract information from this data, non-binary data is a big plus here ;)
1650 =item B<User> I<Name>
1652 Username to use if authorization is required to read the page.
1654 =item B<Password> I<Password>
1656 Password to use if authorization is required to read the page.
1658 =item B<Digest> B<true>|B<false>
1660 Enable HTTP digest authentication.
1662 =item B<VerifyPeer> B<true>|B<false>
1664 Enable or disable peer SSL certificate verification. See
1665 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
1667 =item B<VerifyHost> B<true>|B<false>
1669 Enable or disable peer host name verification. If enabled, the plugin checks if
1670 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
1671 matches the host name provided by the B<URL> option. If this identity check
1672 fails, the connection is aborted. Obviously, only works when connecting to a
1673 SSL enabled server. Enabled by default.
1675 =item B<CACert> I<file>
1677 File that holds one or more SSL certificates. If you want to use HTTPS you will
1678 possibly need this option. What CA certificates come bundled with C<libcurl>
1679 and are checked by default depends on the distribution you use.
1681 =item B<Header> I<Header>
1683 A HTTP header to add to the request. Multiple headers are added if this option
1684 is specified more than once.
1686 =item B<Post> I<Body>
1688 Specifies that the HTTP operation should be a POST instead of a GET. The
1689 complete data to be posted is given as the argument. This option will usually
1690 need to be accompanied by a B<Header> option to set an appropriate
1691 C<Content-Type> for the post body (e.g. to
1692 C<application/x-www-form-urlencoded>).
1694 =item B<MeasureResponseTime> B<true>|B<false>
1696 Measure response time for the request. If this setting is enabled, B<Match>
1697 blocks (see below) are optional. Disabled by default.
1699 Beware that requests will get aborted if they take too long to complete. Adjust
1700 B<Timeout> accordingly if you expect B<MeasureResponseTime> to report such slow
1703 This option is similar to enabling the B<TotalTime> statistic but it's
1704 measured by collectd instead of cURL.
1706 =item B<MeasureResponseCode> B<true>|B<false>
1708 Measure response code for the request. If this setting is enabled, B<Match>
1709 blocks (see below) are optional. Disabled by default.
1711 =item B<E<lt>StatisticsE<gt>>
1713 One B<Statistics> block can be used to specify cURL statistics to be collected
1714 for each request to the remote web site. See the section "cURL Statistics"
1715 above for details. If this setting is enabled, B<Match> blocks (see below) are
1718 =item B<E<lt>MatchE<gt>>
1720 One or more B<Match> blocks that define how to match information in the data
1721 returned by C<libcurl>. The C<curl> plugin uses the same infrastructure that's
1722 used by the C<tail> plugin, so please see the documentation of the C<tail>
1723 plugin below on how matches are defined. If the B<MeasureResponseTime> or
1724 B<MeasureResponseCode> options are set to B<true>, B<Match> blocks are
1727 =item B<Timeout> I<Milliseconds>
1729 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
1730 milliseconds. By default, the configured B<Interval> is used to set the
1731 timeout. Prior to version 5.5.0, there was no timeout and requests could hang
1732 indefinitely. This legacy behaviour can be achieved by setting the value of
1735 If B<Timeout> is 0 or bigger than the B<Interval>, keep in mind that each slow
1736 network connection will stall one read thread. Adjust the B<ReadThreads> global
1737 setting accordingly to prevent this from blocking other plugins.
1741 =head2 Plugin C<curl_json>
1743 The B<curl_json plugin> collects values from JSON data to be parsed by
1744 B<libyajl> (L<https://lloyd.github.io/yajl/>) retrieved via
1745 either B<libcurl> (L<http://curl.haxx.se/>) or read directly from a
1746 unix socket. The former can be used, for example, to collect values
1747 from CouchDB documents (which are stored JSON notation), and the
1748 latter to collect values from a uWSGI stats socket.
1750 The following example will collect several values from the built-in
1751 C<_stats> runtime statistics module of I<CouchDB>
1752 (L<http://wiki.apache.org/couchdb/Runtime_Statistics>).
1755 <URL "http://localhost:5984/_stats">
1757 <Key "httpd/requests/count">
1758 Type "http_requests"
1761 <Key "httpd_request_methods/*/count">
1762 Type "http_request_methods"
1765 <Key "httpd_status_codes/*/count">
1766 Type "http_response_codes"
1771 This example will collect data directly from a I<uWSGI> "Stats Server" socket.
1774 <Sock "/var/run/uwsgi.stats.sock">
1776 <Key "workers/*/requests">
1777 Type "http_requests"
1780 <Key "workers/*/apps/*/requests">
1781 Type "http_requests"
1786 In the B<Plugin> block, there may be one or more B<URL> blocks, each
1787 defining a URL to be fetched via HTTP (using libcurl) or B<Sock>
1788 blocks defining a unix socket to read JSON from directly. Each of
1789 these blocks may have one or more B<Key> blocks.
1791 The B<Key> string argument must be in a path format. Each component is
1792 used to match the key from a JSON map or the index of an JSON
1793 array. If a path component of a B<Key> is a I<*>E<nbsp>wildcard, the
1794 values for all map keys or array indices will be collectd.
1796 The following options are valid within B<URL> blocks:
1800 =item B<Host> I<Name>
1802 Use I<Name> as the host name when submitting values. Defaults to the global
1805 =item B<Instance> I<Instance>
1807 Sets the plugin instance to I<Instance>.
1809 =item B<Interval> I<Interval>
1811 Sets the interval (in seconds) in which the values will be collected from this
1812 URL. By default the global B<Interval> setting will be used.
1814 =item B<User> I<Name>
1816 =item B<Password> I<Password>
1818 =item B<Digest> B<true>|B<false>
1820 =item B<VerifyPeer> B<true>|B<false>
1822 =item B<VerifyHost> B<true>|B<false>
1824 =item B<CACert> I<file>
1826 =item B<Header> I<Header>
1828 =item B<Post> I<Body>
1830 =item B<Timeout> I<Milliseconds>
1832 These options behave exactly equivalent to the appropriate options of the
1833 I<cURL> plugin. Please see there for a detailed description.
1835 =item B<E<lt>StatisticsE<gt>>
1837 One B<Statistics> block can be used to specify cURL statistics to be collected
1838 for each request to the remote URL. See the section "cURL Statistics" above
1843 The following options are valid within B<Key> blocks:
1847 =item B<Type> I<Type>
1849 Sets the type used to dispatch the values to the daemon. Detailed information
1850 about types and their configuration can be found in L<types.db(5)>. This
1851 option is mandatory.
1853 =item B<Instance> I<Instance>
1855 Type-instance to use. Defaults to the current map key or current string array element value.
1859 =head2 Plugin C<curl_xml>
1861 The B<curl_xml plugin> uses B<libcurl> (L<http://curl.haxx.se/>) and B<libxml2>
1862 (L<http://xmlsoft.org/>) to retrieve XML data via cURL.
1865 <URL "http://localhost/stats.xml">
1867 Instance "some_instance"
1872 CACert "/path/to/ca.crt"
1873 Header "X-Custom-Header: foobar"
1876 <XPath "table[@id=\"magic_level\"]/tr">
1878 #InstancePrefix "prefix-"
1879 InstanceFrom "td[1]"
1880 ValuesFrom "td[2]/span[@class=\"level\"]"
1885 In the B<Plugin> block, there may be one or more B<URL> blocks, each defining a
1886 URL to be fetched using libcurl. Within each B<URL> block there are
1887 options which specify the connection parameters, for example authentication
1888 information, and one or more B<XPath> blocks.
1890 Each B<XPath> block specifies how to get one type of information. The
1891 string argument must be a valid XPath expression which returns a list
1892 of "base elements". One value is dispatched for each "base element". The
1893 I<type instance> and values are looked up using further I<XPath> expressions
1894 that should be relative to the base element.
1896 Within the B<URL> block the following options are accepted:
1900 =item B<Host> I<Name>
1902 Use I<Name> as the host name when submitting values. Defaults to the global
1905 =item B<Instance> I<Instance>
1907 Use I<Instance> as the plugin instance when submitting values. Defaults to an
1908 empty string (no plugin instance).
1910 =item B<Namespace> I<Prefix> I<URL>
1912 If an XPath expression references namespaces, they must be specified
1913 with this option. I<Prefix> is the "namespace prefix" used in the XML document.
1914 I<URL> is the "namespace name", an URI reference uniquely identifying the
1915 namespace. The option can be repeated to register multiple namespaces.
1919 Namespace "s" "http://schemas.xmlsoap.org/soap/envelope/"
1920 Namespace "m" "http://www.w3.org/1998/Math/MathML"
1922 =item B<User> I<User>
1924 =item B<Password> I<Password>
1926 =item B<Digest> B<true>|B<false>
1928 =item B<VerifyPeer> B<true>|B<false>
1930 =item B<VerifyHost> B<true>|B<false>
1932 =item B<CACert> I<CA Cert File>
1934 =item B<Header> I<Header>
1936 =item B<Post> I<Body>
1938 =item B<Timeout> I<Milliseconds>
1940 These options behave exactly equivalent to the appropriate options of the
1941 I<cURL plugin>. Please see there for a detailed description.
1943 =item B<E<lt>StatisticsE<gt>>
1945 One B<Statistics> block can be used to specify cURL statistics to be collected
1946 for each request to the remote URL. See the section "cURL Statistics" above
1949 =item E<lt>B<XPath> I<XPath-expression>E<gt>
1951 Within each B<URL> block, there must be one or more B<XPath> blocks. Each
1952 B<XPath> block specifies how to get one type of information. The string
1953 argument must be a valid XPath expression which returns a list of "base
1954 elements". One value is dispatched for each "base element".
1956 Within the B<XPath> block the following options are accepted:
1960 =item B<Type> I<Type>
1962 Specifies the I<Type> used for submitting patches. This determines the number
1963 of values that are required / expected and whether the strings are parsed as
1964 signed or unsigned integer or as double values. See L<types.db(5)> for details.
1965 This option is required.
1967 =item B<InstancePrefix> I<InstancePrefix>
1969 Prefix the I<type instance> with I<InstancePrefix>. The values are simply
1970 concatenated together without any separator.
1971 This option is optional.
1973 =item B<InstanceFrom> I<InstanceFrom>
1975 Specifies a XPath expression to use for determining the I<type instance>. The
1976 XPath expression must return exactly one element. The element's value is then
1977 used as I<type instance>, possibly prefixed with I<InstancePrefix> (see above).
1979 This value is required. As a special exception, if the "base XPath expression"
1980 (the argument to the B<XPath> block) returns exactly one argument, then this
1981 option may be omitted.
1983 =item B<ValuesFrom> I<ValuesFrom> [I<ValuesFrom> ...]
1985 Specifies one or more XPath expression to use for reading the values. The
1986 number of XPath expressions must match the number of data sources in the
1987 I<type> specified with B<Type> (see above). Each XPath expression must return
1988 exactly one element. The element's value is then parsed as a number and used as
1989 value for the appropriate value in the value list dispatched to the daemon.
1995 =head2 Plugin C<dbi>
1997 This plugin uses the B<dbi> library (L<http://libdbi.sourceforge.net/>) to
1998 connect to various databases, execute I<SQL> statements and read back the
1999 results. I<dbi> is an acronym for "database interface" in case you were
2000 wondering about the name. You can configure how each column is to be
2001 interpreted and the plugin will generate one or more data sets from each row
2002 returned according to these rules.
2004 Because the plugin is very generic, the configuration is a little more complex
2005 than those of other plugins. It usually looks something like this:
2008 <Query "out_of_stock">
2009 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
2010 # Use with MySQL 5.0.0 or later
2014 InstancePrefix "out_of_stock"
2015 InstancesFrom "category"
2019 <Database "product_information">
2022 DriverOption "host" "localhost"
2023 DriverOption "username" "collectd"
2024 DriverOption "password" "aZo6daiw"
2025 DriverOption "dbname" "prod_info"
2026 SelectDB "prod_info"
2027 Query "out_of_stock"
2031 The configuration above defines one query with one result and one database. The
2032 query is then linked to the database with the B<Query> option I<within> the
2033 B<E<lt>DatabaseE<gt>> block. You can have any number of queries and databases
2034 and you can also use the B<Include> statement to split up the configuration
2035 file in multiple, smaller files. However, the B<E<lt>QueryE<gt>> block I<must>
2036 precede the B<E<lt>DatabaseE<gt>> blocks, because the file is interpreted from
2039 The following is a complete list of options:
2041 =head3 B<Query> blocks
2043 Query blocks define I<SQL> statements and how the returned data should be
2044 interpreted. They are identified by the name that is given in the opening line
2045 of the block. Thus the name needs to be unique. Other than that, the name is
2046 not used in collectd.
2048 In each B<Query> block, there is one or more B<Result> blocks. B<Result> blocks
2049 define which column holds which value or instance information. You can use
2050 multiple B<Result> blocks to create multiple values from one returned row. This
2051 is especially useful, when queries take a long time and sending almost the same
2052 query again and again is not desirable.
2056 <Query "environment">
2057 Statement "select station, temperature, humidity from environment"
2060 # InstancePrefix "foo"
2061 InstancesFrom "station"
2062 ValuesFrom "temperature"
2066 InstancesFrom "station"
2067 ValuesFrom "humidity"
2071 The following options are accepted:
2075 =item B<Statement> I<SQL>
2077 Sets the statement that should be executed on the server. This is B<not>
2078 interpreted by collectd, but simply passed to the database server. Therefore,
2079 the SQL dialect that's used depends on the server collectd is connected to.
2081 The query has to return at least two columns, one for the instance and one
2082 value. You cannot omit the instance, even if the statement is guaranteed to
2083 always return exactly one line. In that case, you can usually specify something
2086 Statement "SELECT \"instance\", COUNT(*) AS value FROM table"
2088 (That works with MySQL but may not be valid SQL according to the spec. If you
2089 use a more strict database server, you may have to select from a dummy table or
2092 Please note that some databases, for example B<Oracle>, will fail if you
2093 include a semicolon at the end of the statement.
2095 =item B<MinVersion> I<Version>
2097 =item B<MaxVersion> I<Value>
2099 Only use this query for the specified database version. You can use these
2100 options to provide multiple queries with the same name but with a slightly
2101 different syntax. The plugin will use only those queries, where the specified
2102 minimum and maximum versions fit the version of the database in use.
2104 The database version is determined by C<dbi_conn_get_engine_version>, see the
2105 L<libdbi documentation|http://libdbi.sourceforge.net/docs/programmers-guide/reference-conn.html#DBI-CONN-GET-ENGINE-VERSION>
2106 for details. Basically, each part of the version is assumed to be in the range
2107 from B<00> to B<99> and all dots are removed. So version "4.1.2" becomes
2108 "40102", version "5.0.42" becomes "50042".
2110 B<Warning:> The plugin will use B<all> matching queries, so if you specify
2111 multiple queries with the same name and B<overlapping> ranges, weird stuff will
2112 happen. Don't to it! A valid example would be something along these lines:
2123 In the above example, there are three ranges that don't overlap. The last one
2124 goes from version "5.1.0" to infinity, meaning "all later versions". Versions
2125 before "4.0.0" are not specified.
2127 =item B<Type> I<Type>
2129 The B<type> that's used for each line returned. See L<types.db(5)> for more
2130 details on how types are defined. In short: A type is a predefined layout of
2131 data and the number of values and type of values has to match the type
2134 If you specify "temperature" here, you need exactly one gauge column. If you
2135 specify "if_octets", you will need two counter columns. See the B<ValuesFrom>
2138 There must be exactly one B<Type> option inside each B<Result> block.
2140 =item B<InstancePrefix> I<prefix>
2142 Prepends I<prefix> to the type instance. If B<InstancesFrom> (see below) is not
2143 given, the string is simply copied. If B<InstancesFrom> is given, I<prefix> and
2144 all strings returned in the appropriate columns are concatenated together,
2145 separated by dashes I<("-")>.
2147 =item B<InstancesFrom> I<column0> [I<column1> ...]
2149 Specifies the columns whose values will be used to create the "type-instance"
2150 for each row. If you specify more than one column, the value of all columns
2151 will be joined together with dashes I<("-")> as separation characters.
2153 The plugin itself does not check whether or not all built instances are
2154 different. It's your responsibility to assure that each is unique. This is
2155 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
2156 sure that only one row is returned in this case.
2158 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type-instance
2161 =item B<ValuesFrom> I<column0> [I<column1> ...]
2163 Names the columns whose content is used as the actual data for the data sets
2164 that are dispatched to the daemon. How many such columns you need is determined
2165 by the B<Type> setting above. If you specify too many or not enough columns,
2166 the plugin will complain about that and no data will be submitted to the
2169 The actual data type in the columns is not that important. The plugin will
2170 automatically cast the values to the right type if it know how to do that. So
2171 it should be able to handle integer an floating point types, as well as strings
2172 (if they include a number at the beginning).
2174 There must be at least one B<ValuesFrom> option inside each B<Result> block.
2176 =item B<MetadataFrom> [I<column0> I<column1> ...]
2178 Names the columns whose content is used as metadata for the data sets
2179 that are dispatched to the daemon.
2181 The actual data type in the columns is not that important. The plugin will
2182 automatically cast the values to the right type if it know how to do that. So
2183 it should be able to handle integer an floating point types, as well as strings
2184 (if they include a number at the beginning).
2188 =head3 B<Database> blocks
2190 Database blocks define a connection to a database and which queries should be
2191 sent to that database. Since the used "dbi" library can handle a wide variety
2192 of databases, the configuration is very generic. If in doubt, refer to libdbi's
2193 documentationE<nbsp>- we stick as close to the terminology used there.
2195 Each database needs a "name" as string argument in the starting tag of the
2196 block. This name will be used as "PluginInstance" in the values submitted to
2197 the daemon. Other than that, that name is not used.
2201 =item B<Interval> I<Interval>
2203 Sets the interval (in seconds) in which the values will be collected from this
2204 database. By default the global B<Interval> setting will be used.
2206 =item B<Driver> I<Driver>
2208 Specifies the driver to use to connect to the database. In many cases those
2209 drivers are named after the database they can connect to, but this is not a
2210 technical necessity. These drivers are sometimes referred to as "DBD",
2211 B<D>ataB<B>ase B<D>river, and some distributions ship them in separate
2212 packages. Drivers for the "dbi" library are developed by the B<libdbi-drivers>
2213 project at L<http://libdbi-drivers.sourceforge.net/>.
2215 You need to give the driver name as expected by the "dbi" library here. You
2216 should be able to find that in the documentation for each driver. If you
2217 mistype the driver name, the plugin will dump a list of all known driver names
2220 =item B<DriverOption> I<Key> I<Value>
2222 Sets driver-specific options. What option a driver supports can be found in the
2223 documentation for each driver, somewhere at
2224 L<http://libdbi-drivers.sourceforge.net/>. However, the options "host",
2225 "username", "password", and "dbname" seem to be deE<nbsp>facto standards.
2227 DBDs can register two types of options: String options and numeric options. The
2228 plugin will use the C<dbi_conn_set_option> function when the configuration
2229 provides a string and the C<dbi_conn_require_option_numeric> function when the
2230 configuration provides a number. So these two lines will actually result in
2231 different calls being used:
2233 DriverOption "Port" 1234 # numeric
2234 DriverOption "Port" "1234" # string
2236 Unfortunately, drivers are not too keen to report errors when an unknown option
2237 is passed to them, so invalid settings here may go unnoticed. This is not the
2238 plugin's fault, it will report errors if it gets them from the libraryE<nbsp>/
2239 the driver. If a driver complains about an option, the plugin will dump a
2240 complete list of all options understood by that driver to the log. There is no
2241 way to programmatically find out if an option expects a string or a numeric
2242 argument, so you will have to refer to the appropriate DBD's documentation to
2243 find this out. Sorry.
2245 =item B<SelectDB> I<Database>
2247 In some cases, the database name you connect with is not the database name you
2248 want to use for querying data. If this option is set, the plugin will "select"
2249 (switch to) that database after the connection is established.
2251 =item B<Query> I<QueryName>
2253 Associates the query named I<QueryName> with this database connection. The
2254 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
2255 blocks you want to refer to must be placed above the database block you want to
2258 =item B<Host> I<Hostname>
2260 Sets the B<host> field of I<value lists> to I<Hostname> when dispatching
2261 values. Defaults to the global hostname setting.
2269 =item B<Device> I<Device>
2271 Select partitions based on the devicename.
2273 See F</"IGNORELISTS"> for details.
2275 =item B<MountPoint> I<Directory>
2277 Select partitions based on the mountpoint.
2279 See F</"IGNORELISTS"> for details.
2281 =item B<FSType> I<FSType>
2283 Select partitions based on the filesystem type.
2285 See F</"IGNORELISTS"> for details.
2287 =item B<IgnoreSelected> B<true>|B<false>
2289 Invert the selection: If set to true, all partitions B<except> the ones that
2290 match any one of the criteria are collected. By default only selected
2291 partitions are collected if a selection is made. If no selection is configured
2292 at all, B<all> partitions are selected.
2294 =item B<ReportByDevice> B<true>|B<false>
2296 Report using the device name rather than the mountpoint. i.e. with this I<false>,
2297 (the default), it will report a disk as "root", but with it I<true>, it will be
2298 "sda1" (or whichever).
2300 =item B<ReportInodes> B<true>|B<false>
2302 Enables or disables reporting of free, reserved and used inodes. Defaults to
2303 inode collection being disabled.
2305 Enable this option if inodes are a scarce resource for you, usually because
2306 many small files are stored on the disk. This is a usual scenario for mail
2307 transfer agents and web caches.
2309 =item B<ValuesAbsolute> B<true>|B<false>
2311 Enables or disables reporting of free and used disk space in 1K-blocks.
2312 Defaults to B<true>.
2314 =item B<ValuesPercentage> B<false>|B<true>
2316 Enables or disables reporting of free and used disk space in percentage.
2317 Defaults to B<false>.
2319 This is useful for deploying I<collectd> on the cloud, where machines with
2320 different disk size may exist. Then it is more practical to configure
2321 thresholds based on relative disk size.
2325 =head2 Plugin C<disk>
2327 The C<disk> plugin collects information about the usage of physical disks and
2328 logical disks (partitions). Values collected are the number of octets written
2329 to and read from a disk or partition, the number of read/write operations
2330 issued to the disk and a rather complex "time" it took for these commands to be
2333 Using the following two options you can ignore some disks or configure the
2334 collection only of specific disks.
2338 =item B<Disk> I<Name>
2340 Select the disk I<Name>. Whether it is collected or ignored depends on the
2341 B<IgnoreSelected> setting, see below. As with other plugins that use the
2342 daemon's ignorelist functionality, a string that starts and ends with a slash
2343 is interpreted as a regular expression. Examples:
2348 See F</"IGNORELISTS"> for details.
2350 =item B<IgnoreSelected> B<true>|B<false>
2352 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
2353 statements, are ignored or if all other disks are ignored. The behavior
2354 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
2355 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
2356 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
2357 is set to B<true>, all disks are collected B<except> the ones matched.
2359 =item B<UseBSDName> B<true>|B<false>
2361 Whether to use the device's "BSD Name", on MacE<nbsp>OSE<nbsp>X, instead of the
2362 default major/minor numbers. Requires collectd to be built with Apple's
2365 =item B<UdevNameAttr> I<Attribute>
2367 Attempt to override disk instance name with the value of a specified udev
2368 attribute when built with B<libudev>. If the attribute is not defined for the
2369 given device, the default name is used. Example:
2371 UdevNameAttr "DM_NAME"
2375 =head2 Plugin C<dns>
2379 =item B<Interface> I<Interface>
2381 The dns plugin uses B<libpcap> to capture dns traffic and analyzes it. This
2382 option sets the interface that should be used. If this option is not set, or
2383 set to "any", the plugin will try to get packets from B<all> interfaces. This
2384 may not work on certain platforms, such as MacE<nbsp>OSE<nbsp>X.
2386 =item B<IgnoreSource> I<IP-address>
2388 Ignore packets that originate from this address.
2390 =item B<SelectNumericQueryTypes> B<true>|B<false>
2392 Enabled by default, collects unknown (and thus presented as numeric only) query types.
2396 =head2 Plugin C<dpdkevents>
2398 The I<dpdkevents plugin> collects events from DPDK such as link status of
2399 network ports and Keep Alive status of DPDK logical cores.
2400 In order to get Keep Alive events following requirements must be met:
2402 - support for Keep Alive implemented in DPDK application. More details can
2403 be found here: http://dpdk.org/doc/guides/sample_app_ug/keep_alive.html
2407 <Plugin "dpdkevents">
2413 <Event "link_status">
2414 SendEventsOnUpdate true
2415 EnabledPortMask 0xffff
2416 PortName "interface1"
2417 PortName "interface2"
2418 SendNotification false
2420 <Event "keep_alive">
2421 SendEventsOnUpdate true
2423 KeepAliveShmName "/dpdk_keepalive_shm_name"
2424 SendNotification false
2431 =head3 The EAL block
2435 =item B<Coremask> I<Mask>
2437 =item B<Memorychannels> I<Channels>
2439 Number of memory channels per processor socket.
2441 =item B<FilePrefix> I<File>
2443 The prefix text used for hugepage filenames. The filename will be set to
2444 /var/run/.<prefix>_config where prefix is what is passed in by the user.
2448 =head3 The Event block
2450 The B<Event> block defines configuration for specific event. It accepts a
2451 single argument which specifies the name of the event.
2453 =head4 Link Status event
2457 =item B<SendEventOnUpdate> I<true|false>
2459 If set to true link status value will be dispatched only when it is
2460 different from previously read value. This is an optional argument - default
2463 =item B<EnabledPortMask> I<Mask>
2465 A hexidecimal bit mask of the DPDK ports which should be enabled. A mask
2466 of 0x0 means that all ports will be disabled. A bitmask of all F's means
2467 that all ports will be enabled. This is an optional argument - by default
2468 all ports are enabled.
2470 =item B<PortName> I<Name>
2472 A string containing an optional name for the enabled DPDK ports. Each PortName
2473 option should contain only one port name; specify as many PortName options as
2474 desired. Default naming convention will be used if PortName is blank. If there
2475 are less PortName options than there are enabled ports, the default naming
2476 convention will be used for the additional ports.
2478 =item B<SendNotification> I<true|false>
2480 If set to true, link status notifications are sent, instead of link status
2481 being collected as a statistic. This is an optional argument - default
2486 =head4 Keep Alive event
2490 =item B<SendEventOnUpdate> I<true|false>
2492 If set to true keep alive value will be dispatched only when it is
2493 different from previously read value. This is an optional argument - default
2496 =item B<LCoreMask> I<Mask>
2498 An hexadecimal bit mask of the logical cores to monitor keep alive state.
2500 =item B<KeepAliveShmName> I<Name>
2502 Shared memory name identifier that is used by secondary process to monitor
2503 the keep alive cores state.
2505 =item B<SendNotification> I<true|false>
2507 If set to true, keep alive notifications are sent, instead of keep alive
2508 information being collected as a statistic. This is an optional
2509 argument - default value is false.
2513 =head2 Plugin C<dpdkstat>
2515 The I<dpdkstat plugin> collects information about DPDK interfaces using the
2516 extended NIC stats API in DPDK.
2527 SharedMemObj "dpdk_collectd_stats_0"
2528 EnabledPortMask 0xffff
2529 PortName "interface1"
2530 PortName "interface2"
2535 =head3 The EAL block
2539 =item B<Coremask> I<Mask>
2541 A string containing an hexadecimal bit mask of the cores to run on. Note that
2542 core numbering can change between platforms and should be determined beforehand.
2544 =item B<Memorychannels> I<Channels>
2546 A string containing a number of memory channels per processor socket.
2548 =item B<FilePrefix> I<File>
2550 The prefix text used for hugepage filenames. The filename will be set to
2551 /var/run/.<prefix>_config where prefix is what is passed in by the user.
2553 =item B<SocketMemory> I<MB>
2555 A string containing amount of Memory to allocate from hugepages on specific
2556 sockets in MB. This is an optional value.
2562 =item B<SharedMemObj> I<Mask>
2564 A string containing the name of the shared memory object that should be used to
2565 share stats from the DPDK secondary process to the collectd dpdkstat plugin.
2566 Defaults to dpdk_collectd_stats if no other value is configured.
2568 =item B<EnabledPortMask> I<Mask>
2570 A hexidecimal bit mask of the DPDK ports which should be enabled. A mask
2571 of 0x0 means that all ports will be disabled. A bitmask of all Fs means
2572 that all ports will be enabled. This is an optional argument - default
2573 is all ports enabled.
2575 =item B<PortName> I<Name>
2577 A string containing an optional name for the enabled DPDK ports. Each PortName
2578 option should contain only one port name; specify as many PortName options as
2579 desired. Default naming convention will be used if PortName is blank. If there
2580 are less PortName options than there are enabled ports, the default naming
2581 convention will be used for the additional ports.
2585 =head2 Plugin C<email>
2589 =item B<SocketFile> I<Path>
2591 Sets the socket-file which is to be created.
2593 =item B<SocketGroup> I<Group>
2595 If running as root change the group of the UNIX-socket after it has been
2596 created. Defaults to B<collectd>.
2598 =item B<SocketPerms> I<Permissions>
2600 Change the file permissions of the UNIX-socket after it has been created. The
2601 permissions must be given as a numeric, octal value as you would pass to
2602 L<chmod(1)>. Defaults to B<0770>.
2604 =item B<MaxConns> I<Number>
2606 Sets the maximum number of connections that can be handled in parallel. Since
2607 this many threads will be started immediately setting this to a very high
2608 value will waste valuable resources. Defaults to B<5> and will be forced to be
2609 at most B<16384> to prevent typos and dumb mistakes.
2613 =head2 Plugin C<ethstat>
2615 The I<ethstat plugin> collects information about network interface cards (NICs)
2616 by talking directly with the underlying kernel driver using L<ioctl(2)>.
2622 Map "rx_csum_offload_errors" "if_rx_errors" "checksum_offload"
2623 Map "multicast" "if_multicast"
2630 =item B<Interface> I<Name>
2632 Collect statistical information about interface I<Name>.
2634 =item B<Map> I<Name> I<Type> [I<TypeInstance>]
2636 By default, the plugin will submit values as type C<derive> and I<type
2637 instance> set to I<Name>, the name of the metric as reported by the driver. If
2638 an appropriate B<Map> option exists, the given I<Type> and, optionally,
2639 I<TypeInstance> will be used.
2641 =item B<MappedOnly> B<true>|B<false>
2643 When set to B<true>, only metrics that can be mapped to a I<type> will be
2644 collected, all other metrics will be ignored. Defaults to B<false>.
2648 =head2 Plugin C<exec>
2650 Please make sure to read L<collectd-exec(5)> before using this plugin. It
2651 contains valuable information on when the executable is executed and the
2652 output that is expected from it.
2656 =item B<Exec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2658 =item B<NotificationExec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2660 Execute the executable I<Executable> as user I<User>. If the user name is
2661 followed by a colon and a group name, the effective group is set to that group.
2662 The real group and saved-set group will be set to the default group of that
2663 user. If no group is given the effective group ID will be the same as the real
2666 Please note that in order to change the user and/or group the daemon needs
2667 superuser privileges. If the daemon is run as an unprivileged user you must
2668 specify the same user/group here. If the daemon is run with superuser
2669 privileges, you must supply a non-root user here.
2671 The executable may be followed by optional arguments that are passed to the
2672 program. Please note that due to the configuration parsing numbers and boolean
2673 values may be changed. If you want to be absolutely sure that something is
2674 passed as-is please enclose it in quotes.
2676 The B<Exec> and B<NotificationExec> statements change the semantics of the
2677 programs executed, i.E<nbsp>e. the data passed to them and the response
2678 expected from them. This is documented in great detail in L<collectd-exec(5)>.
2682 =head2 Plugin C<fhcount>
2684 The C<fhcount> plugin provides statistics about used, unused and total number of
2685 file handles on Linux.
2687 The I<fhcount plugin> provides the following configuration options:
2691 =item B<ValuesAbsolute> B<true>|B<false>
2693 Enables or disables reporting of file handles usage in absolute numbers,
2694 e.g. file handles used. Defaults to B<true>.
2696 =item B<ValuesPercentage> B<false>|B<true>
2698 Enables or disables reporting of file handles usage in percentages, e.g.
2699 percent of file handles used. Defaults to B<false>.
2703 =head2 Plugin C<filecount>
2705 The C<filecount> plugin counts the number of files in a certain directory (and
2706 its subdirectories) and their combined size. The configuration is very straight
2709 <Plugin "filecount">
2710 <Directory "/var/qmail/queue/mess">
2711 Instance "qmail-message"
2713 <Directory "/var/qmail/queue/todo">
2714 Instance "qmail-todo"
2716 <Directory "/var/lib/php5">
2717 Instance "php5-sessions"
2722 The example above counts the number of files in QMail's queue directories and
2723 the number of PHP5 sessions. Jfiy: The "todo" queue holds the messages that
2724 QMail has not yet looked at, the "message" queue holds the messages that were
2725 classified into "local" and "remote".
2727 As you can see, the configuration consists of one or more C<Directory> blocks,
2728 each of which specifies a directory in which to count the files. Within those
2729 blocks, the following options are recognized:
2733 =item B<Instance> I<Instance>
2735 Sets the plugin instance to I<Instance>. That instance name must be unique, but
2736 it's your responsibility, the plugin doesn't check for that. If not given, the
2737 instance is set to the directory name with all slashes replaced by underscores
2738 and all leading underscores removed.
2740 =item B<Name> I<Pattern>
2742 Only count files that match I<Pattern>, where I<Pattern> is a shell-like
2743 wildcard as understood by L<fnmatch(3)>. Only the B<filename> is checked
2744 against the pattern, not the entire path. In case this makes it easier for you:
2745 This option has been named after the B<-name> parameter to L<find(1)>.
2747 =item B<MTime> I<Age>
2749 Count only files of a specific age: If I<Age> is greater than zero, only files
2750 that haven't been touched in the last I<Age> seconds are counted. If I<Age> is
2751 a negative number, this is inversed. For example, if B<-60> is specified, only
2752 files that have been modified in the last minute will be counted.
2754 The number can also be followed by a "multiplier" to easily specify a larger
2755 timespan. When given in this notation, the argument must in quoted, i.E<nbsp>e.
2756 must be passed as string. So the B<-60> could also be written as B<"-1m"> (one
2757 minute). Valid multipliers are C<s> (second), C<m> (minute), C<h> (hour), C<d>
2758 (day), C<w> (week), and C<y> (year). There is no "month" multiplier. You can
2759 also specify fractional numbers, e.E<nbsp>g. B<"0.5d"> is identical to
2762 =item B<Size> I<Size>
2764 Count only files of a specific size. When I<Size> is a positive number, only
2765 files that are at least this big are counted. If I<Size> is a negative number,
2766 this is inversed, i.E<nbsp>e. only files smaller than the absolute value of
2767 I<Size> are counted.
2769 As with the B<MTime> option, a "multiplier" may be added. For a detailed
2770 description see above. Valid multipliers here are C<b> (byte), C<k> (kilobyte),
2771 C<m> (megabyte), C<g> (gigabyte), C<t> (terabyte), and C<p> (petabyte). Please
2772 note that there are 1000 bytes in a kilobyte, not 1024.
2774 =item B<Recursive> I<true>|I<false>
2776 Controls whether or not to recurse into subdirectories. Enabled by default.
2778 =item B<IncludeHidden> I<true>|I<false>
2780 Controls whether or not to include "hidden" files and directories in the count.
2781 "Hidden" files and directories are those, whose name begins with a dot.
2782 Defaults to I<false>, i.e. by default hidden files and directories are ignored.
2786 =head2 Plugin C<GenericJMX>
2788 The I<GenericJMX plugin> is written in I<Java> and therefore documented in
2789 L<collectd-java(5)>.
2791 =head2 Plugin C<gmond>
2793 The I<gmond> plugin received the multicast traffic sent by B<gmond>, the
2794 statistics collection daemon of Ganglia. Mappings for the standard "metrics"
2795 are built-in, custom mappings may be added via B<Metric> blocks, see below.
2800 MCReceiveFrom "239.2.11.71" "8649"
2801 <Metric "swap_total">
2803 TypeInstance "total"
2806 <Metric "swap_free">
2813 The following metrics are built-in:
2819 load_one, load_five, load_fifteen
2823 cpu_user, cpu_system, cpu_idle, cpu_nice, cpu_wio
2827 mem_free, mem_shared, mem_buffers, mem_cached, mem_total
2839 Available configuration options:
2843 =item B<MCReceiveFrom> I<MCGroup> [I<Port>]
2845 Sets sets the multicast group and UDP port to which to subscribe.
2847 Default: B<239.2.11.71>E<nbsp>/E<nbsp>B<8649>
2849 =item E<lt>B<Metric> I<Name>E<gt>
2851 These blocks add a new metric conversion to the internal table. I<Name>, the
2852 string argument to the B<Metric> block, is the metric name as used by Ganglia.
2856 =item B<Type> I<Type>
2858 Type to map this metric to. Required.
2860 =item B<TypeInstance> I<Instance>
2862 Type-instance to use. Optional.
2864 =item B<DataSource> I<Name>
2866 Data source to map this metric to. If the configured type has exactly one data
2867 source, this is optional. Otherwise the option is required.
2873 =head2 Plugin C<gps>
2875 The C<gps plugin> connects to gpsd on the host machine.
2876 The host, port, timeout and pause are configurable.
2878 This is useful if you run an NTP server using a GPS for source and you want to
2881 Mind your GPS must send $--GSA for having the data reported!
2883 The following elements are collected:
2889 Number of satellites used for fix (type instance "used") and in view (type
2890 instance "visible"). 0 means no GPS satellites are visible.
2892 =item B<dilution_of_precision>
2894 Vertical and horizontal dilution (type instance "horizontal" or "vertical").
2895 It should be between 0 and 3.
2896 Look at the documentation of your GPS to know more.
2904 # Connect to localhost on gpsd regular port:
2909 # PauseConnect of 5 sec. between connection attempts.
2913 Available configuration options:
2917 =item B<Host> I<Host>
2919 The host on which gpsd daemon runs. Defaults to B<localhost>.
2921 =item B<Port> I<Port>
2923 Port to connect to gpsd on the host machine. Defaults to B<2947>.
2925 =item B<Timeout> I<Seconds>
2927 Timeout in seconds (default 0.015 sec).
2929 The GPS data stream is fetch by the plugin form the daemon.
2930 It waits for data to be available, if none arrives it times out
2931 and loop for another reading.
2932 Mind to put a low value gpsd expects value in the micro-seconds area
2933 (recommended is 500 us) since the waiting function is blocking.
2934 Value must be between 500 us and 5 sec., if outside that range the
2935 default value is applied.
2937 This only applies from gpsd release-2.95.
2939 =item B<PauseConnect> I<Seconds>
2941 Pause to apply between attempts of connection to gpsd in seconds (default 5 sec).
2945 =head2 Plugin C<grpc>
2947 The I<grpc> plugin provides an RPC interface to submit values to or query
2948 values from collectd based on the open source gRPC framework. It exposes an
2949 end-point for dispatching values to the daemon.
2951 The B<gRPC> homepage can be found at L<https://grpc.io/>.
2955 =item B<Server> I<Host> I<Port>
2957 The B<Server> statement sets the address of a server to which to send metrics
2958 via the C<DispatchValues> function.
2960 The argument I<Host> may be a hostname, an IPv4 address, or an IPv6 address.
2962 Optionally, B<Server> may be specified as a configuration block which supports
2963 the following options:
2967 =item B<EnableSSL> B<false>|B<true>
2969 Whether to require SSL for outgoing connections. Default: false.
2971 =item B<SSLCACertificateFile> I<Filename>
2973 =item B<SSLCertificateFile> I<Filename>
2975 =item B<SSLCertificateKeyFile> I<Filename>
2977 Filenames specifying SSL certificate and key material to be used with SSL
2982 =item B<Listen> I<Host> I<Port>
2984 The B<Listen> statement sets the network address to bind to. When multiple
2985 statements are specified, the daemon will bind to all of them. If none are
2986 specified, it defaults to B<0.0.0.0:50051>.
2988 The argument I<Host> may be a hostname, an IPv4 address, or an IPv6 address.
2990 Optionally, B<Listen> may be specified as a configuration block which
2991 supports the following options:
2995 =item B<EnableSSL> I<true>|I<false>
2997 Whether to enable SSL for incoming connections. Default: false.
2999 =item B<SSLCACertificateFile> I<Filename>
3001 =item B<SSLCertificateFile> I<Filename>
3003 =item B<SSLCertificateKeyFile> I<Filename>
3005 Filenames specifying SSL certificate and key material to be used with SSL
3012 =head2 Plugin C<hddtemp>
3014 To get values from B<hddtemp> collectd connects to B<localhost> (127.0.0.1),
3015 port B<7634/tcp>. The B<Host> and B<Port> options can be used to change these
3016 default values, see below. C<hddtemp> has to be running to work correctly. If
3017 C<hddtemp> is not running timeouts may appear which may interfere with other
3020 The B<hddtemp> homepage can be found at
3021 L<http://www.guzu.net/linux/hddtemp.php>.
3025 =item B<Host> I<Hostname>
3027 Hostname to connect to. Defaults to B<127.0.0.1>.
3029 =item B<Port> I<Port>
3031 TCP-Port to connect to. Defaults to B<7634>.
3035 =head2 Plugin C<hugepages>
3037 To collect B<hugepages> information, collectd reads directories
3038 "/sys/devices/system/node/*/hugepages" and
3039 "/sys/kernel/mm/hugepages".
3040 Reading of these directories can be disabled by the following
3041 options (default is enabled).
3045 =item B<ReportPerNodeHP> B<true>|B<false>
3047 If enabled, information will be collected from the hugepage
3048 counters in "/sys/devices/system/node/*/hugepages".
3049 This is used to check the per-node hugepage statistics on
3052 =item B<ReportRootHP> B<true>|B<false>
3054 If enabled, information will be collected from the hugepage
3055 counters in "/sys/kernel/mm/hugepages".
3056 This can be used on both NUMA and non-NUMA systems to check
3057 the overall hugepage statistics.
3059 =item B<ValuesPages> B<true>|B<false>
3061 Whether to report hugepages metrics in number of pages.
3062 Defaults to B<true>.
3064 =item B<ValuesBytes> B<false>|B<true>
3066 Whether to report hugepages metrics in bytes.
3067 Defaults to B<false>.
3069 =item B<ValuesPercentage> B<false>|B<true>
3071 Whether to report hugepages metrics as percentage.
3072 Defaults to B<false>.
3076 =head2 Plugin C<intel_rdt>
3078 The I<intel_rdt> plugin collects information provided by monitoring features of
3079 Intel Resource Director Technology (Intel(R) RDT) like Cache Monitoring
3080 Technology (CMT), Memory Bandwidth Monitoring (MBM). These features provide
3081 information about utilization of shared resources. CMT monitors last level cache
3082 occupancy (LLC). MBM supports two types of events reporting local and remote
3083 memory bandwidth. Local memory bandwidth (MBL) reports the bandwidth of
3084 accessing memory associated with the local socket. Remote memory bandwidth (MBR)
3085 reports the bandwidth of accessing the remote socket. Also this technology
3086 allows to monitor instructions per clock (IPC).
3087 Monitor events are hardware dependant. Monitoring capabilities are detected on
3088 plugin initialization and only supported events are monitored.
3090 B<Note:> I<intel_rdt> plugin is using model-specific registers (MSRs), which
3091 require an additional capability to be enabled if collectd is run as a service.
3092 Please refer to I<contrib/systemd.collectd.service> file for more details.
3096 <Plugin "intel_rdt">
3097 Cores "0-2" "3,4,6" "8-10,15"
3104 =item B<Interval> I<seconds>
3106 The interval within which to retrieve statistics on monitored events in seconds.
3107 For milliseconds divide the time by 1000 for example if the desired interval
3108 is 50ms, set interval to 0.05. Due to limited capacity of counters it is not
3109 recommended to set interval higher than 1 sec.
3111 =item B<Cores> I<cores groups>
3113 All events are reported on a per core basis. Monitoring of the events can be
3114 configured for group of cores (aggregated statistics). This field defines groups
3115 of cores on which to monitor supported events. The field is represented as list
3116 of strings with core group values. Each string represents a list of cores in a
3117 group. Allowed formats are:
3122 If an empty string is provided as value for this field default cores
3123 configuration is applied - a separate group is created for each core.
3127 B<Note:> By default global interval is used to retrieve statistics on monitored
3128 events. To configure a plugin specific interval use B<Interval> option of the
3129 intel_rdt <LoadPlugin> block. For milliseconds divide the time by 1000 for
3130 example if the desired interval is 50ms, set interval to 0.05.
3131 Due to limited capacity of counters it is not recommended to set interval higher
3134 =head2 Plugin C<interface>
3138 =item B<Interface> I<Interface>
3140 Select this interface. By default these interfaces will then be collected. For
3141 a more detailed description see B<IgnoreSelected> below.
3143 See F</"IGNORELISTS"> for details.
3145 =item B<IgnoreSelected> I<true>|I<false>
3147 If no configuration is given, the B<interface>-plugin will collect data from
3148 all interfaces. This may not be practical, especially for loopback- and
3149 similar interfaces. Thus, you can use the B<Interface>-option to pick the
3150 interfaces you're interested in. Sometimes, however, it's easier/preferred
3151 to collect all interfaces I<except> a few ones. This option enables you to
3152 do that: By setting B<IgnoreSelected> to I<true> the effect of
3153 B<Interface> is inverted: All selected interfaces are ignored and all
3154 other interfaces are collected.
3156 It is possible to use regular expressions to match interface names, if the
3157 name is surrounded by I</.../> and collectd was compiled with support for
3158 regexps. This is useful if there's a need to collect (or ignore) data
3159 for a group of interfaces that are similarly named, without the need to
3160 explicitly list all of them (especially useful if the list is dynamic).
3165 Interface "/^tun[0-9]+/"
3166 IgnoreSelected "true"
3168 This will ignore the loopback interface, all interfaces with names starting
3169 with I<veth> and all interfaces with names starting with I<tun> followed by
3172 =item B<ReportInactive> I<true>|I<false>
3174 When set to I<false>, only interfaces with non-zero traffic will be
3175 reported. Note that the check is done by looking into whether a
3176 package was sent at any time from boot and the corresponding counter
3177 is non-zero. So, if the interface has been sending data in the past
3178 since boot, but not during the reported time-interval, it will still
3181 The default value is I<true> and results in collection of the data
3182 from all interfaces that are selected by B<Interface> and
3183 B<IgnoreSelected> options.
3185 =item B<UniqueName> I<true>|I<false>
3187 Interface name is not unique on Solaris (KSTAT), interface name is unique
3188 only within a module/instance. Following tuple is considered unique:
3189 (ks_module, ks_instance, ks_name)
3190 If this option is set to true, interface name contains above three fields
3191 separated by an underscore. For more info on KSTAT, visit
3192 L<http://docs.oracle.com/cd/E23824_01/html/821-1468/kstat-3kstat.html#REFMAN3Ekstat-3kstat>
3194 This option is only available on Solaris.
3198 =head2 Plugin C<ipmi>
3202 =item B<Sensor> I<Sensor>
3204 Selects sensors to collect or to ignore, depending on B<IgnoreSelected>.
3206 See F</"IGNORELISTS"> for details.
3208 =item B<IgnoreSelected> I<true>|I<false>
3210 If no configuration if given, the B<ipmi> plugin will collect data from all
3211 sensors found of type "temperature", "voltage", "current" and "fanspeed".
3212 This option enables you to do that: By setting B<IgnoreSelected> to I<true>
3213 the effect of B<Sensor> is inverted: All selected sensors are ignored and
3214 all other sensors are collected.
3216 =item B<NotifySensorAdd> I<true>|I<false>
3218 If a sensor appears after initialization time of a minute a notification
3221 =item B<NotifySensorRemove> I<true>|I<false>
3223 If a sensor disappears a notification is sent.
3225 =item B<NotifySensorNotPresent> I<true>|I<false>
3227 If you have for example dual power supply and one of them is (un)plugged then
3228 a notification is sent.
3232 =head2 Plugin C<iptables>
3236 =item B<Chain> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
3238 =item B<Chain6> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
3240 Select the iptables/ip6tables filter rules to count packets and bytes from.
3242 If only I<Table> and I<Chain> are given, this plugin will collect the counters
3243 of all rules which have a comment-match. The comment is then used as
3246 If I<Comment> or I<Number> is given, only the rule with the matching comment or
3247 the I<n>th rule will be collected. Again, the comment (or the number) will be
3248 used as the type-instance.
3250 If I<Name> is supplied, it will be used as the type-instance instead of the
3251 comment or the number.
3255 =head2 Plugin C<irq>
3261 Select this irq. By default these irqs will then be collected. For a more
3262 detailed description see B<IgnoreSelected> below.
3264 See F</"IGNORELISTS"> for details.
3266 =item B<IgnoreSelected> I<true>|I<false>
3268 If no configuration if given, the B<irq>-plugin will collect data from all
3269 irqs. This may not be practical, especially if no interrupts happen. Thus, you
3270 can use the B<Irq>-option to pick the interrupt you're interested in.
3271 Sometimes, however, it's easier/preferred to collect all interrupts I<except> a
3272 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
3273 I<true> the effect of B<Irq> is inverted: All selected interrupts are ignored
3274 and all other interrupts are collected.
3278 =head2 Plugin C<java>
3280 The I<Java> plugin makes it possible to write extensions for collectd in Java.
3281 This section only discusses the syntax and semantic of the configuration
3282 options. For more in-depth information on the I<Java> plugin, please read
3283 L<collectd-java(5)>.
3288 JVMArg "-verbose:jni"
3289 JVMArg "-Djava.class.path=/opt/collectd/lib/collectd/bindings/java"
3290 LoadPlugin "org.collectd.java.Foobar"
3291 <Plugin "org.collectd.java.Foobar">
3292 # To be parsed by the plugin
3296 Available configuration options:
3300 =item B<JVMArg> I<Argument>
3302 Argument that is to be passed to the I<Java Virtual Machine> (JVM). This works
3303 exactly the way the arguments to the I<java> binary on the command line work.
3304 Execute C<javaE<nbsp>--help> for details.
3306 Please note that B<all> these options must appear B<before> (i.E<nbsp>e. above)
3307 any other options! When another option is found, the JVM will be started and
3308 later options will have to be ignored!
3310 =item B<LoadPlugin> I<JavaClass>
3312 Instantiates a new I<JavaClass> object. The constructor of this object very
3313 likely then registers one or more callback methods with the server.
3315 See L<collectd-java(5)> for details.
3317 When the first such option is found, the virtual machine (JVM) is created. This
3318 means that all B<JVMArg> options must appear before (i.E<nbsp>e. above) all
3319 B<LoadPlugin> options!
3321 =item B<Plugin> I<Name>
3323 The entire block is passed to the Java plugin as an
3324 I<org.collectd.api.OConfigItem> object.
3326 For this to work, the plugin has to register a configuration callback first,
3327 see L<collectd-java(5)/"config callback">. This means, that the B<Plugin> block
3328 must appear after the appropriate B<LoadPlugin> block. Also note, that I<Name>
3329 depends on the (Java) plugin registering the callback and is completely
3330 independent from the I<JavaClass> argument passed to B<LoadPlugin>.
3334 =head2 Plugin C<load>
3336 The I<Load plugin> collects the system load. These numbers give a rough overview
3337 over the utilization of a machine. The system load is defined as the number of
3338 runnable tasks in the run-queue and is provided by many operating systems as a
3339 one, five or fifteen minute average.
3341 The following configuration options are available:
3345 =item B<ReportRelative> B<false>|B<true>
3347 When enabled, system load divided by number of available CPU cores is reported
3348 for intervals 1 min, 5 min and 15 min. Defaults to false.
3353 =head2 Plugin C<logfile>
3357 =item B<LogLevel> B<debug|info|notice|warning|err>
3359 Sets the log-level. If, for example, set to B<notice>, then all events with
3360 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
3362 Please note that B<debug> is only available if collectd has been compiled with
3365 =item B<File> I<File>
3367 Sets the file to write log messages to. The special strings B<stdout> and
3368 B<stderr> can be used to write to the standard output and standard error
3369 channels, respectively. This, of course, only makes much sense when I<collectd>
3370 is running in foreground- or non-daemon-mode.
3372 =item B<Timestamp> B<true>|B<false>
3374 Prefix all lines printed by the current time. Defaults to B<true>.
3376 =item B<PrintSeverity> B<true>|B<false>
3378 When enabled, all lines are prefixed by the severity of the log message, for
3379 example "warning". Defaults to B<false>.
3383 B<Note>: There is no need to notify the daemon after moving or removing the
3384 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
3385 for each line it writes.
3387 =head2 Plugin C<log_logstash>
3389 The I<log logstash plugin> behaves like the logfile plugin but formats
3390 messages as JSON events for logstash to parse and input.
3394 =item B<LogLevel> B<debug|info|notice|warning|err>
3396 Sets the log-level. If, for example, set to B<notice>, then all events with
3397 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
3399 Please note that B<debug> is only available if collectd has been compiled with
3402 =item B<File> I<File>
3404 Sets the file to write log messages to. The special strings B<stdout> and
3405 B<stderr> can be used to write to the standard output and standard error
3406 channels, respectively. This, of course, only makes much sense when I<collectd>
3407 is running in foreground- or non-daemon-mode.
3411 B<Note>: There is no need to notify the daemon after moving or removing the
3412 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
3413 for each line it writes.
3415 =head2 Plugin C<lpar>
3417 The I<LPAR plugin> reads CPU statistics of I<Logical Partitions>, a
3418 virtualization technique for IBM POWER processors. It takes into account CPU
3419 time stolen from or donated to a partition, in addition to the usual user,
3420 system, I/O statistics.
3422 The following configuration options are available:
3426 =item B<CpuPoolStats> B<false>|B<true>
3428 When enabled, statistics about the processor pool are read, too. The partition
3429 needs to have pool authority in order to be able to acquire this information.
3432 =item B<ReportBySerial> B<false>|B<true>
3434 If enabled, the serial of the physical machine the partition is currently
3435 running on is reported as I<hostname> and the logical hostname of the machine
3436 is reported in the I<plugin instance>. Otherwise, the logical hostname will be
3437 used (just like other plugins) and the I<plugin instance> will be empty.
3442 =head2 Plugin C<lua>
3444 This plugin embeds a Lua interpreter into collectd and provides an interface
3445 to collectd's plugin system. See L<collectd-lua(5)> for its documentation.
3448 =head2 Plugin C<mbmon>
3450 The C<mbmon plugin> uses mbmon to retrieve temperature, voltage, etc.
3452 Be default collectd connects to B<localhost> (127.0.0.1), port B<411/tcp>. The
3453 B<Host> and B<Port> options can be used to change these values, see below.
3454 C<mbmon> has to be running to work correctly. If C<mbmon> is not running
3455 timeouts may appear which may interfere with other statistics..
3457 C<mbmon> must be run with the -r option ("print TAG and Value format");
3458 Debian's F</etc/init.d/mbmon> script already does this, other people
3459 will need to ensure that this is the case.
3463 =item B<Host> I<Hostname>
3465 Hostname to connect to. Defaults to B<127.0.0.1>.
3467 =item B<Port> I<Port>
3469 TCP-Port to connect to. Defaults to B<411>.
3473 =head2 Plugin C<mcelog>
3475 The C<mcelog plugin> uses mcelog to retrieve machine check exceptions.
3477 By default the plugin connects to B<"/var/run/mcelog-client"> to check if the
3478 mcelog server is running. When the server is running, the plugin will tail the
3479 specified logfile to retrieve machine check exception information and send a
3480 notification with the details from the logfile. The plugin will use the mcelog
3481 client protocol to retrieve memory related machine check exceptions. Note that
3482 for memory exceptions, notifications are only sent when there is a change in
3483 the number of corrected/uncorrected memory errors.
3485 =head3 The Memory block
3487 Note: these options cannot be used in conjunction with the logfile options, they are mutually
3492 =item B<McelogClientSocket> I<Path>
3493 Connect to the mcelog client socket using the UNIX domain socket at I<Path>.
3494 Defaults to B<"/var/run/mcelog-client">.
3496 =item B<PersistentNotification> B<true>|B<false>
3497 Override default configuration to only send notifications when sent when there
3498 is a change in the number of corrected/uncorrected memory errors. When set to
3499 true notifications will be sent for every read cycle. Default is false. Does
3500 not affect the stats being dispatched.
3506 =item B<McelogLogfile> I<Path>
3508 The mcelog file to parse. Defaults to B<"/var/log/mcelog">. Note: this option
3509 cannot be used in conjunction with the memory block options, they are mutually
3516 The C<md plugin> collects information from Linux Software-RAID devices (md).
3518 All reported values are of the type C<md_disks>. Reported type instances are
3519 I<active>, I<failed> (present but not operational), I<spare> (hot stand-by) and
3520 I<missing> (physically absent) disks.
3524 =item B<Device> I<Device>
3526 Select md devices based on device name. The I<device name> is the basename of
3527 the device, i.e. the name of the block device without the leading C</dev/>.
3528 See B<IgnoreSelected> for more details.
3530 See F</"IGNORELISTS"> for details.
3532 =item B<IgnoreSelected> B<true>|B<false>
3534 Invert device selection: If set to B<true>, all md devices B<except> those
3535 listed using B<Device> are collected. If B<false> (the default), only those
3536 listed are collected. If no configuration is given, the B<md> plugin will
3537 collect data from all md devices.
3541 =head2 Plugin C<memcachec>
3543 The C<memcachec plugin> connects to a memcached server, queries one or more
3544 given I<pages> and parses the returned data according to user specification.
3545 The I<matches> used are the same as the matches used in the C<curl> and C<tail>
3548 In order to talk to the memcached server, this plugin uses the I<libmemcached>
3549 library. Please note that there is another library with a very similar name,
3550 libmemcache (notice the missing `d'), which is not applicable.
3552 Synopsis of the configuration:
3554 <Plugin "memcachec">
3555 <Page "plugin_instance">
3559 Regex "(\\d+) bytes sent"
3562 Instance "type_instance"
3567 The configuration options are:
3571 =item E<lt>B<Page> I<Name>E<gt>
3573 Each B<Page> block defines one I<page> to be queried from the memcached server.
3574 The block requires one string argument which is used as I<plugin instance>.
3576 =item B<Server> I<Address>
3578 Sets the server address to connect to when querying the page. Must be inside a
3583 When connected to the memcached server, asks for the page I<Key>.
3585 =item E<lt>B<Match>E<gt>
3587 Match blocks define which strings to look for and how matches substrings are
3588 interpreted. For a description of match blocks, please see L<"Plugin tail">.
3592 =head2 Plugin C<memcached>
3594 The B<memcached plugin> connects to a memcached server and queries statistics
3595 about cache utilization, memory and bandwidth used.
3596 L<http://memcached.org/>
3598 <Plugin "memcached">
3600 #Host "memcache.example.com"
3606 The plugin configuration consists of one or more B<Instance> blocks which
3607 specify one I<memcached> connection each. Within the B<Instance> blocks, the
3608 following options are allowed:
3612 =item B<Host> I<Hostname>
3614 Sets the B<host> field of dispatched values. Defaults to the global hostname
3616 For backwards compatibility, values are also dispatched with the global
3617 hostname when B<Host> is set to B<127.0.0.1> or B<localhost> and B<Address> is
3620 =item B<Address> I<Address>
3622 Hostname or IP to connect to. For backwards compatibility, defaults to the
3623 value of B<Host> or B<127.0.0.1> if B<Host> is unset.
3625 =item B<Port> I<Port>
3627 TCP port to connect to. Defaults to B<11211>.
3629 =item B<Socket> I<Path>
3631 Connect to I<memcached> using the UNIX domain socket at I<Path>. If this
3632 setting is given, the B<Address> and B<Port> settings are ignored.
3636 =head2 Plugin C<mic>
3638 The B<mic plugin> gathers CPU statistics, memory usage and temperatures from
3639 Intel's Many Integrated Core (MIC) systems.
3648 ShowTemperatures true
3651 IgnoreSelectedTemperature true
3656 IgnoreSelectedPower true
3659 The following options are valid inside the B<PluginE<nbsp>mic> block:
3663 =item B<ShowCPU> B<true>|B<false>
3665 If enabled (the default) a sum of the CPU usage across all cores is reported.
3667 =item B<ShowCPUCores> B<true>|B<false>
3669 If enabled (the default) per-core CPU usage is reported.
3671 =item B<ShowMemory> B<true>|B<false>
3673 If enabled (the default) the physical memory usage of the MIC system is
3676 =item B<ShowTemperatures> B<true>|B<false>
3678 If enabled (the default) various temperatures of the MIC system are reported.
3680 =item B<Temperature> I<Name>
3682 This option controls which temperatures are being reported. Whether matching
3683 temperatures are being ignored or I<only> matching temperatures are reported
3684 depends on the B<IgnoreSelectedTemperature> setting below. By default I<all>
3685 temperatures are reported.
3687 =item B<IgnoreSelectedTemperature> B<false>|B<true>
3689 Controls the behavior of the B<Temperature> setting above. If set to B<false>
3690 (the default) only temperatures matching a B<Temperature> option are reported
3691 or, if no B<Temperature> option is specified, all temperatures are reported. If
3692 set to B<true>, matching temperatures are I<ignored> and all other temperatures
3695 Known temperature names are:
3729 =item B<ShowPower> B<true>|B<false>
3731 If enabled (the default) various temperatures of the MIC system are reported.
3733 =item B<Power> I<Name>
3735 This option controls which power readings are being reported. Whether matching
3736 power readings are being ignored or I<only> matching power readings are reported
3737 depends on the B<IgnoreSelectedPower> setting below. By default I<all>
3738 power readings are reported.
3740 =item B<IgnoreSelectedPower> B<false>|B<true>
3742 Controls the behavior of the B<Power> setting above. If set to B<false>
3743 (the default) only power readings matching a B<Power> option are reported
3744 or, if no B<Power> option is specified, all power readings are reported. If
3745 set to B<true>, matching power readings are I<ignored> and all other power readings
3748 Known power names are:
3754 Total power utilization averaged over Time Window 0 (uWatts).
3758 Total power utilization averaged over Time Window 0 (uWatts).
3762 Instantaneous power (uWatts).
3766 Max instantaneous power (uWatts).
3770 PCI-E connector power (uWatts).
3774 2x3 connector power (uWatts).
3778 2x4 connector power (uWatts).
3786 Uncore rail (uVolts).
3790 Memory subsystem rail (uVolts).
3796 =head2 Plugin C<memory>
3798 The I<memory plugin> provides the following configuration options:
3802 =item B<ValuesAbsolute> B<true>|B<false>
3804 Enables or disables reporting of physical memory usage in absolute numbers,
3805 i.e. bytes. Defaults to B<true>.
3807 =item B<ValuesPercentage> B<false>|B<true>
3809 Enables or disables reporting of physical memory usage in percentages, e.g.
3810 percent of physical memory used. Defaults to B<false>.
3812 This is useful for deploying I<collectd> in a heterogeneous environment in
3813 which the sizes of physical memory vary.
3817 =head2 Plugin C<modbus>
3819 The B<modbus plugin> connects to a Modbus "slave" via Modbus/TCP or Modbus/RTU and
3820 reads register values. It supports reading single registers (unsigned 16E<nbsp>bit
3821 values), large integer values (unsigned 32E<nbsp>bit values) and floating point
3822 values (two registers interpreted as IEEE floats in big endian notation).
3826 <Data "voltage-input-1">
3829 RegisterCmd ReadHolding
3834 <Data "voltage-input-2">
3837 RegisterCmd ReadHolding
3842 <Data "supply-temperature-1">
3845 RegisterCmd ReadHolding
3850 <Host "modbus.example.com">
3851 Address "192.168.0.42"
3856 Instance "power-supply"
3857 Collect "voltage-input-1"
3858 Collect "voltage-input-2"
3863 Device "/dev/ttyUSB0"
3868 Instance "temperature"
3869 Collect "supply-temperature-1"
3875 =item E<lt>B<Data> I<Name>E<gt> blocks
3877 Data blocks define a mapping between register numbers and the "types" used by
3880 Within E<lt>DataE<nbsp>/E<gt> blocks, the following options are allowed:
3884 =item B<RegisterBase> I<Number>
3886 Configures the base register to read from the device. If the option
3887 B<RegisterType> has been set to B<Uint32> or B<Float>, this and the next
3888 register will be read (the register number is increased by one).
3890 =item B<RegisterType> B<Int16>|B<Int32>|B<Uint16>|B<Uint32>|B<Float>
3892 Specifies what kind of data is returned by the device. If the type is B<Int32>,
3893 B<Uint32> or B<Float>, two 16E<nbsp>bit registers will be read and the data is
3894 combined into one value. Defaults to B<Uint16>.
3896 =item B<RegisterCmd> B<ReadHolding>|B<ReadInput>
3898 Specifies register type to be collected from device. Works only with libmodbus
3899 2.9.2 or higher. Defaults to B<ReadHolding>.
3901 =item B<Type> I<Type>
3903 Specifies the "type" (data set) to use when dispatching the value to
3904 I<collectd>. Currently, only data sets with exactly one data source are
3907 =item B<Instance> I<Instance>
3909 Sets the type instance to use when dispatching the value to I<collectd>. If
3910 unset, an empty string (no type instance) is used.
3914 =item E<lt>B<Host> I<Name>E<gt> blocks
3916 Host blocks are used to specify to which hosts to connect and what data to read
3917 from their "slaves". The string argument I<Name> is used as hostname when
3918 dispatching the values to I<collectd>.
3920 Within E<lt>HostE<nbsp>/E<gt> blocks, the following options are allowed:
3924 =item B<Address> I<Hostname>
3926 For Modbus/TCP, specifies the node name (the actual network address) used to
3927 connect to the host. This may be an IP address or a hostname. Please note that
3928 the used I<libmodbus> library only supports IPv4 at the moment.
3930 =item B<Port> I<Service>
3932 for Modbus/TCP, specifies the port used to connect to the host. The port can
3933 either be given as a number or as a service name. Please note that the
3934 I<Service> argument must be a string, even if ports are given in their numerical
3935 form. Defaults to "502".
3937 =item B<Device> I<Devicenode>
3939 For Modbus/RTU, specifies the path to the serial device being used.
3941 =item B<Baudrate> I<Baudrate>
3943 For Modbus/RTU, specifies the baud rate of the serial device.
3944 Note, connections currently support only 8/N/1.
3946 =item B<Interval> I<Interval>
3948 Sets the interval (in seconds) in which the values will be collected from this
3949 host. By default the global B<Interval> setting will be used.
3951 =item E<lt>B<Slave> I<ID>E<gt>
3953 Over each connection, multiple Modbus devices may be reached. The slave ID
3954 is used to specify which device should be addressed. For each device you want
3955 to query, one B<Slave> block must be given.
3957 Within E<lt>SlaveE<nbsp>/E<gt> blocks, the following options are allowed:
3961 =item B<Instance> I<Instance>
3963 Specify the plugin instance to use when dispatching the values to I<collectd>.
3964 By default "slave_I<ID>" is used.
3966 =item B<Collect> I<DataName>
3968 Specifies which data to retrieve from the device. I<DataName> must be the same
3969 string as the I<Name> argument passed to a B<Data> block. You can specify this
3970 option multiple times to collect more than one value from a slave. At least one
3971 B<Collect> option is mandatory.
3979 =head2 Plugin C<mqtt>
3981 The I<MQTT plugin> can send metrics to MQTT (B<Publish> blocks) and receive
3982 values from MQTT (B<Subscribe> blocks).
3988 Host "mqtt.example.com"
3992 Host "mqtt.example.com"
3997 The plugin's configuration is in B<Publish> and/or B<Subscribe> blocks,
3998 configuring the sending and receiving direction respectively. The plugin will
3999 register a write callback named C<mqtt/I<name>> where I<name> is the string
4000 argument given to the B<Publish> block. Both types of blocks share many but not
4001 all of the following options. If an option is valid in only one of the blocks,
4002 it will be mentioned explicitly.
4008 =item B<Host> I<Hostname>
4010 Hostname of the MQTT broker to connect to.
4012 =item B<Port> I<Service>
4014 Port number or service name of the MQTT broker to connect to.
4016 =item B<User> I<UserName>
4018 Username used when authenticating to the MQTT broker.
4020 =item B<Password> I<Password>
4022 Password used when authenticating to the MQTT broker.
4024 =item B<ClientId> I<ClientId>
4026 MQTT client ID to use. Defaults to the hostname used by I<collectd>.
4028 =item B<QoS> [B<0>-B<2>]
4030 Sets the I<Quality of Service>, with the values C<0>, C<1> and C<2> meaning:
4048 In B<Publish> blocks, this option determines the QoS flag set on outgoing
4049 messages and defaults to B<0>. In B<Subscribe> blocks, determines the maximum
4050 QoS setting the client is going to accept and defaults to B<2>. If the QoS flag
4051 on a message is larger than the maximum accepted QoS of a subscriber, the
4052 message's QoS will be downgraded.
4054 =item B<Prefix> I<Prefix> (Publish only)
4056 This plugin will use one topic per I<value list> which will looks like a path.
4057 I<Prefix> is used as the first path element and defaults to B<collectd>.
4059 An example topic name would be:
4061 collectd/cpu-0/cpu-user
4063 =item B<Retain> B<false>|B<true> (Publish only)
4065 Controls whether the MQTT broker will retain (keep a copy of) the last message
4066 sent to each topic and deliver it to new subscribers. Defaults to B<false>.
4068 =item B<StoreRates> B<true>|B<false> (Publish only)
4070 Controls whether C<DERIVE> and C<COUNTER> metrics are converted to a I<rate>
4071 before sending. Defaults to B<true>.
4073 =item B<CleanSession> B<true>|B<false> (Subscribe only)
4075 Controls whether the MQTT "cleans" the session up after the subscriber
4076 disconnects or if it maintains the subscriber's subscriptions and all messages
4077 that arrive while the subscriber is disconnected. Defaults to B<true>.
4079 =item B<Topic> I<TopicName> (Subscribe only)
4081 Configures the topic(s) to subscribe to. You can use the single level C<+> and
4082 multi level C<#> wildcards. Defaults to B<collectd/#>, i.e. all topics beneath
4083 the B<collectd> branch.
4085 =item B<CACert> I<file>
4087 Path to the PEM-encoded CA certificate file. Setting this option enables TLS
4088 communication with the MQTT broker, and as such, B<Port> should be the TLS-enabled
4089 port of the MQTT broker.
4090 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4092 =item B<CertificateFile> I<file>
4094 Path to the PEM-encoded certificate file to use as client certificate when
4095 connecting to the MQTT broker.
4096 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4098 =item B<CertificateKeyFile> I<file>
4100 Path to the unencrypted PEM-encoded key file corresponding to B<CertificateFile>.
4101 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4103 =item B<TLSProtocol> I<protocol>
4105 If configured, this specifies the string protocol version (e.g. C<tlsv1>,
4106 C<tlsv1.2>) to use for the TLS connection to the broker. If not set a default
4107 version is used which depends on the version of OpenSSL the Mosquitto library
4110 =item B<CipherSuite> I<ciphersuite>
4112 A string describing the ciphers available for use. See L<ciphers(1)> and the
4113 C<openssl ciphers> utility for more information. If unset, the default ciphers
4119 =head2 Plugin C<mysql>
4121 The C<mysql plugin> requires B<mysqlclient> to be installed. It connects to
4122 one or more databases when started and keeps the connection up as long as
4123 possible. When the connection is interrupted for whatever reason it will try
4124 to re-connect. The plugin will complain loudly in case anything goes wrong.
4126 This plugin issues the MySQL C<SHOW STATUS> / C<SHOW GLOBAL STATUS> command
4127 and collects information about MySQL network traffic, executed statements,
4128 requests, the query cache and threads by evaluating the
4129 C<Bytes_{received,sent}>, C<Com_*>, C<Handler_*>, C<Qcache_*> and C<Threads_*>
4130 return values. Please refer to the B<MySQL reference manual>, I<5.1.6. Server
4131 Status Variables> for an explanation of these values.
4133 Optionally, master and slave statistics may be collected in a MySQL
4134 replication setup. In that case, information about the synchronization state
4135 of the nodes are collected by evaluating the C<Position> return value of the
4136 C<SHOW MASTER STATUS> command and the C<Seconds_Behind_Master>,
4137 C<Read_Master_Log_Pos> and C<Exec_Master_Log_Pos> return values of the
4138 C<SHOW SLAVE STATUS> command. See the B<MySQL reference manual>,
4139 I<12.5.5.21 SHOW MASTER STATUS Syntax> and
4140 I<12.5.5.31 SHOW SLAVE STATUS Syntax> for details.
4152 SSLKey "/path/to/key.pem"
4153 SSLCert "/path/to/cert.pem"
4154 SSLCA "/path/to/ca.pem"
4155 SSLCAPath "/path/to/cas/"
4156 SSLCipher "DHE-RSA-AES256-SHA"
4162 Socket "/var/run/mysql/mysqld.sock"
4164 SlaveNotifications true
4170 Socket "/var/run/mysql/mysqld.sock"
4175 A B<Database> block defines one connection to a MySQL database. It accepts a
4176 single argument which specifies the name of the database. None of the other
4177 options are required. MySQL will use default values as documented in the
4178 "mysql_real_connect()" and "mysql_ssl_set()" sections in the
4179 B<MySQL reference manual>.
4183 =item B<Alias> I<Alias>
4185 Alias to use as sender instead of hostname when reporting. This may be useful
4186 when having cryptic hostnames.
4188 =item B<Host> I<Hostname>
4190 Hostname of the database server. Defaults to B<localhost>.
4192 =item B<User> I<Username>
4194 Username to use when connecting to the database. The user does not have to be
4195 granted any privileges (which is synonym to granting the C<USAGE> privilege),
4196 unless you want to collectd replication statistics (see B<MasterStats> and
4197 B<SlaveStats> below). In this case, the user needs the C<REPLICATION CLIENT>
4198 (or C<SUPER>) privileges. Else, any existing MySQL user will do.
4200 =item B<Password> I<Password>
4202 Password needed to log into the database.
4204 =item B<Database> I<Database>
4206 Select this database. Defaults to I<no database> which is a perfectly reasonable
4207 option for what this plugin does.
4209 =item B<Port> I<Port>
4211 TCP-port to connect to. The port must be specified in its numeric form, but it
4212 must be passed as a string nonetheless. For example:
4216 If B<Host> is set to B<localhost> (the default), this setting has no effect.
4217 See the documentation for the C<mysql_real_connect> function for details.
4219 =item B<Socket> I<Socket>
4221 Specifies the path to the UNIX domain socket of the MySQL server. This option
4222 only has any effect, if B<Host> is set to B<localhost> (the default).
4223 Otherwise, use the B<Port> option above. See the documentation for the
4224 C<mysql_real_connect> function for details.
4226 =item B<InnodbStats> I<true|false>
4228 If enabled, metrics about the InnoDB storage engine are collected.
4229 Disabled by default.
4231 =item B<MasterStats> I<true|false>
4233 =item B<SlaveStats> I<true|false>
4235 Enable the collection of master / slave statistics in a replication setup. In
4236 order to be able to get access to these statistics, the user needs special
4237 privileges. See the B<User> documentation above. Defaults to B<false>.
4239 =item B<SlaveNotifications> I<true|false>
4241 If enabled, the plugin sends a notification if the replication slave I/O and /
4242 or SQL threads are not running. Defaults to B<false>.
4244 =item B<WsrepStats> I<true|false>
4246 Enable the collection of wsrep plugin statistics, used in Master-Master
4247 replication setups like in MySQL Galera/Percona XtraDB Cluster.
4248 User needs only privileges to execute 'SHOW GLOBAL STATUS'
4250 =item B<ConnectTimeout> I<Seconds>
4252 Sets the connect timeout for the MySQL client.
4254 =item B<SSLKey> I<Path>
4256 If provided, the X509 key in PEM format.
4258 =item B<SSLCert> I<Path>
4260 If provided, the X509 cert in PEM format.
4262 =item B<SSLCA> I<Path>
4264 If provided, the CA file in PEM format (check OpenSSL docs).
4266 =item B<SSLCAPath> I<Path>
4268 If provided, the CA directory (check OpenSSL docs).
4270 =item B<SSLCipher> I<String>
4272 If provided, the SSL cipher to use.
4276 =head2 Plugin C<netapp>
4278 The netapp plugin can collect various performance and capacity information
4279 from a NetApp filer using the NetApp API.
4281 Please note that NetApp has a wide line of products and a lot of different
4282 software versions for each of these products. This plugin was developed for a
4283 NetApp FAS3040 running OnTap 7.2.3P8 and tested on FAS2050 7.3.1.1L1,
4284 FAS3140 7.2.5.1 and FAS3020 7.2.4P9. It I<should> work for most combinations of
4285 model and software version but it is very hard to test this.
4286 If you have used this plugin with other models and/or software version, feel
4287 free to send us a mail to tell us about the results, even if it's just a short
4290 To collect these data collectd will log in to the NetApp via HTTP(S) and HTTP
4291 basic authentication.
4293 B<Do not use a regular user for this!> Create a special collectd user with just
4294 the minimum of capabilities needed. The user only needs the "login-http-admin"
4295 capability as well as a few more depending on which data will be collected.
4296 Required capabilities are documented below.
4301 <Host "netapp1.example.com">
4325 IgnoreSelectedIO false
4327 IgnoreSelectedOps false
4328 GetLatency "volume0"
4329 IgnoreSelectedLatency false
4336 IgnoreSelectedCapacity false
4339 IgnoreSelectedSnapshot false
4367 The netapp plugin accepts the following configuration options:
4371 =item B<Host> I<Name>
4373 A host block defines one NetApp filer. It will appear in collectd with the name
4374 you specify here which does not have to be its real name nor its hostname (see
4375 the B<Address> option below).
4377 =item B<VFiler> I<Name>
4379 A B<VFiler> block may only be used inside a host block. It accepts all the
4380 same options as the B<Host> block (except for cascaded B<VFiler> blocks) and
4381 will execute all NetApp API commands in the context of the specified
4382 VFiler(R). It will appear in collectd with the name you specify here which
4383 does not have to be its real name. The VFiler name may be specified using the
4384 B<VFilerName> option. If this is not specified, it will default to the name
4387 The VFiler block inherits all connection related settings from the surrounding
4388 B<Host> block (which appear before the B<VFiler> block) but they may be
4389 overwritten inside the B<VFiler> block.
4391 This feature is useful, for example, when using a VFiler as SnapVault target
4392 (supported since OnTap 8.1). In that case, the SnapVault statistics are not
4393 available in the host filer (vfiler0) but only in the respective VFiler
4396 =item B<Protocol> B<httpd>|B<http>
4398 The protocol collectd will use to query this host.
4406 Valid options: http, https
4408 =item B<Address> I<Address>
4410 The hostname or IP address of the host.
4416 Default: The "host" block's name.
4418 =item B<Port> I<Port>
4420 The TCP port to connect to on the host.
4426 Default: 80 for protocol "http", 443 for protocol "https"
4428 =item B<User> I<User>
4430 =item B<Password> I<Password>
4432 The username and password to use to login to the NetApp.
4438 =item B<VFilerName> I<Name>
4440 The name of the VFiler in which context to execute API commands. If not
4441 specified, the name provided to the B<VFiler> block will be used instead.
4447 Default: name of the B<VFiler> block
4449 B<Note:> This option may only be used inside B<VFiler> blocks.
4451 =item B<Interval> I<Interval>
4457 The following options decide what kind of data will be collected. You can
4458 either use them as a block and fine tune various parameters inside this block,
4459 use them as a single statement to just accept all default values, or omit it to
4460 not collect any data.
4462 The following options are valid inside all blocks:
4466 =item B<Interval> I<Seconds>
4468 Collect the respective statistics every I<Seconds> seconds. Defaults to the
4469 host specific setting.
4473 =head3 The System block
4475 This will collect various performance data about the whole system.
4477 B<Note:> To get this data the collectd user needs the
4478 "api-perf-object-get-instances" capability.
4482 =item B<Interval> I<Seconds>
4484 Collect disk statistics every I<Seconds> seconds.
4486 =item B<GetCPULoad> B<true>|B<false>
4488 If you set this option to true the current CPU usage will be read. This will be
4489 the average usage between all CPUs in your NetApp without any information about
4492 B<Note:> These are the same values that the NetApp CLI command "sysstat"
4493 returns in the "CPU" field.
4501 Result: Two value lists of type "cpu", and type instances "idle" and "system".
4503 =item B<GetInterfaces> B<true>|B<false>
4505 If you set this option to true the current traffic of the network interfaces
4506 will be read. This will be the total traffic over all interfaces of your NetApp
4507 without any information about individual interfaces.
4509 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4510 in the "Net kB/s" field.
4520 Result: One value list of type "if_octects".
4522 =item B<GetDiskIO> B<true>|B<false>
4524 If you set this option to true the current IO throughput will be read. This
4525 will be the total IO of your NetApp without any information about individual
4526 disks, volumes or aggregates.
4528 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4529 in the "DiskE<nbsp>kB/s" field.
4537 Result: One value list of type "disk_octets".
4539 =item B<GetDiskOps> B<true>|B<false>
4541 If you set this option to true the current number of HTTP, NFS, CIFS, FCP,
4542 iSCSI, etc. operations will be read. This will be the total number of
4543 operations on your NetApp without any information about individual volumes or
4546 B<Note:> These are the same values that the NetApp CLI command "sysstat"
4547 returns in the "NFS", "CIFS", "HTTP", "FCP" and "iSCSI" fields.
4555 Result: A variable number of value lists of type "disk_ops_complex". Each type
4556 of operation will result in one value list with the name of the operation as
4561 =head3 The WAFL block
4563 This will collect various performance data about the WAFL file system. At the
4564 moment this just means cache performance.
4566 B<Note:> To get this data the collectd user needs the
4567 "api-perf-object-get-instances" capability.
4569 B<Note:> The interface to get these values is classified as "Diagnostics" by
4570 NetApp. This means that it is not guaranteed to be stable even between minor
4575 =item B<Interval> I<Seconds>
4577 Collect disk statistics every I<Seconds> seconds.
4579 =item B<GetNameCache> B<true>|B<false>
4587 Result: One value list of type "cache_ratio" and type instance
4590 =item B<GetDirCache> B<true>|B<false>
4598 Result: One value list of type "cache_ratio" and type instance "find_dir_hit".
4600 =item B<GetInodeCache> B<true>|B<false>
4608 Result: One value list of type "cache_ratio" and type instance
4611 =item B<GetBufferCache> B<true>|B<false>
4613 B<Note:> This is the same value that the NetApp CLI command "sysstat" returns
4614 in the "Cache hit" field.
4622 Result: One value list of type "cache_ratio" and type instance "buf_hash_hit".
4626 =head3 The Disks block
4628 This will collect performance data about the individual disks in the NetApp.
4630 B<Note:> To get this data the collectd user needs the
4631 "api-perf-object-get-instances" capability.
4635 =item B<Interval> I<Seconds>
4637 Collect disk statistics every I<Seconds> seconds.
4639 =item B<GetBusy> B<true>|B<false>
4641 If you set this option to true the busy time of all disks will be calculated
4642 and the value of the busiest disk in the system will be written.
4644 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4645 in the "Disk util" field. Probably.
4653 Result: One value list of type "percent" and type instance "disk_busy".
4657 =head3 The VolumePerf block
4659 This will collect various performance data about the individual volumes.
4661 You can select which data to collect about which volume using the following
4662 options. They follow the standard ignorelist semantic.
4664 B<Note:> To get this data the collectd user needs the
4665 I<api-perf-object-get-instances> capability.
4669 =item B<Interval> I<Seconds>
4671 Collect volume performance data every I<Seconds> seconds.
4673 =item B<GetIO> I<Volume>
4675 =item B<GetOps> I<Volume>
4677 =item B<GetLatency> I<Volume>
4679 Select the given volume for IO, operations or latency statistics collection.
4680 The argument is the name of the volume without the C</vol/> prefix.
4682 Since the standard ignorelist functionality is used here, you can use a string
4683 starting and ending with a slash to specify regular expression matching: To
4684 match the volumes "vol0", "vol2" and "vol7", you can use this regular
4687 GetIO "/^vol[027]$/"
4689 If no regular expression is specified, an exact match is required. Both,
4690 regular and exact matching are case sensitive.
4692 If no volume was specified at all for either of the three options, that data
4693 will be collected for all available volumes.
4695 See F</"IGNORELISTS"> for details.
4697 =item B<IgnoreSelectedIO> B<true>|B<false>
4699 =item B<IgnoreSelectedOps> B<true>|B<false>
4701 =item B<IgnoreSelectedLatency> B<true>|B<false>
4703 When set to B<true>, the volumes selected for IO, operations or latency
4704 statistics collection will be ignored and the data will be collected for all
4707 When set to B<false>, data will only be collected for the specified volumes and
4708 all other volumes will be ignored.
4710 If no volumes have been specified with the above B<Get*> options, all volumes
4711 will be collected regardless of the B<IgnoreSelected*> option.
4713 Defaults to B<false>
4717 =head3 The VolumeUsage block
4719 This will collect capacity data about the individual volumes.
4721 B<Note:> To get this data the collectd user needs the I<api-volume-list-info>
4726 =item B<Interval> I<Seconds>
4728 Collect volume usage statistics every I<Seconds> seconds.
4730 =item B<GetCapacity> I<VolumeName>
4732 The current capacity of the volume will be collected. This will result in two
4733 to four value lists, depending on the configuration of the volume. All data
4734 sources are of type "df_complex" with the name of the volume as
4737 There will be type_instances "used" and "free" for the number of used and
4738 available bytes on the volume. If the volume has some space reserved for
4739 snapshots, a type_instance "snap_reserved" will be available. If the volume
4740 has SIS enabled, a type_instance "sis_saved" will be available. This is the
4741 number of bytes saved by the SIS feature.
4743 B<Note:> The current NetApp API has a bug that results in this value being
4744 reported as a 32E<nbsp>bit number. This plugin tries to guess the correct
4745 number which works most of the time. If you see strange values here, bug
4746 NetApp support to fix this.
4748 Repeat this option to specify multiple volumes.
4750 =item B<IgnoreSelectedCapacity> B<true>|B<false>
4752 Specify whether to collect only the volumes selected by the B<GetCapacity>
4753 option or to ignore those volumes. B<IgnoreSelectedCapacity> defaults to
4754 B<false>. However, if no B<GetCapacity> option is specified at all, all
4755 capacities will be selected anyway.
4757 =item B<GetSnapshot> I<VolumeName>
4759 Select volumes from which to collect snapshot information.
4761 Usually, the space used for snapshots is included in the space reported as
4762 "used". If snapshot information is collected as well, the space used for
4763 snapshots is subtracted from the used space.
4765 To make things even more interesting, it is possible to reserve space to be
4766 used for snapshots. If the space required for snapshots is less than that
4767 reserved space, there is "reserved free" and "reserved used" space in addition
4768 to "free" and "used". If the space required for snapshots exceeds the reserved
4769 space, that part allocated in the normal space is subtracted from the "used"
4772 Repeat this option to specify multiple volumes.
4774 =item B<IgnoreSelectedSnapshot>
4776 Specify whether to collect only the volumes selected by the B<GetSnapshot>
4777 option or to ignore those volumes. B<IgnoreSelectedSnapshot> defaults to
4778 B<false>. However, if no B<GetSnapshot> option is specified at all, all
4779 capacities will be selected anyway.
4783 =head3 The Quota block
4785 This will collect (tree) quota statistics (used disk space and number of used
4786 files). This mechanism is useful to get usage information for single qtrees.
4787 In case the quotas are not used for any other purpose, an entry similar to the
4788 following in C</etc/quotas> would be sufficient:
4790 /vol/volA/some_qtree tree - - - - -
4792 After adding the entry, issue C<quota on -w volA> on the NetApp filer.
4796 =item B<Interval> I<Seconds>
4798 Collect SnapVault(R) statistics every I<Seconds> seconds.
4802 =head3 The SnapVault block
4804 This will collect statistics about the time and traffic of SnapVault(R)
4809 =item B<Interval> I<Seconds>
4811 Collect SnapVault(R) statistics every I<Seconds> seconds.
4815 =head2 Plugin C<netlink>
4817 The C<netlink> plugin uses a netlink socket to query the Linux kernel about
4818 statistics of various interface and routing aspects.
4822 =item B<Interface> I<Interface>
4824 =item B<VerboseInterface> I<Interface>
4826 Instruct the plugin to collect interface statistics. This is basically the same
4827 as the statistics provided by the C<interface> plugin (see above) but
4828 potentially much more detailed.
4830 When configuring with B<Interface> only the basic statistics will be collected,
4831 namely octets, packets, and errors. These statistics are collected by
4832 the C<interface> plugin, too, so using both at the same time is no benefit.
4834 When configured with B<VerboseInterface> all counters B<except> the basic ones,
4835 so that no data needs to be collected twice if you use the C<interface> plugin.
4836 This includes dropped packets, received multicast packets, collisions and a
4837 whole zoo of differentiated RX and TX errors. You can try the following command
4838 to get an idea of what awaits you:
4842 If I<Interface> is B<All>, all interfaces will be selected.
4844 =item B<QDisc> I<Interface> [I<QDisc>]
4846 =item B<Class> I<Interface> [I<Class>]
4848 =item B<Filter> I<Interface> [I<Filter>]
4850 Collect the octets and packets that pass a certain qdisc, class or filter.
4852 QDiscs and classes are identified by their type and handle (or classid).
4853 Filters don't necessarily have a handle, therefore the parent's handle is used.
4854 The notation used in collectd differs from that used in tc(1) in that it
4855 doesn't skip the major or minor number if it's zero and doesn't print special
4856 ids by their name. So, for example, a qdisc may be identified by
4857 C<pfifo_fast-1:0> even though the minor number of B<all> qdiscs is zero and
4858 thus not displayed by tc(1).
4860 If B<QDisc>, B<Class>, or B<Filter> is given without the second argument,
4861 i.E<nbsp>.e. without an identifier, all qdiscs, classes, or filters that are
4862 associated with that interface will be collected.
4864 Since a filter itself doesn't necessarily have a handle, the parent's handle is
4865 used. This may lead to problems when more than one filter is attached to a
4866 qdisc or class. This isn't nice, but we don't know how this could be done any
4867 better. If you have a idea, please don't hesitate to tell us.
4869 As with the B<Interface> option you can specify B<All> as the interface,
4870 meaning all interfaces.
4872 Here are some examples to help you understand the above text more easily:
4875 VerboseInterface "All"
4876 QDisc "eth0" "pfifo_fast-1:0"
4878 Class "ppp0" "htb-1:10"
4879 Filter "ppp0" "u32-1:0"
4882 See F</"IGNORELISTS"> for details.
4884 =item B<IgnoreSelected>
4886 The behavior is the same as with all other similar plugins: If nothing is
4887 selected at all, everything is collected. If some things are selected using the
4888 options described above, only these statistics are collected. If you set
4889 B<IgnoreSelected> to B<true>, this behavior is inverted, i.E<nbsp>e. the
4890 specified statistics will not be collected.
4894 =head2 Plugin C<network>
4896 The Network plugin sends data to a remote instance of collectd, receives data
4897 from a remote instance, or both at the same time. Data which has been received
4898 from the network is usually not transmitted again, but this can be activated, see
4899 the B<Forward> option below.
4901 The default IPv6 multicast group is C<ff18::efc0:4a42>. The default IPv4
4902 multicast group is C<239.192.74.66>. The default I<UDP> port is B<25826>.
4904 Both, B<Server> and B<Listen> can be used as single option or as block. When
4905 used as block, given options are valid for this socket only. The following
4906 example will export the metrics twice: Once to an "internal" server (without
4907 encryption and signing) and one to an external server (with cryptographic
4911 # Export to an internal server
4912 # (demonstrates usage without additional options)
4913 Server "collectd.internal.tld"
4915 # Export to an external server
4916 # (demonstrates usage with signature options)
4917 <Server "collectd.external.tld">
4918 SecurityLevel "sign"
4919 Username "myhostname"
4926 =item B<E<lt>Server> I<Host> [I<Port>]B<E<gt>>
4928 The B<Server> statement/block sets the server to send datagrams to. The
4929 statement may occur multiple times to send each datagram to multiple
4932 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. The
4933 optional second argument specifies a port number or a service name. If not
4934 given, the default, B<25826>, is used.
4936 The following options are recognized within B<Server> blocks:
4940 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
4942 Set the security you require for network communication. When the security level
4943 has been set to B<Encrypt>, data sent over the network will be encrypted using
4944 I<AES-256>. The integrity of encrypted packets is ensured using I<SHA-1>. When
4945 set to B<Sign>, transmitted data is signed using the I<HMAC-SHA-256> message
4946 authentication code. When set to B<None>, data is sent without any security.
4948 This feature is only available if the I<network> plugin was linked with
4951 =item B<Username> I<Username>
4953 Sets the username to transmit. This is used by the server to lookup the
4954 password. See B<AuthFile> below. All security levels except B<None> require
4957 This feature is only available if the I<network> plugin was linked with
4960 =item B<Password> I<Password>
4962 Sets a password (shared secret) for this socket. All security levels except
4963 B<None> require this setting.
4965 This feature is only available if the I<network> plugin was linked with
4968 =item B<Interface> I<Interface name>
4970 Set the outgoing interface for IP packets. This applies at least
4971 to IPv6 packets and if possible to IPv4. If this option is not applicable,
4972 undefined or a non-existent interface name is specified, the default
4973 behavior is to let the kernel choose the appropriate interface. Be warned
4974 that the manual selection of an interface for unicast traffic is only
4975 necessary in rare cases.
4977 =item B<ResolveInterval> I<Seconds>
4979 Sets the interval at which to re-resolve the DNS for the I<Host>. This is
4980 useful to force a regular DNS lookup to support a high availability setup. If
4981 not specified, re-resolves are never attempted.
4985 =item B<E<lt>Listen> I<Host> [I<Port>]B<E<gt>>
4987 The B<Listen> statement sets the interfaces to bind to. When multiple
4988 statements are found the daemon will bind to multiple interfaces.
4990 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. If
4991 the argument is a multicast address the daemon will join that multicast group.
4992 The optional second argument specifies a port number or a service name. If not
4993 given, the default, B<25826>, is used.
4995 The following options are recognized within C<E<lt>ListenE<gt>> blocks:
4999 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
5001 Set the security you require for network communication. When the security level
5002 has been set to B<Encrypt>, only encrypted data will be accepted. The integrity
5003 of encrypted packets is ensured using I<SHA-1>. When set to B<Sign>, only
5004 signed and encrypted data is accepted. When set to B<None>, all data will be
5005 accepted. If an B<AuthFile> option was given (see below), encrypted data is
5006 decrypted if possible.
5008 This feature is only available if the I<network> plugin was linked with
5011 =item B<AuthFile> I<Filename>
5013 Sets a file in which usernames are mapped to passwords. These passwords are
5014 used to verify signatures and to decrypt encrypted network packets. If
5015 B<SecurityLevel> is set to B<None>, this is optional. If given, signed data is
5016 verified and encrypted packets are decrypted. Otherwise, signed data is
5017 accepted without checking the signature and encrypted data cannot be decrypted.
5018 For the other security levels this option is mandatory.
5020 The file format is very simple: Each line consists of a username followed by a
5021 colon and any number of spaces followed by the password. To demonstrate, an
5022 example file could look like this:
5027 Each time a packet is received, the modification time of the file is checked
5028 using L<stat(2)>. If the file has been changed, the contents is re-read. While
5029 the file is being read, it is locked using L<fcntl(2)>.
5031 =item B<Interface> I<Interface name>
5033 Set the incoming interface for IP packets explicitly. This applies at least
5034 to IPv6 packets and if possible to IPv4. If this option is not applicable,
5035 undefined or a non-existent interface name is specified, the default
5036 behavior is, to let the kernel choose the appropriate interface. Thus incoming
5037 traffic gets only accepted, if it arrives on the given interface.
5041 =item B<TimeToLive> I<1-255>
5043 Set the time-to-live of sent packets. This applies to all, unicast and
5044 multicast, and IPv4 and IPv6 packets. The default is to not change this value.
5045 That means that multicast packets will be sent with a TTL of C<1> (one) on most
5048 =item B<MaxPacketSize> I<1024-65535>
5050 Set the maximum size for datagrams received over the network. Packets larger
5051 than this will be truncated. Defaults to 1452E<nbsp>bytes, which is the maximum
5052 payload size that can be transmitted in one Ethernet frame using IPv6E<nbsp>/
5055 On the server side, this limit should be set to the largest value used on
5056 I<any> client. Likewise, the value on the client must not be larger than the
5057 value on the server, or data will be lost.
5059 B<Compatibility:> Versions prior to I<versionE<nbsp>4.8> used a fixed sized
5060 buffer of 1024E<nbsp>bytes. Versions I<4.8>, I<4.9> and I<4.10> used a default
5061 value of 1024E<nbsp>bytes to avoid problems when sending data to an older
5064 =item B<Forward> I<true|false>
5066 If set to I<true>, write packets that were received via the network plugin to
5067 the sending sockets. This should only be activated when the B<Listen>- and
5068 B<Server>-statements differ. Otherwise packets may be send multiple times to
5069 the same multicast group. While this results in more network traffic than
5070 necessary it's not a huge problem since the plugin has a duplicate detection,
5071 so the values will not loop.
5073 =item B<ReportStats> B<true>|B<false>
5075 The network plugin cannot only receive and send statistics, it can also create
5076 statistics about itself. Collectd data included the number of received and
5077 sent octets and packets, the length of the receive queue and the number of
5078 values handled. When set to B<true>, the I<Network plugin> will make these
5079 statistics available. Defaults to B<false>.
5083 =head2 Plugin C<nginx>
5085 This plugin collects the number of connections and requests handled by the
5086 C<nginx daemon> (speak: engineE<nbsp>X), a HTTP and mail server/proxy. It
5087 queries the page provided by the C<ngx_http_stub_status_module> module, which
5088 isn't compiled by default. Please refer to
5089 L<http://wiki.codemongers.com/NginxStubStatusModule> for more information on
5090 how to compile and configure nginx and this module.
5092 The following options are accepted by the C<nginx plugin>:
5096 =item B<URL> I<http://host/nginx_status>
5098 Sets the URL of the C<ngx_http_stub_status_module> output.
5100 =item B<User> I<Username>
5102 Optional user name needed for authentication.
5104 =item B<Password> I<Password>
5106 Optional password needed for authentication.
5108 =item B<VerifyPeer> B<true|false>
5110 Enable or disable peer SSL certificate verification. See
5111 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
5113 =item B<VerifyHost> B<true|false>
5115 Enable or disable peer host name verification. If enabled, the plugin checks
5116 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
5117 certificate matches the host name provided by the B<URL> option. If this
5118 identity check fails, the connection is aborted. Obviously, only works when
5119 connecting to a SSL enabled server. Enabled by default.
5121 =item B<CACert> I<File>
5123 File that holds one or more SSL certificates. If you want to use HTTPS you will
5124 possibly need this option. What CA certificates come bundled with C<libcurl>
5125 and are checked by default depends on the distribution you use.
5127 =item B<Timeout> I<Milliseconds>
5129 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
5130 milliseconds. By default, the configured B<Interval> is used to set the
5135 =head2 Plugin C<notify_desktop>
5137 This plugin sends a desktop notification to a notification daemon, as defined
5138 in the Desktop Notification Specification. To actually display the
5139 notifications, B<notification-daemon> is required and B<collectd> has to be
5140 able to access the X server (i.E<nbsp>e., the C<DISPLAY> and C<XAUTHORITY>
5141 environment variables have to be set correctly) and the D-Bus message bus.
5143 The Desktop Notification Specification can be found at
5144 L<http://www.galago-project.org/specs/notification/>.
5148 =item B<OkayTimeout> I<timeout>
5150 =item B<WarningTimeout> I<timeout>
5152 =item B<FailureTimeout> I<timeout>
5154 Set the I<timeout>, in milliseconds, after which to expire the notification
5155 for C<OKAY>, C<WARNING> and C<FAILURE> severities respectively. If zero has
5156 been specified, the displayed notification will not be closed at all - the
5157 user has to do so herself. These options default to 5000. If a negative number
5158 has been specified, the default is used as well.
5162 =head2 Plugin C<notify_email>
5164 The I<notify_email> plugin uses the I<ESMTP> library to send notifications to a
5165 configured email address.
5167 I<libESMTP> is available from L<http://www.stafford.uklinux.net/libesmtp/>.
5169 Available configuration options:
5173 =item B<From> I<Address>
5175 Email address from which the emails should appear to come from.
5177 Default: C<root@localhost>
5179 =item B<Recipient> I<Address>
5181 Configures the email address(es) to which the notifications should be mailed.
5182 May be repeated to send notifications to multiple addresses.
5184 At least one B<Recipient> must be present for the plugin to work correctly.
5186 =item B<SMTPServer> I<Hostname>
5188 Hostname of the SMTP server to connect to.
5190 Default: C<localhost>
5192 =item B<SMTPPort> I<Port>
5194 TCP port to connect to.
5198 =item B<SMTPUser> I<Username>
5200 Username for ASMTP authentication. Optional.
5202 =item B<SMTPPassword> I<Password>
5204 Password for ASMTP authentication. Optional.
5206 =item B<Subject> I<Subject>
5208 Subject-template to use when sending emails. There must be exactly two
5209 string-placeholders in the subject, given in the standard I<printf(3)> syntax,
5210 i.E<nbsp>e. C<%s>. The first will be replaced with the severity, the second
5213 Default: C<Collectd notify: %s@%s>
5217 =head2 Plugin C<notify_nagios>
5219 The I<notify_nagios> plugin writes notifications to Nagios' I<command file> as
5220 a I<passive service check result>.
5222 Available configuration options:
5226 =item B<CommandFile> I<Path>
5228 Sets the I<command file> to write to. Defaults to F</usr/local/nagios/var/rw/nagios.cmd>.
5232 =head2 Plugin C<ntpd>
5234 The C<ntpd> plugin collects per-peer ntp data such as time offset and time
5237 For talking to B<ntpd>, it mimics what the B<ntpdc> control program does on
5238 the wire - using B<mode 7> specific requests. This mode is deprecated with
5239 newer B<ntpd> releases (4.2.7p230 and later). For the C<ntpd> plugin to work
5240 correctly with them, the ntp daemon must be explicitly configured to
5241 enable B<mode 7> (which is disabled by default). Refer to the I<ntp.conf(5)>
5242 manual page for details.
5244 Available configuration options for the C<ntpd> plugin:
5248 =item B<Host> I<Hostname>
5250 Hostname of the host running B<ntpd>. Defaults to B<localhost>.
5252 =item B<Port> I<Port>
5254 UDP-Port to connect to. Defaults to B<123>.
5256 =item B<ReverseLookups> B<true>|B<false>
5258 Sets whether or not to perform reverse lookups on peers. Since the name or
5259 IP-address may be used in a filename it is recommended to disable reverse
5260 lookups. The default is to do reverse lookups to preserve backwards
5261 compatibility, though.
5263 =item B<IncludeUnitID> B<true>|B<false>
5265 When a peer is a refclock, include the unit ID in the I<type instance>.
5266 Defaults to B<false> for backward compatibility.
5268 If two refclock peers use the same driver and this is B<false>, the plugin will
5269 try to write simultaneous measurements from both to the same type instance.
5270 This will result in error messages in the log and only one set of measurements
5275 =head2 Plugin C<nut>
5279 =item B<UPS> I<upsname>B<@>I<hostname>[B<:>I<port>]
5281 Add a UPS to collect data from. The format is identical to the one accepted by
5284 =item B<ForceSSL> B<true>|B<false>
5286 Stops connections from falling back to unsecured if an SSL connection
5287 cannot be established. Defaults to false if undeclared.
5289 =item B<VerifyPeer> I<true>|I<false>
5291 If set to true, requires a CAPath be provided. Will use the CAPath to find
5292 certificates to use as Trusted Certificates to validate a upsd server certificate.
5293 If validation of the upsd server certificate fails, the connection will not be
5294 established. If ForceSSL is undeclared or set to false, setting VerifyPeer to true
5295 will override and set ForceSSL to true.
5297 =item B<CAPath> I/path/to/certs/folder
5299 If VerifyPeer is set to true, this is required. Otherwise this is ignored.
5300 The folder pointed at must contain certificate(s) named according to their hash.
5301 Ex: XXXXXXXX.Y where X is the hash value of a cert and Y is 0. If name collisions
5302 occur because two different certs have the same hash value, Y can be incremented
5303 in order to avoid conflict. To create a symbolic link to a certificate the following
5304 command can be used from within the directory where the cert resides:
5306 C<ln -s some.crt ./$(openssl x509 -hash -noout -in some.crt).0>
5308 Alternatively, the package openssl-perl provides a command C<c_rehash> that will
5309 generate links like the one described above for ALL certs in a given folder.
5311 C<c_rehash /path/to/certs/folder>
5315 =head2 Plugin C<olsrd>
5317 The I<olsrd> plugin connects to the TCP port opened by the I<txtinfo> plugin of
5318 the Optimized Link State Routing daemon and reads information about the current
5319 state of the meshed network.
5321 The following configuration options are understood:
5325 =item B<Host> I<Host>
5327 Connect to I<Host>. Defaults to B<"localhost">.
5329 =item B<Port> I<Port>
5331 Specifies the port to connect to. This must be a string, even if you give the
5332 port as a number rather than a service name. Defaults to B<"2006">.
5334 =item B<CollectLinks> B<No>|B<Summary>|B<Detail>
5336 Specifies what information to collect about links, i.E<nbsp>e. direct
5337 connections of the daemon queried. If set to B<No>, no information is
5338 collected. If set to B<Summary>, the number of links and the average of all
5339 I<link quality> (LQ) and I<neighbor link quality> (NLQ) values is calculated.
5340 If set to B<Detail> LQ and NLQ are collected per link.
5342 Defaults to B<Detail>.
5344 =item B<CollectRoutes> B<No>|B<Summary>|B<Detail>
5346 Specifies what information to collect about routes of the daemon queried. If
5347 set to B<No>, no information is collected. If set to B<Summary>, the number of
5348 routes and the average I<metric> and I<ETX> is calculated. If set to B<Detail>
5349 metric and ETX are collected per route.
5351 Defaults to B<Summary>.
5353 =item B<CollectTopology> B<No>|B<Summary>|B<Detail>
5355 Specifies what information to collect about the global topology. If set to
5356 B<No>, no information is collected. If set to B<Summary>, the number of links
5357 in the entire topology and the average I<link quality> (LQ) is calculated.
5358 If set to B<Detail> LQ and NLQ are collected for each link in the entire topology.
5360 Defaults to B<Summary>.
5364 =head2 Plugin C<onewire>
5366 B<EXPERIMENTAL!> See notes below.
5368 The C<onewire> plugin uses the B<owcapi> library from the B<owfs> project
5369 L<http://owfs.org/> to read sensors connected via the onewire bus.
5371 It can be used in two possible modes - standard or advanced.
5373 In the standard mode only temperature sensors (sensors with the family code
5374 C<10>, C<22> and C<28> - e.g. DS1820, DS18S20, DS1920) can be read. If you have
5375 other sensors you would like to have included, please send a sort request to
5376 the mailing list. You can select sensors to be read or to be ignored depending
5377 on the option B<IgnoreSelected>). When no list is provided the whole bus is
5378 walked and all sensors are read.
5380 Hubs (the DS2409 chips) are working, but read the note, why this plugin is
5381 experimental, below.
5383 In the advanced mode you can configure any sensor to be read (only numerical
5384 value) using full OWFS path (e.g. "/uncached/10.F10FCA000800/temperature").
5385 In this mode you have to list all the sensors. Neither default bus walk nor
5386 B<IgnoreSelected> are used here. Address and type (file) is extracted from
5387 the path automatically and should produce compatible structure with the "standard"
5388 mode (basically the path is expected as for example
5389 "/uncached/10.F10FCA000800/temperature" where it would extract address part
5390 "F10FCA000800" and the rest after the slash is considered the type - here
5392 There are two advantages to this mode - you can access virtually any sensor
5393 (not just temperature), select whether to use cached or directly read values
5394 and it is slighlty faster. The downside is more complex configuration.
5396 The two modes are distinguished automatically by the format of the address.
5397 It is not possible to mix the two modes. Once a full path is detected in any
5398 B<Sensor> then the whole addressing (all sensors) is considered to be this way
5399 (and as standard addresses will fail parsing they will be ignored).
5403 =item B<Device> I<Device>
5405 Sets the device to read the values from. This can either be a "real" hardware
5406 device, such as a serial port or an USB port, or the address of the
5407 L<owserver(1)> socket, usually B<localhost:4304>.
5409 Though the documentation claims to automatically recognize the given address
5410 format, with versionE<nbsp>2.7p4 we had to specify the type explicitly. So
5411 with that version, the following configuration worked for us:
5414 Device "-s localhost:4304"
5417 This directive is B<required> and does not have a default value.
5419 =item B<Sensor> I<Sensor>
5421 In the standard mode selects sensors to collect or to ignore
5422 (depending on B<IgnoreSelected>, see below). Sensors are specified without
5423 the family byte at the beginning, so you have to use for example C<F10FCA000800>,
5424 and B<not> include the leading C<10.> family byte and point.
5425 When no B<Sensor> is configured the whole Onewire bus is walked and all supported
5426 sensors (see above) are read.
5428 In the advanced mode the B<Sensor> specifies full OWFS path - e.g.
5429 C</uncached/10.F10FCA000800/temperature> (or when cached values are OK
5430 C</10.F10FCA000800/temperature>). B<IgnoreSelected> is not used.
5432 As there can be multiple devices on the bus you can list multiple sensor (use
5433 multiple B<Sensor> elements).
5435 See F</"IGNORELISTS"> for details.
5437 =item B<IgnoreSelected> I<true>|I<false>
5439 If no configuration is given, the B<onewire> plugin will collect data from all
5440 sensors found. This may not be practical, especially if sensors are added and
5441 removed regularly. Sometimes, however, it's easier/preferred to collect only
5442 specific sensors or all sensors I<except> a few specified ones. This option
5443 enables you to do that: By setting B<IgnoreSelected> to I<true> the effect of
5444 B<Sensor> is inverted: All selected interfaces are ignored and all other
5445 interfaces are collected.
5447 Used only in the standard mode - see above.
5449 =item B<Interval> I<Seconds>
5451 Sets the interval in which all sensors should be read. If not specified, the
5452 global B<Interval> setting is used.
5456 B<EXPERIMENTAL!> The C<onewire> plugin is experimental, because it doesn't yet
5457 work with big setups. It works with one sensor being attached to one
5458 controller, but as soon as you throw in a couple more senors and maybe a hub
5459 or two, reading all values will take more than ten seconds (the default
5460 interval). We will probably add some separate thread for reading the sensors
5461 and some cache or something like that, but it's not done yet. We will try to
5462 maintain backwards compatibility in the future, but we can't promise. So in
5463 short: If it works for you: Great! But keep in mind that the config I<might>
5464 change, though this is unlikely. Oh, and if you want to help improving this
5465 plugin, just send a short notice to the mailing list. ThanksE<nbsp>:)
5467 =head2 Plugin C<openldap>
5469 To use the C<openldap> plugin you first need to configure the I<OpenLDAP>
5470 server correctly. The backend database C<monitor> needs to be loaded and
5471 working. See slapd-monitor(5) for the details.
5473 The configuration of the C<openldap> plugin consists of one or more B<Instance>
5474 blocks. Each block requires one string argument as the instance name. For
5479 URL "ldap://localhost/"
5482 URL "ldaps://localhost/"
5486 The instance name will be used as the I<plugin instance>. To emulate the old
5487 (versionE<nbsp>4) behavior, you can use an empty string (""). In order for the
5488 plugin to work correctly, each instance name must be unique. This is not
5489 enforced by the plugin and it is your responsibility to ensure it is.
5491 The following options are accepted within each B<Instance> block:
5495 =item B<URL> I<ldap://host/binddn>
5497 Sets the URL to use to connect to the I<OpenLDAP> server. This option is
5500 =item B<BindDN> I<BindDN>
5502 Name in the form of an LDAP distinguished name intended to be used for
5503 authentication. Defaults to empty string to establish an anonymous authorization.
5505 =item B<Password> I<Password>
5507 Password for simple bind authentication. If this option is not set,
5508 unauthenticated bind operation is used.
5510 =item B<StartTLS> B<true|false>
5512 Defines whether TLS must be used when connecting to the I<OpenLDAP> server.
5513 Disabled by default.
5515 =item B<VerifyHost> B<true|false>
5517 Enables or disables peer host name verification. If enabled, the plugin checks
5518 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
5519 certificate matches the host name provided by the B<URL> option. If this
5520 identity check fails, the connection is aborted. Enabled by default.
5522 =item B<CACert> I<File>
5524 File that holds one or more SSL certificates. If you want to use TLS/SSL you
5525 may possibly need this option. What CA certificates are checked by default
5526 depends on the distribution you use and can be changed with the usual ldap
5527 client configuration mechanisms. See ldap.conf(5) for the details.
5529 =item B<Timeout> I<Seconds>
5531 Sets the timeout value for ldap operations, in seconds. By default, the
5532 configured B<Interval> is used to set the timeout. Use B<-1> to disable
5535 =item B<Version> I<Version>
5537 An integer which sets the LDAP protocol version number to use when connecting
5538 to the I<OpenLDAP> server. Defaults to B<3> for using I<LDAPv3>.
5542 =head2 Plugin C<openvpn>
5544 The OpenVPN plugin reads a status file maintained by OpenVPN and gathers
5545 traffic statistics about connected clients.
5547 To set up OpenVPN to write to the status file periodically, use the
5548 B<--status> option of OpenVPN. Since OpenVPN can write two different formats,
5549 you need to set the required format, too. This is done by setting
5550 B<--status-version> to B<2>.
5552 So, in a nutshell you need:
5554 openvpn $OTHER_OPTIONS \
5555 --status "/var/run/openvpn-status" 10 \
5562 =item B<StatusFile> I<File>
5564 Specifies the location of the status file.
5566 =item B<ImprovedNamingSchema> B<true>|B<false>
5568 When enabled, the filename of the status file will be used as plugin instance
5569 and the client's "common name" will be used as type instance. This is required
5570 when reading multiple status files. Enabling this option is recommended, but to
5571 maintain backwards compatibility this option is disabled by default.
5573 =item B<CollectCompression> B<true>|B<false>
5575 Sets whether or not statistics about the compression used by OpenVPN should be
5576 collected. This information is only available in I<single> mode. Enabled by
5579 =item B<CollectIndividualUsers> B<true>|B<false>
5581 Sets whether or not traffic information is collected for each connected client
5582 individually. If set to false, currently no traffic data is collected at all
5583 because aggregating this data in a save manner is tricky. Defaults to B<true>.
5585 =item B<CollectUserCount> B<true>|B<false>
5587 When enabled, the number of currently connected clients or users is collected.
5588 This is especially interesting when B<CollectIndividualUsers> is disabled, but
5589 can be configured independently from that option. Defaults to B<false>.
5593 =head2 Plugin C<oracle>
5595 The "oracle" plugin uses the Oracle® Call Interface I<(OCI)> to connect to an
5596 Oracle® Database and lets you execute SQL statements there. It is very similar
5597 to the "dbi" plugin, because it was written around the same time. See the "dbi"
5598 plugin's documentation above for details.
5601 <Query "out_of_stock">
5602 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
5605 # InstancePrefix "foo"
5606 InstancesFrom "category"
5610 <Database "product_information">
5614 Query "out_of_stock"
5618 =head3 B<Query> blocks
5620 The Query blocks are handled identically to the Query blocks of the "dbi"
5621 plugin. Please see its documentation above for details on how to specify
5624 =head3 B<Database> blocks
5626 Database blocks define a connection to a database and which queries should be
5627 sent to that database. Each database needs a "name" as string argument in the
5628 starting tag of the block. This name will be used as "PluginInstance" in the
5629 values submitted to the daemon. Other than that, that name is not used.
5633 =item B<ConnectID> I<ID>
5635 Defines the "database alias" or "service name" to connect to. Usually, these
5636 names are defined in the file named C<$ORACLE_HOME/network/admin/tnsnames.ora>.
5638 =item B<Host> I<Host>
5640 Hostname to use when dispatching values for this database. Defaults to using
5641 the global hostname of the I<collectd> instance.
5643 =item B<Username> I<Username>
5645 Username used for authentication.
5647 =item B<Password> I<Password>
5649 Password used for authentication.
5651 =item B<Query> I<QueryName>
5653 Associates the query named I<QueryName> with this database connection. The
5654 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
5655 blocks you want to refer to must be placed above the database block you want to
5660 =head2 Plugin C<ovs_events>
5662 The I<ovs_events> plugin monitors the link status of I<Open vSwitch> (OVS)
5663 connected interfaces, dispatches the values to collectd and sends the
5664 notification whenever the link state change occurs. This plugin uses OVS
5665 database to get a link state change notification.
5669 <Plugin "ovs_events">
5672 Socket "/var/run/openvswitch/db.sock"
5673 Interfaces "br0" "veth0"
5674 SendNotification true
5675 DispatchValues false
5678 The plugin provides the following configuration options:
5682 =item B<Address> I<node>
5684 The address of the OVS DB server JSON-RPC interface used by the plugin. To
5685 enable the interface, OVS DB daemon should be running with C<--remote=ptcp:>
5686 option. See L<ovsdb-server(1)> for more details. The option may be either
5687 network hostname, IPv4 numbers-and-dots notation or IPv6 hexadecimal string
5688 format. Defaults to B<'localhost'>.
5690 =item B<Port> I<service>
5692 TCP-port to connect to. Either a service name or a port number may be given.
5693 Defaults to B<6640>.
5695 =item B<Socket> I<path>
5697 The UNIX domain socket path of OVS DB server JSON-RPC interface used by the
5698 plugin. To enable the interface, the OVS DB daemon should be running with
5699 C<--remote=punix:> option. See L<ovsdb-server(1)> for more details. If this
5700 option is set, B<Address> and B<Port> options are ignored.
5702 =item B<Interfaces> [I<ifname> ...]
5704 List of interface names to be monitored by this plugin. If this option is not
5705 specified or is empty then all OVS connected interfaces on all bridges are
5708 Default: empty (all interfaces on all bridges are monitored)
5710 =item B<SendNotification> I<true|false>
5712 If set to true, OVS link notifications (interface status and OVS DB connection
5713 terminate) are sent to collectd. Default value is true.
5715 =item B<DispatchValues> I<true|false>
5717 Dispatch the OVS DB interface link status value with configured plugin interval.
5718 Defaults to false. Please note, if B<SendNotification> and B<DispatchValues>
5719 options are false, no OVS information will be provided by the plugin.
5723 B<Note:> By default, the global interval setting is used within which to
5724 retrieve the OVS link status. To configure a plugin-specific interval, please
5725 use B<Interval> option of the OVS B<LoadPlugin> block settings. For milliseconds
5726 simple divide the time by 1000 for example if the desired interval is 50ms, set
5729 =head2 Plugin C<ovs_stats>
5731 The I<ovs_stats> plugin collects statistics of OVS connected interfaces.
5732 This plugin uses OVSDB management protocol (RFC7047) monitor mechanism to get
5733 statistics from OVSDB
5737 <Plugin "ovs_stats">
5740 Socket "/var/run/openvswitch/db.sock"
5741 Bridges "br0" "br_ext"
5744 The plugin provides the following configuration options:
5748 =item B<Address> I<node>
5750 The address of the OVS DB server JSON-RPC interface used by the plugin. To
5751 enable the interface, OVS DB daemon should be running with C<--remote=ptcp:>
5752 option. See L<ovsdb-server(1)> for more details. The option may be either
5753 network hostname, IPv4 numbers-and-dots notation or IPv6 hexadecimal string
5754 format. Defaults to B<'localhost'>.
5756 =item B<Port> I<service>
5758 TCP-port to connect to. Either a service name or a port number may be given.
5759 Defaults to B<6640>.
5761 =item B<Socket> I<path>
5763 The UNIX domain socket path of OVS DB server JSON-RPC interface used by the
5764 plugin. To enable the interface, the OVS DB daemon should be running with
5765 C<--remote=punix:> option. See L<ovsdb-server(1)> for more details. If this
5766 option is set, B<Address> and B<Port> options are ignored.
5768 =item B<Bridges> [I<brname> ...]
5770 List of OVS bridge names to be monitored by this plugin. If this option is
5771 omitted or is empty then all OVS bridges will be monitored.
5773 Default: empty (monitor all bridges)
5777 =head2 Plugin C<perl>
5779 This plugin embeds a Perl-interpreter into collectd and provides an interface
5780 to collectd's plugin system. See L<collectd-perl(5)> for its documentation.
5782 =head2 Plugin C<pinba>
5784 The I<Pinba plugin> receives profiling information from I<Pinba>, an extension
5785 for the I<PHP> interpreter. At the end of executing a script, i.e. after a
5786 PHP-based webpage has been delivered, the extension will send a UDP packet
5787 containing timing information, peak memory usage and so on. The plugin will
5788 wait for such packets, parse them and account the provided information, which
5789 is then dispatched to the daemon once per interval.
5796 # Overall statistics for the website.
5798 Server "www.example.com"
5800 # Statistics for www-a only
5802 Host "www-a.example.com"
5803 Server "www.example.com"
5805 # Statistics for www-b only
5807 Host "www-b.example.com"
5808 Server "www.example.com"
5812 The plugin provides the following configuration options:
5816 =item B<Address> I<Node>
5818 Configures the address used to open a listening socket. By default, plugin will
5819 bind to the I<any> address C<::0>.
5821 =item B<Port> I<Service>
5823 Configures the port (service) to bind to. By default the default Pinba port
5824 "30002" will be used. The option accepts service names in addition to port
5825 numbers and thus requires a I<string> argument.
5827 =item E<lt>B<View> I<Name>E<gt> block
5829 The packets sent by the Pinba extension include the hostname of the server, the
5830 server name (the name of the virtual host) and the script that was executed.
5831 Using B<View> blocks it is possible to separate the data into multiple groups
5832 to get more meaningful statistics. Each packet is added to all matching groups,
5833 so that a packet may be accounted for more than once.
5837 =item B<Host> I<Host>
5839 Matches the hostname of the system the webserver / script is running on. This
5840 will contain the result of the L<gethostname(2)> system call. If not
5841 configured, all hostnames will be accepted.
5843 =item B<Server> I<Server>
5845 Matches the name of the I<virtual host>, i.e. the contents of the
5846 C<$_SERVER["SERVER_NAME"]> variable when within PHP. If not configured, all
5847 server names will be accepted.
5849 =item B<Script> I<Script>
5851 Matches the name of the I<script name>, i.e. the contents of the
5852 C<$_SERVER["SCRIPT_NAME"]> variable when within PHP. If not configured, all
5853 script names will be accepted.
5859 =head2 Plugin C<ping>
5861 The I<Ping> plugin starts a new thread which sends ICMP "ping" packets to the
5862 configured hosts periodically and measures the network latency. Whenever the
5863 C<read> function of the plugin is called, it submits the average latency, the
5864 standard deviation and the drop rate for each host.
5866 Available configuration options:
5870 =item B<Host> I<IP-address>
5872 Host to ping periodically. This option may be repeated several times to ping
5875 =item B<Interval> I<Seconds>
5877 Sets the interval in which to send ICMP echo packets to the configured hosts.
5878 This is B<not> the interval in which metrics are read from the plugin but the
5879 interval in which the hosts are "pinged". Therefore, the setting here should be
5880 smaller than or equal to the global B<Interval> setting. Fractional times, such
5881 as "1.24" are allowed.
5885 =item B<Timeout> I<Seconds>
5887 Time to wait for a response from the host to which an ICMP packet had been
5888 sent. If a reply was not received after I<Seconds> seconds, the host is assumed
5889 to be down or the packet to be dropped. This setting must be smaller than the
5890 B<Interval> setting above for the plugin to work correctly. Fractional
5891 arguments are accepted.
5895 =item B<TTL> I<0-255>
5897 Sets the Time-To-Live of generated ICMP packets.
5899 =item B<Size> I<size>
5901 Sets the size of the data payload in ICMP packet to specified I<size> (it
5902 will be filled with regular ASCII pattern). If not set, default 56 byte
5903 long string is used so that the packet size of an ICMPv4 packet is exactly
5904 64 bytes, similar to the behaviour of normal ping(1) command.
5906 =item B<SourceAddress> I<host>
5908 Sets the source address to use. I<host> may either be a numerical network
5909 address or a network hostname.
5911 =item B<Device> I<name>
5913 Sets the outgoing network device to be used. I<name> has to specify an
5914 interface name (e.E<nbsp>g. C<eth0>). This might not be supported by all
5917 =item B<MaxMissed> I<Packets>
5919 Trigger a DNS resolve after the host has not replied to I<Packets> packets. This
5920 enables the use of dynamic DNS services (like dyndns.org) with the ping plugin.
5922 Default: B<-1> (disabled)
5926 =head2 Plugin C<postgresql>
5928 The C<postgresql> plugin queries statistics from PostgreSQL databases. It
5929 keeps a persistent connection to all configured databases and tries to
5930 reconnect if the connection has been interrupted. A database is configured by
5931 specifying a B<Database> block as described below. The default statistics are
5932 collected from PostgreSQL's B<statistics collector> which thus has to be
5933 enabled for this plugin to work correctly. This should usually be the case by
5934 default. See the section "The Statistics Collector" of the B<PostgreSQL
5935 Documentation> for details.
5937 By specifying custom database queries using a B<Query> block as described
5938 below, you may collect any data that is available from some PostgreSQL
5939 database. This way, you are able to access statistics of external daemons
5940 which are available in a PostgreSQL database or use future or special
5941 statistics provided by PostgreSQL without the need to upgrade your collectd
5944 Starting with version 5.2, the C<postgresql> plugin supports writing data to
5945 PostgreSQL databases as well. This has been implemented in a generic way. You
5946 need to specify an SQL statement which will then be executed by collectd in
5947 order to write the data (see below for details). The benefit of that approach
5948 is that there is no fixed database layout. Rather, the layout may be optimized
5949 for the current setup.
5951 The B<PostgreSQL Documentation> manual can be found at
5952 L<http://www.postgresql.org/docs/manuals/>.
5956 Statement "SELECT magic FROM wizard WHERE host = $1;"
5960 InstancePrefix "magic"
5965 <Query rt36_tickets>
5966 Statement "SELECT COUNT(type) AS count, type \
5968 WHEN resolved = 'epoch' THEN 'open' \
5969 ELSE 'resolved' END AS type \
5970 FROM tickets) type \
5974 InstancePrefix "rt36_tickets"
5975 InstancesFrom "type"
5981 Statement "SELECT collectd_insert($1, $2, $3, $4, $5, $6, $7, $8, $9);"
5991 KRBSrvName "kerberos_service_name"
5997 Service "service_name"
5998 Query backend # predefined
6009 The B<Query> block defines one database query which may later be used by a
6010 database definition. It accepts a single mandatory argument which specifies
6011 the name of the query. The names of all queries have to be unique (see the
6012 B<MinVersion> and B<MaxVersion> options below for an exception to this
6015 In each B<Query> block, there is one or more B<Result> blocks. Multiple
6016 B<Result> blocks may be used to extract multiple values from a single query.
6018 The following configuration options are available to define the query:
6022 =item B<Statement> I<sql query statement>
6024 Specify the I<sql query statement> which the plugin should execute. The string
6025 may contain the tokens B<$1>, B<$2>, etc. which are used to reference the
6026 first, second, etc. parameter. The value of the parameters is specified by the
6027 B<Param> configuration option - see below for details. To include a literal
6028 B<$> character followed by a number, surround it with single quotes (B<'>).
6030 Any SQL command which may return data (such as C<SELECT> or C<SHOW>) is
6031 allowed. Note, however, that only a single command may be used. Semicolons are
6032 allowed as long as a single non-empty command has been specified only.
6034 The returned lines will be handled separately one after another.
6036 =item B<Param> I<hostname>|I<database>|I<instance>|I<username>|I<interval>
6038 Specify the parameters which should be passed to the SQL query. The parameters
6039 are referred to in the SQL query as B<$1>, B<$2>, etc. in the same order as
6040 they appear in the configuration file. The value of the parameter is
6041 determined depending on the value of the B<Param> option as follows:
6047 The configured hostname of the database connection. If a UNIX domain socket is
6048 used, the parameter expands to "localhost".
6052 The name of the database of the current connection.
6056 The name of the database plugin instance. See the B<Instance> option of the
6057 database specification below for details.
6061 The username used to connect to the database.
6065 The interval with which this database is queried (as specified by the database
6066 specific or global B<Interval> options).
6070 Please note that parameters are only supported by PostgreSQL's protocol
6071 version 3 and above which was introduced in version 7.4 of PostgreSQL.
6073 =item B<PluginInstanceFrom> I<column>
6075 Specify how to create the "PluginInstance" for reporting this query results.
6076 Only one column is supported. You may concatenate fields and string values in
6077 the query statement to get the required results.
6079 =item B<MinVersion> I<version>
6081 =item B<MaxVersion> I<version>
6083 Specify the minimum or maximum version of PostgreSQL that this query should be
6084 used with. Some statistics might only be available with certain versions of
6085 PostgreSQL. This allows you to specify multiple queries with the same name but
6086 which apply to different versions, thus allowing you to use the same
6087 configuration in a heterogeneous environment.
6089 The I<version> has to be specified as the concatenation of the major, minor
6090 and patch-level versions, each represented as two-decimal-digit numbers. For
6091 example, version 8.2.3 will become 80203.
6095 The B<Result> block defines how to handle the values returned from the query.
6096 It defines which column holds which value and how to dispatch that value to
6101 =item B<Type> I<type>
6103 The I<type> name to be used when dispatching the values. The type describes
6104 how to handle the data and where to store it. See L<types.db(5)> for more
6105 details on types and their configuration. The number and type of values (as
6106 selected by the B<ValuesFrom> option) has to match the type of the given name.
6108 This option is mandatory.
6110 =item B<InstancePrefix> I<prefix>
6112 =item B<InstancesFrom> I<column0> [I<column1> ...]
6114 Specify how to create the "TypeInstance" for each data set (i.E<nbsp>e. line).
6115 B<InstancePrefix> defines a static prefix that will be prepended to all type
6116 instances. B<InstancesFrom> defines the column names whose values will be used
6117 to create the type instance. Multiple values will be joined together using the
6118 hyphen (C<->) as separation character.
6120 The plugin itself does not check whether or not all built instances are
6121 different. It is your responsibility to assure that each is unique.
6123 Both options are optional. If none is specified, the type instance will be
6126 =item B<ValuesFrom> I<column0> [I<column1> ...]
6128 Names the columns whose content is used as the actual data for the data sets
6129 that are dispatched to the daemon. How many such columns you need is
6130 determined by the B<Type> setting as explained above. If you specify too many
6131 or not enough columns, the plugin will complain about that and no data will be
6132 submitted to the daemon.
6134 The actual data type, as seen by PostgreSQL, is not that important as long as
6135 it represents numbers. The plugin will automatically cast the values to the
6136 right type if it know how to do that. For that, it uses the L<strtoll(3)> and
6137 L<strtod(3)> functions, so anything supported by those functions is supported
6138 by the plugin as well.
6140 This option is required inside a B<Result> block and may be specified multiple
6141 times. If multiple B<ValuesFrom> options are specified, the columns are read
6146 The following predefined queries are available (the definitions can be found
6147 in the F<postgresql_default.conf> file which, by default, is available at
6148 C<I<prefix>/share/collectd/>):
6154 This query collects the number of backends, i.E<nbsp>e. the number of
6157 =item B<transactions>
6159 This query collects the numbers of committed and rolled-back transactions of
6164 This query collects the numbers of various table modifications (i.E<nbsp>e.
6165 insertions, updates, deletions) of the user tables.
6167 =item B<query_plans>
6169 This query collects the numbers of various table scans and returned tuples of
6172 =item B<table_states>
6174 This query collects the numbers of live and dead rows in the user tables.
6178 This query collects disk block access counts for user tables.
6182 This query collects the on-disk size of the database in bytes.
6186 In addition, the following detailed queries are available by default. Please
6187 note that each of those queries collects information B<by table>, thus,
6188 potentially producing B<a lot> of data. For details see the description of the
6189 non-by_table queries above.
6193 =item B<queries_by_table>
6195 =item B<query_plans_by_table>
6197 =item B<table_states_by_table>
6199 =item B<disk_io_by_table>
6203 The B<Writer> block defines a PostgreSQL writer backend. It accepts a single
6204 mandatory argument specifying the name of the writer. This will then be used
6205 in the B<Database> specification in order to activate the writer instance. The
6206 names of all writers have to be unique. The following options may be
6211 =item B<Statement> I<sql statement>
6213 This mandatory option specifies the SQL statement that will be executed for
6214 each submitted value. A single SQL statement is allowed only. Anything after
6215 the first semicolon will be ignored.
6217 Nine parameters will be passed to the statement and should be specified as
6218 tokens B<$1>, B<$2>, through B<$9> in the statement string. The following
6219 values are made available through those parameters:
6225 The timestamp of the queried value as an RFC 3339-formatted local time.
6229 The hostname of the queried value.
6233 The plugin name of the queried value.
6237 The plugin instance of the queried value. This value may be B<NULL> if there
6238 is no plugin instance.
6242 The type of the queried value (cf. L<types.db(5)>).
6246 The type instance of the queried value. This value may be B<NULL> if there is
6251 An array of names for the submitted values (i.E<nbsp>e., the name of the data
6252 sources of the submitted value-list).
6256 An array of types for the submitted values (i.E<nbsp>e., the type of the data
6257 sources of the submitted value-list; C<counter>, C<gauge>, ...). Note, that if
6258 B<StoreRates> is enabled (which is the default, see below), all types will be
6263 An array of the submitted values. The dimensions of the value name and value
6268 In general, it is advisable to create and call a custom function in the
6269 PostgreSQL database for this purpose. Any procedural language supported by
6270 PostgreSQL will do (see chapter "Server Programming" in the PostgreSQL manual
6273 =item B<StoreRates> B<false>|B<true>
6275 If set to B<true> (the default), convert counter values to rates. If set to
6276 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
6281 The B<Database> block defines one PostgreSQL database for which to collect
6282 statistics. It accepts a single mandatory argument which specifies the
6283 database name. None of the other options are required. PostgreSQL will use
6284 default values as documented in the section "CONNECTING TO A DATABASE" in the
6285 L<psql(1)> manpage. However, be aware that those defaults may be influenced by
6286 the user collectd is run as and special environment variables. See the manpage
6291 =item B<Interval> I<seconds>
6293 Specify the interval with which the database should be queried. The default is
6294 to use the global B<Interval> setting.
6296 =item B<CommitInterval> I<seconds>
6298 This option may be used for database connections which have "writers" assigned
6299 (see above). If specified, it causes a writer to put several updates into a
6300 single transaction. This transaction will last for the specified amount of
6301 time. By default, each update will be executed in a separate transaction. Each
6302 transaction generates a fair amount of overhead which can, thus, be reduced by
6303 activating this option. The draw-back is, that data covering the specified
6304 amount of time will be lost, for example, if a single statement within the
6305 transaction fails or if the database server crashes.
6307 =item B<Instance> I<name>
6309 Specify the plugin instance name that should be used instead of the database
6310 name (which is the default, if this option has not been specified). This
6311 allows one to query multiple databases of the same name on the same host (e.g.
6312 when running multiple database server versions in parallel).
6313 The plugin instance name can also be set from the query result using
6314 the B<PluginInstanceFrom> option in B<Query> block.
6316 =item B<Host> I<hostname>
6318 Specify the hostname or IP of the PostgreSQL server to connect to. If the
6319 value begins with a slash, it is interpreted as the directory name in which to
6320 look for the UNIX domain socket.
6322 This option is also used to determine the hostname that is associated with a
6323 collected data set. If it has been omitted or either begins with with a slash
6324 or equals B<localhost> it will be replaced with the global hostname definition
6325 of collectd. Any other value will be passed literally to collectd when
6326 dispatching values. Also see the global B<Hostname> and B<FQDNLookup> options.
6328 =item B<Port> I<port>
6330 Specify the TCP port or the local UNIX domain socket file extension of the
6333 =item B<User> I<username>
6335 Specify the username to be used when connecting to the server.
6337 =item B<Password> I<password>
6339 Specify the password to be used when connecting to the server.
6341 =item B<ExpireDelay> I<delay>
6343 Skip expired values in query output.
6345 =item B<SSLMode> I<disable>|I<allow>|I<prefer>|I<require>
6347 Specify whether to use an SSL connection when contacting the server. The
6348 following modes are supported:
6354 Do not use SSL at all.
6358 First, try to connect without using SSL. If that fails, try using SSL.
6360 =item I<prefer> (default)
6362 First, try to connect using SSL. If that fails, try without using SSL.
6370 =item B<Instance> I<name>
6372 Specify the plugin instance name that should be used instead of the database
6373 name (which is the default, if this option has not been specified). This
6374 allows one to query multiple databases of the same name on the same host (e.g.
6375 when running multiple database server versions in parallel).
6377 =item B<KRBSrvName> I<kerberos_service_name>
6379 Specify the Kerberos service name to use when authenticating with Kerberos 5
6380 or GSSAPI. See the sections "Kerberos authentication" and "GSSAPI" of the
6381 B<PostgreSQL Documentation> for details.
6383 =item B<Service> I<service_name>
6385 Specify the PostgreSQL service name to use for additional parameters. That
6386 service has to be defined in F<pg_service.conf> and holds additional
6387 connection parameters. See the section "The Connection Service File" in the
6388 B<PostgreSQL Documentation> for details.
6390 =item B<Query> I<query>
6392 Specifies a I<query> which should be executed in the context of the database
6393 connection. This may be any of the predefined or user-defined queries. If no
6394 such option is given, it defaults to "backends", "transactions", "queries",
6395 "query_plans", "table_states", "disk_io" and "disk_usage" (unless a B<Writer>
6396 has been specified). Else, the specified queries are used only.
6398 =item B<Writer> I<writer>
6400 Assigns the specified I<writer> backend to the database connection. This
6401 causes all collected data to be send to the database using the settings
6402 defined in the writer configuration (see the section "FILTER CONFIGURATION"
6403 below for details on how to selectively send data to certain plugins).
6405 Each writer will register a flush callback which may be used when having long
6406 transactions enabled (see the B<CommitInterval> option above). When issuing
6407 the B<FLUSH> command (see L<collectd-unixsock(5)> for details) the current
6408 transaction will be committed right away. Two different kinds of flush
6409 callbacks are available with the C<postgresql> plugin:
6415 Flush all writer backends.
6417 =item B<postgresql->I<database>
6419 Flush all writers of the specified I<database> only.
6425 =head2 Plugin C<powerdns>
6427 The C<powerdns> plugin queries statistics from an authoritative PowerDNS
6428 nameserver and/or a PowerDNS recursor. Since both offer a wide variety of
6429 values, many of which are probably meaningless to most users, but may be useful
6430 for some. So you may chose which values to collect, but if you don't, some
6431 reasonable defaults will be collected.
6434 <Server "server_name">
6436 Collect "udp-answers" "udp-queries"
6437 Socket "/var/run/pdns.controlsocket"
6439 <Recursor "recursor_name">
6441 Collect "cache-hits" "cache-misses"
6442 Socket "/var/run/pdns_recursor.controlsocket"
6444 LocalSocket "/opt/collectd/var/run/collectd-powerdns"
6449 =item B<Server> and B<Recursor> block
6451 The B<Server> block defines one authoritative server to query, the B<Recursor>
6452 does the same for an recursing server. The possible options in both blocks are
6453 the same, though. The argument defines a name for the serverE<nbsp>/ recursor
6458 =item B<Collect> I<Field>
6460 Using the B<Collect> statement you can select which values to collect. Here,
6461 you specify the name of the values as used by the PowerDNS servers, e.E<nbsp>g.
6462 C<dlg-only-drops>, C<answers10-100>.
6464 The method of getting the values differs for B<Server> and B<Recursor> blocks:
6465 When querying the server a C<SHOW *> command is issued in any case, because
6466 that's the only way of getting multiple values out of the server at once.
6467 collectd then picks out the values you have selected. When querying the
6468 recursor, a command is generated to query exactly these values. So if you
6469 specify invalid fields when querying the recursor, a syntax error may be
6470 returned by the daemon and collectd may not collect any values at all.
6472 If no B<Collect> statement is given, the following B<Server> values will be
6479 =item packetcache-hit
6481 =item packetcache-miss
6483 =item packetcache-size
6485 =item query-cache-hit
6487 =item query-cache-miss
6489 =item recursing-answers
6491 =item recursing-questions
6503 The following B<Recursor> values will be collected by default:
6507 =item noerror-answers
6509 =item nxdomain-answers
6511 =item servfail-answers
6529 Please note that up to that point collectd doesn't know what values are
6530 available on the server and values that are added do not need a change of the
6531 mechanism so far. However, the values must be mapped to collectd's naming
6532 scheme, which is done using a lookup table that lists all known values. If
6533 values are added in the future and collectd does not know about them, you will
6534 get an error much like this:
6536 powerdns plugin: submit: Not found in lookup table: foobar = 42
6538 In this case please file a bug report with the collectd team.
6540 =item B<Socket> I<Path>
6542 Configures the path to the UNIX domain socket to be used when connecting to the
6543 daemon. By default C<${localstatedir}/run/pdns.controlsocket> will be used for
6544 an authoritative server and C<${localstatedir}/run/pdns_recursor.controlsocket>
6545 will be used for the recursor.
6549 =item B<LocalSocket> I<Path>
6551 Querying the recursor is done using UDP. When using UDP over UNIX domain
6552 sockets, the client socket needs a name in the file system, too. You can set
6553 this local name to I<Path> using the B<LocalSocket> option. The default is
6554 C<I<prefix>/var/run/collectd-powerdns>.
6558 =head2 Plugin C<processes>
6562 =item B<Process> I<Name>
6564 Select more detailed statistics of processes matching this name. The statistics
6565 collected for these selected processes are:
6566 - size of the resident segment size (RSS)
6567 - user- and system-time used
6568 - number of processes
6570 - number of open files (under Linux)
6571 - io data (where available)
6572 - context switches (under Linux)
6573 - minor and major pagefaults.
6575 Some platforms have a limit on the length of process names. I<Name> must stay
6578 =item B<ProcessMatch> I<name> I<regex>
6580 Similar to the B<Process> option this allows one to select more detailed
6581 statistics of processes matching the specified I<regex> (see L<regex(7)> for
6582 details). The statistics of all matching processes are summed up and
6583 dispatched to the daemon using the specified I<name> as an identifier. This
6584 allows one to "group" several processes together. I<name> must not contain
6587 =item B<CollectContextSwitch> I<Boolean>
6589 Collect context switch of the process.
6593 =head2 Plugin C<protocols>
6595 Collects a lot of information about various network protocols, such as I<IP>,
6596 I<TCP>, I<UDP>, etc.
6598 Available configuration options:
6602 =item B<Value> I<Selector>
6604 Selects whether or not to select a specific value. The string being matched is
6605 of the form "I<Protocol>:I<ValueName>", where I<Protocol> will be used as the
6606 plugin instance and I<ValueName> will be used as type instance. An example of
6607 the string being used would be C<Tcp:RetransSegs>.
6609 You can use regular expressions to match a large number of values with just one
6610 configuration option. To select all "extended" I<TCP> values, you could use the
6611 following statement:
6615 Whether only matched values are selected or all matched values are ignored
6616 depends on the B<IgnoreSelected>. By default, only matched values are selected.
6617 If no value is configured at all, all values will be selected.
6619 See F</"IGNORELISTS"> for details.
6621 =item B<IgnoreSelected> B<true>|B<false>
6623 If set to B<true>, inverts the selection made by B<Value>, i.E<nbsp>e. all
6624 matching values will be ignored.
6628 =head2 Plugin C<python>
6630 This plugin embeds a Python-interpreter into collectd and provides an interface
6631 to collectd's plugin system. See L<collectd-python(5)> for its documentation.
6633 =head2 Plugin C<routeros>
6635 The C<routeros> plugin connects to a device running I<RouterOS>, the
6636 Linux-based operating system for routers by I<MikroTik>. The plugin uses
6637 I<librouteros> to connect and reads information about the interfaces and
6638 wireless connections of the device. The configuration supports querying
6643 Host "router0.example.com"
6646 CollectInterface true
6651 Host "router1.example.com"
6654 CollectInterface true
6655 CollectRegistrationTable true
6661 As you can see above, the configuration of the I<routeros> plugin consists of
6662 one or more B<E<lt>RouterE<gt>> blocks. Within each block, the following
6663 options are understood:
6667 =item B<Host> I<Host>
6669 Hostname or IP-address of the router to connect to.
6671 =item B<Port> I<Port>
6673 Port name or port number used when connecting. If left unspecified, the default
6674 will be chosen by I<librouteros>, currently "8728". This option expects a
6675 string argument, even when a numeric port number is given.
6677 =item B<User> I<User>
6679 Use the user name I<User> to authenticate. Defaults to "admin".
6681 =item B<Password> I<Password>
6683 Set the password used to authenticate.
6685 =item B<CollectInterface> B<true>|B<false>
6687 When set to B<true>, interface statistics will be collected for all interfaces
6688 present on the device. Defaults to B<false>.
6690 =item B<CollectRegistrationTable> B<true>|B<false>
6692 When set to B<true>, information about wireless LAN connections will be
6693 collected. Defaults to B<false>.
6695 =item B<CollectCPULoad> B<true>|B<false>
6697 When set to B<true>, information about the CPU usage will be collected. The
6698 number is a dimensionless value where zero indicates no CPU usage at all.
6699 Defaults to B<false>.
6701 =item B<CollectMemory> B<true>|B<false>
6703 When enabled, the amount of used and free memory will be collected. How used
6704 memory is calculated is unknown, for example whether or not caches are counted
6706 Defaults to B<false>.
6708 =item B<CollectDF> B<true>|B<false>
6710 When enabled, the amount of used and free disk space will be collected.
6711 Defaults to B<false>.
6713 =item B<CollectDisk> B<true>|B<false>
6715 When enabled, the number of sectors written and bad blocks will be collected.
6716 Defaults to B<false>.
6720 =head2 Plugin C<redis>
6722 The I<Redis plugin> connects to one or more Redis servers and gathers
6723 information about each server's state. For each server there is a I<Node> block
6724 which configures the connection parameters for this node.
6731 <Query "LLEN myqueue">
6738 The information shown in the synopsis above is the I<default configuration>
6739 which is used by the plugin if no configuration is present.
6743 =item B<Node> I<Nodename>
6745 The B<Node> block identifies a new Redis node, that is a new Redis instance
6746 running in an specified host and port. The name for node is a canonical
6747 identifier which is used as I<plugin instance>. It is limited to
6748 64E<nbsp>characters in length.
6750 =item B<Host> I<Hostname>
6752 The B<Host> option is the hostname or IP-address where the Redis instance is
6755 =item B<Port> I<Port>
6757 The B<Port> option is the TCP port on which the Redis instance accepts
6758 connections. Either a service name of a port number may be given. Please note
6759 that numerical port numbers must be given as a string, too.
6761 =item B<Password> I<Password>
6763 Use I<Password> to authenticate when connecting to I<Redis>.
6765 =item B<Timeout> I<Milliseconds>
6767 The B<Timeout> option set the socket timeout for node response. Since the Redis
6768 read function is blocking, you should keep this value as low as possible. Keep
6769 in mind that the sum of all B<Timeout> values for all B<Nodes> should be lower
6770 than B<Interval> defined globally.
6772 =item B<Query> I<Querystring>
6774 The B<Query> block identifies a query to execute against the redis server.
6775 There may be an arbitrary number of queries to execute.
6777 =item B<Type> I<Collectd type>
6779 Within a query definition, a valid collectd type to use as when submitting
6780 the result of the query. When not supplied, will default to B<gauge>.
6782 =item B<Instance> I<Type instance>
6784 Within a query definition, an optional type instance to use when submitting
6785 the result of the query. When not supplied will default to the escaped
6786 command, up to 64 chars.
6790 =head2 Plugin C<rrdcached>
6792 The C<rrdcached> plugin uses the RRDtool accelerator daemon, L<rrdcached(1)>,
6793 to store values to RRD files in an efficient manner. The combination of the
6794 C<rrdcached> B<plugin> and the C<rrdcached> B<daemon> is very similar to the
6795 way the C<rrdtool> plugin works (see below). The added abstraction layer
6796 provides a number of benefits, though: Because the cache is not within
6797 C<collectd> anymore, it does not need to be flushed when C<collectd> is to be
6798 restarted. This results in much shorter (if any) gaps in graphs, especially
6799 under heavy load. Also, the C<rrdtool> command line utility is aware of the
6800 daemon so that it can flush values to disk automatically when needed. This
6801 allows one to integrate automated flushing of values into graphing solutions
6804 There are disadvantages, though: The daemon may reside on a different host, so
6805 it may not be possible for C<collectd> to create the appropriate RRD files
6806 anymore. And even if C<rrdcached> runs on the same host, it may run in a
6807 different base directory, so relative paths may do weird stuff if you're not
6810 So the B<recommended configuration> is to let C<collectd> and C<rrdcached> run
6811 on the same host, communicating via a UNIX domain socket. The B<DataDir>
6812 setting should be set to an absolute path, so that a changed base directory
6813 does not result in RRD files being createdE<nbsp>/ expected in the wrong place.
6817 =item B<DaemonAddress> I<Address>
6819 Address of the daemon as understood by the C<rrdc_connect> function of the RRD
6820 library. See L<rrdcached(1)> for details. Example:
6822 <Plugin "rrdcached">
6823 DaemonAddress "unix:/var/run/rrdcached.sock"
6826 =item B<DataDir> I<Directory>
6828 Set the base directory in which the RRD files reside. If this is a relative
6829 path, it is relative to the working base directory of the C<rrdcached> daemon!
6830 Use of an absolute path is recommended.
6832 =item B<CreateFiles> B<true>|B<false>
6834 Enables or disables the creation of RRD files. If the daemon is not running
6835 locally, or B<DataDir> is set to a relative path, this will not work as
6836 expected. Default is B<true>.
6838 =item B<CreateFilesAsync> B<false>|B<true>
6840 When enabled, new RRD files are enabled asynchronously, using a separate thread
6841 that runs in the background. This prevents writes to block, which is a problem
6842 especially when many hundreds of files need to be created at once. However,
6843 since the purpose of creating the files asynchronously is I<not> to block until
6844 the file is available, values before the file is available will be discarded.
6845 When disabled (the default) files are created synchronously, blocking for a
6846 short while, while the file is being written.
6848 =item B<StepSize> I<Seconds>
6850 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
6851 this setting is unset and the stepsize is set to the interval in which the data
6852 is collected. Do not use this option unless you absolutely have to for some
6853 reason. Setting this option may cause problems with the C<snmp plugin>, the
6854 C<exec plugin> or when the daemon is set up to receive data from other hosts.
6856 =item B<HeartBeat> I<Seconds>
6858 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
6859 in which case the heartbeat is set to twice the B<StepSize> which should equal
6860 the interval in which data is collected. Do not set this option unless you have
6861 a very good reason to do so.
6863 =item B<RRARows> I<NumRows>
6865 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
6866 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
6867 three times five RRAs, i. e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
6868 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
6869 week, one month, and one year.
6871 So for each timespan, it calculates how many PDPs need to be consolidated into
6872 one CDP by calculating:
6873 number of PDPs = timespan / (stepsize * rrarows)
6875 Bottom line is, set this no smaller than the width of you graphs in pixels. The
6878 =item B<RRATimespan> I<Seconds>
6880 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
6881 more then one RRA. If this option is never used, the built-in default of (3600,
6882 86400, 604800, 2678400, 31622400) is used.
6884 For more information on how RRA-sizes are calculated see B<RRARows> above.
6886 =item B<XFF> I<Factor>
6888 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
6889 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
6892 =item B<CollectStatistics> B<false>|B<true>
6894 When set to B<true>, various statistics about the I<rrdcached> daemon will be
6895 collected, with "rrdcached" as the I<plugin name>. Defaults to B<false>.
6897 Statistics are read via I<rrdcached>s socket using the STATS command.
6898 See L<rrdcached(1)> for details.
6902 =head2 Plugin C<rrdtool>
6904 You can use the settings B<StepSize>, B<HeartBeat>, B<RRARows>, and B<XFF> to
6905 fine-tune your RRD-files. Please read L<rrdcreate(1)> if you encounter problems
6906 using these settings. If you don't want to dive into the depths of RRDtool, you
6907 can safely ignore these settings.
6911 =item B<DataDir> I<Directory>
6913 Set the directory to store RRD files under. By default RRD files are generated
6914 beneath the daemon's working directory, i.e. the B<BaseDir>.
6916 =item B<CreateFilesAsync> B<false>|B<true>
6918 When enabled, new RRD files are enabled asynchronously, using a separate thread
6919 that runs in the background. This prevents writes to block, which is a problem
6920 especially when many hundreds of files need to be created at once. However,
6921 since the purpose of creating the files asynchronously is I<not> to block until
6922 the file is available, values before the file is available will be discarded.
6923 When disabled (the default) files are created synchronously, blocking for a
6924 short while, while the file is being written.
6926 =item B<StepSize> I<Seconds>
6928 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
6929 this setting is unset and the stepsize is set to the interval in which the data
6930 is collected. Do not use this option unless you absolutely have to for some
6931 reason. Setting this option may cause problems with the C<snmp plugin>, the
6932 C<exec plugin> or when the daemon is set up to receive data from other hosts.
6934 =item B<HeartBeat> I<Seconds>
6936 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
6937 in which case the heartbeat is set to twice the B<StepSize> which should equal
6938 the interval in which data is collected. Do not set this option unless you have
6939 a very good reason to do so.
6941 =item B<RRARows> I<NumRows>
6943 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
6944 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
6945 three times five RRAs, i.e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
6946 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
6947 week, one month, and one year.
6949 So for each timespan, it calculates how many PDPs need to be consolidated into
6950 one CDP by calculating:
6951 number of PDPs = timespan / (stepsize * rrarows)
6953 Bottom line is, set this no smaller than the width of you graphs in pixels. The
6956 =item B<RRATimespan> I<Seconds>
6958 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
6959 more then one RRA. If this option is never used, the built-in default of (3600,
6960 86400, 604800, 2678400, 31622400) is used.
6962 For more information on how RRA-sizes are calculated see B<RRARows> above.
6964 =item B<XFF> I<Factor>
6966 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
6967 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
6970 =item B<CacheFlush> I<Seconds>
6972 When the C<rrdtool> plugin uses a cache (by setting B<CacheTimeout>, see below)
6973 it writes all values for a certain RRD-file if the oldest value is older than
6974 (or equal to) the number of seconds specified. If some RRD-file is not updated
6975 anymore for some reason (the computer was shut down, the network is broken,
6976 etc.) some values may still be in the cache. If B<CacheFlush> is set, then the
6977 entire cache is searched for entries older than B<CacheTimeout> seconds and
6978 written to disk every I<Seconds> seconds. Since this is kind of expensive and
6979 does nothing under normal circumstances, this value should not be too small.
6980 900 seconds might be a good value, though setting this to 7200 seconds doesn't
6981 normally do much harm either.
6983 =item B<CacheTimeout> I<Seconds>
6985 If this option is set to a value greater than zero, the C<rrdtool plugin> will
6986 save values in a cache, as described above. Writing multiple values at once
6987 reduces IO-operations and thus lessens the load produced by updating the files.
6988 The trade off is that the graphs kind of "drag behind" and that more memory is
6991 =item B<WritesPerSecond> I<Updates>
6993 When collecting many statistics with collectd and the C<rrdtool> plugin, you
6994 will run serious performance problems. The B<CacheFlush> setting and the
6995 internal update queue assert that collectd continues to work just fine even
6996 under heavy load, but the system may become very unresponsive and slow. This is
6997 a problem especially if you create graphs from the RRD files on the same
6998 machine, for example using the C<graph.cgi> script included in the
6999 C<contrib/collection3/> directory.
7001 This setting is designed for very large setups. Setting this option to a value
7002 between 25 and 80 updates per second, depending on your hardware, will leave
7003 the server responsive enough to draw graphs even while all the cached values
7004 are written to disk. Flushed values, i.E<nbsp>e. values that are forced to disk
7005 by the B<FLUSH> command, are B<not> effected by this limit. They are still
7006 written as fast as possible, so that web frontends have up to date data when
7009 For example: If you have 100,000 RRD files and set B<WritesPerSecond> to 30
7010 updates per second, writing all values to disk will take approximately
7011 56E<nbsp>minutes. Together with the flushing ability that's integrated into
7012 "collection3" you'll end up with a responsive and fast system, up to date
7013 graphs and basically a "backup" of your values every hour.
7015 =item B<RandomTimeout> I<Seconds>
7017 When set, the actual timeout for each value is chosen randomly between
7018 I<CacheTimeout>-I<RandomTimeout> and I<CacheTimeout>+I<RandomTimeout>. The
7019 intention is to avoid high load situations that appear when many values timeout
7020 at the same time. This is especially a problem shortly after the daemon starts,
7021 because all values were added to the internal cache at roughly the same time.
7025 =head2 Plugin C<sensors>
7027 The I<Sensors plugin> uses B<lm_sensors> to retrieve sensor-values. This means
7028 that all the needed modules have to be loaded and lm_sensors has to be
7029 configured (most likely by editing F</etc/sensors.conf>. Read
7030 L<sensors.conf(5)> for details.
7032 The B<lm_sensors> homepage can be found at
7033 L<http://secure.netroedge.com/~lm78/>.
7037 =item B<SensorConfigFile> I<File>
7039 Read the I<lm_sensors> configuration from I<File>. When unset (recommended),
7040 the library's default will be used.
7042 =item B<Sensor> I<chip-bus-address/type-feature>
7044 Selects the name of the sensor which you want to collect or ignore, depending
7045 on the B<IgnoreSelected> below. For example, the option "B<Sensor>
7046 I<it8712-isa-0290/voltage-in1>" will cause collectd to gather data for the
7047 voltage sensor I<in1> of the I<it8712> on the isa bus at the address 0290.
7049 See F</"IGNORELISTS"> for details.
7051 =item B<IgnoreSelected> I<true>|I<false>
7053 If no configuration if given, the B<sensors>-plugin will collect data from all
7054 sensors. This may not be practical, especially for uninteresting sensors.
7055 Thus, you can use the B<Sensor>-option to pick the sensors you're interested
7056 in. Sometimes, however, it's easier/preferred to collect all sensors I<except> a
7057 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
7058 I<true> the effect of B<Sensor> is inverted: All selected sensors are ignored
7059 and all other sensors are collected.
7061 =item B<UseLabels> I<true>|I<false>
7063 Configures how sensor readings are reported. When set to I<true>, sensor
7064 readings are reported using their descriptive label (e.g. "VCore"). When set to
7065 I<false> (the default) the sensor name is used ("in0").
7069 =head2 Plugin C<sigrok>
7071 The I<sigrok plugin> uses I<libsigrok> to retrieve measurements from any device
7072 supported by the L<sigrok|http://sigrok.org/> project.
7078 <Device "AC Voltage">
7083 <Device "Sound Level">
7084 Driver "cem-dt-885x"
7091 =item B<LogLevel> B<0-5>
7093 The I<sigrok> logging level to pass on to the I<collectd> log, as a number
7094 between B<0> and B<5> (inclusive). These levels correspond to C<None>,
7095 C<Errors>, C<Warnings>, C<Informational>, C<Debug >and C<Spew>, respectively.
7096 The default is B<2> (C<Warnings>). The I<sigrok> log messages, regardless of
7097 their level, are always submitted to I<collectd> at its INFO log level.
7099 =item E<lt>B<Device> I<Name>E<gt>
7101 A sigrok-supported device, uniquely identified by this section's options. The
7102 I<Name> is passed to I<collectd> as the I<plugin instance>.
7104 =item B<Driver> I<DriverName>
7106 The sigrok driver to use for this device.
7108 =item B<Conn> I<ConnectionSpec>
7110 If the device cannot be auto-discovered, or more than one might be discovered
7111 by the driver, I<ConnectionSpec> specifies the connection string to the device.
7112 It can be of the form of a device path (e.g.E<nbsp>C</dev/ttyUSB2>), or, in
7113 case of a non-serial USB-connected device, the USB I<VendorID>B<.>I<ProductID>
7114 separated by a period (e.g.E<nbsp>C<0403.6001>). A USB device can also be
7115 specified as I<Bus>B<.>I<Address> (e.g.E<nbsp>C<1.41>).
7117 =item B<SerialComm> I<SerialSpec>
7119 For serial devices with non-standard port settings, this option can be used
7120 to specify them in a form understood by I<sigrok>, e.g.E<nbsp>C<9600/8n1>.
7121 This should not be necessary; drivers know how to communicate with devices they
7124 =item B<MinimumInterval> I<Seconds>
7126 Specifies the minimum time between measurement dispatches to I<collectd>, in
7127 seconds. Since some I<sigrok> supported devices can acquire measurements many
7128 times per second, it may be necessary to throttle these. For example, the
7129 I<RRD plugin> cannot process writes more than once per second.
7131 The default B<MinimumInterval> is B<0>, meaning measurements received from the
7132 device are always dispatched to I<collectd>. When throttled, unused
7133 measurements are discarded.
7137 =head2 Plugin C<smart>
7139 The C<smart> plugin collects SMART information from physical
7140 disks. Values collectd include temperature, power cycle count, poweron
7141 time and bad sectors. Also, all SMART attributes are collected along
7142 with the normalized current value, the worst value, the threshold and
7143 a human readable value.
7145 Using the following two options you can ignore some disks or configure the
7146 collection only of specific disks.
7150 =item B<Disk> I<Name>
7152 Select the disk I<Name>. Whether it is collected or ignored depends on the
7153 B<IgnoreSelected> setting, see below. As with other plugins that use the
7154 daemon's ignorelist functionality, a string that starts and ends with a slash
7155 is interpreted as a regular expression. Examples:
7160 See F</"IGNORELISTS"> for details.
7162 =item B<IgnoreSelected> B<true>|B<false>
7164 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
7165 statements, are ignored or if all other disks are ignored. The behavior
7166 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
7167 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
7168 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
7169 is set to B<true>, all disks are collected B<except> the ones matched.
7171 =item B<IgnoreSleepMode> B<true>|B<false>
7173 Normally, the C<smart> plugin will ignore disks that are reported to be asleep.
7174 This option disables the sleep mode check and allows the plugin to collect data
7175 from these disks anyway. This is useful in cases where libatasmart mistakenly
7176 reports disks as asleep because it has not been updated to incorporate support
7177 for newer idle states in the ATA spec.
7179 =item B<UseSerial> B<true>|B<false>
7181 A disk's kernel name (e.g., sda) can change from one boot to the next. If this
7182 option is enabled, the C<smart> plugin will use the disk's serial number (e.g.,
7183 HGST_HUH728080ALE600_2EJ8VH8X) instead of the kernel name as the key for
7184 storing data. This ensures that the data for a given disk will be kept together
7185 even if the kernel name changes.
7189 =head2 Plugin C<snmp>
7191 Since the configuration of the C<snmp plugin> is a little more complicated than
7192 other plugins, its documentation has been moved to an own manpage,
7193 L<collectd-snmp(5)>. Please see there for details.
7195 =head2 Plugin C<snmp_agent>
7197 The I<snmp_agent> plugin is an AgentX subagent that receives and handles queries
7198 from SNMP master agent and returns the data collected by read plugins.
7199 The I<snmp_agent> plugin handles requests only for OIDs specified in
7200 configuration file. To handle SNMP queries the plugin gets data from collectd
7201 and translates requested values from collectd's internal format to SNMP format.
7202 This plugin is a generic plugin and cannot work without configuration.
7203 For more details on AgentX subagent see
7204 <http://www.net-snmp.org/tutorial/tutorial-5/toolkit/demon/>
7209 <Data "memAvailReal">
7211 #PluginInstance "some"
7214 OIDs "1.3.6.1.4.1.2021.4.6.0"
7217 IndexOID "IF-MIB::ifIndex"
7218 SizeOID "IF-MIB::ifNumber"
7222 OIDs "IF-MIB::ifDescr"
7228 OIDs "IF-MIB::ifInOctets" "IF-MIB::ifOutOctets"
7233 There are two types of blocks that can be contained in the
7234 C<E<lt>PluginE<nbsp> snmp_agentE<gt>> block: B<Data> and B<Table>:
7236 =head3 The B<Data> block
7238 The B<Data> block defines a list OIDs that are to be handled. This block can
7239 define scalar or table OIDs. If B<Data> block is defined inside of B<Table>
7240 block it reperesents table OIDs.
7241 The following options can be set:
7245 =item B<Instance> I<true|false>
7247 When B<Instance> is set to B<true>, the value for requested OID is copied from
7248 plugin instance field of corresponding collectd value. If B<Data> block defines
7249 scalar data type B<Instance> has no effect and can be omitted.
7251 =item B<Plugin> I<String>
7253 Read plugin name whose collected data will be mapped to specified OIDs.
7255 =item B<PluginInstance> I<String>
7257 Read plugin instance whose collected data will be mapped to specified OIDs.
7258 The field is optional and by default there is no plugin instance check.
7259 Allowed only if B<Data> block defines scalar data type.
7261 =item B<Type> I<String>
7263 Collectd's type that is to be used for specified OID, e.E<nbsp>g. "if_octets"
7264 for example. The types are read from the B<TypesDB> (see L<collectd.conf(5)>).
7266 =item B<TypeInstance> I<String>
7268 Collectd's type-instance that is to be used for specified OID.
7270 =item B<OIDs> I<OID> [I<OID> ...]
7272 Configures the OIDs to be handled by I<snmp_agent> plugin. Values for these OIDs
7273 are taken from collectd data type specified by B<Plugin>, B<PluginInstance>,
7274 B<Type>, B<TypeInstance> fields of this B<Data> block. Number of the OIDs
7275 configured should correspond to number of values in specified B<Type>.
7276 For example two OIDs "IF-MIB::ifInOctets" "IF-MIB::ifOutOctets" can be mapped to
7277 "rx" and "tx" values of "if_octets" type.
7279 =item B<Scale> I<Value>
7281 The values taken from collectd are multiplied by I<Value>. The field is optional
7282 and the default is B<1.0>.
7284 =item B<Shift> I<Value>
7286 I<Value> is added to values from collectd after they have been multiplied by
7287 B<Scale> value. The field is optional and the default value is B<0.0>.
7291 =head3 The B<Table> block
7293 The B<Table> block defines a collection of B<Data> blocks that belong to one
7294 snmp table. In addition to multiple B<Data> blocks the following options can be
7299 =item B<IndexOID> I<OID>
7301 OID that is handled by the plugin and is mapped to numerical index value that is
7302 generated by the plugin for each table record.
7304 =item B<SizeOID> I<OID>
7306 OID that is handled by the plugin. Returned value is the number of records in
7307 the table. The field is optional.
7311 =head2 Plugin C<statsd>
7313 The I<statsd plugin> listens to a UDP socket, reads "events" in the statsd
7314 protocol and dispatches rates or other aggregates of these numbers
7317 The plugin implements the I<Counter>, I<Timer>, I<Gauge> and I<Set> types which
7318 are dispatched as the I<collectd> types C<derive>, C<latency>, C<gauge> and
7319 C<objects> respectively.
7321 The following configuration options are valid:
7325 =item B<Host> I<Host>
7327 Bind to the hostname / address I<Host>. By default, the plugin will bind to the
7328 "any" address, i.e. accept packets sent to any of the hosts addresses.
7330 =item B<Port> I<Port>
7332 UDP port to listen to. This can be either a service name or a port number.
7333 Defaults to C<8125>.
7335 =item B<DeleteCounters> B<false>|B<true>
7337 =item B<DeleteTimers> B<false>|B<true>
7339 =item B<DeleteGauges> B<false>|B<true>
7341 =item B<DeleteSets> B<false>|B<true>
7343 These options control what happens if metrics are not updated in an interval.
7344 If set to B<False>, the default, metrics are dispatched unchanged, i.e. the
7345 rate of counters and size of sets will be zero, timers report C<NaN> and gauges
7346 are unchanged. If set to B<True>, the such metrics are not dispatched and
7347 removed from the internal cache.
7349 =item B<CounterSum> B<false>|B<true>
7351 When enabled, creates a C<count> metric which reports the change since the last
7352 read. This option primarily exists for compatibility with the I<statsd>
7353 implementation by Etsy.
7355 =item B<TimerPercentile> I<Percent>
7357 Calculate and dispatch the configured percentile, i.e. compute the latency, so
7358 that I<Percent> of all reported timers are smaller than or equal to the
7359 computed latency. This is useful for cutting off the long tail latency, as it's
7360 often done in I<Service Level Agreements> (SLAs).
7362 Different percentiles can be calculated by setting this option several times.
7363 If none are specified, no percentiles are calculated / dispatched.
7365 =item B<TimerLower> B<false>|B<true>
7367 =item B<TimerUpper> B<false>|B<true>
7369 =item B<TimerSum> B<false>|B<true>
7371 =item B<TimerCount> B<false>|B<true>
7373 Calculate and dispatch various values out of I<Timer> metrics received during
7374 an interval. If set to B<False>, the default, these values aren't calculated /
7379 =head2 Plugin C<swap>
7381 The I<Swap plugin> collects information about used and available swap space. On
7382 I<Linux> and I<Solaris>, the following options are available:
7386 =item B<ReportByDevice> B<false>|B<true>
7388 Configures how to report physical swap devices. If set to B<false> (the
7389 default), the summary over all swap devices is reported only, i.e. the globally
7390 used and available space over all devices. If B<true> is configured, the used
7391 and available space of each device will be reported separately.
7393 This option is only available if the I<Swap plugin> can read C</proc/swaps>
7394 (under Linux) or use the L<swapctl(2)> mechanism (under I<Solaris>).
7396 =item B<ReportBytes> B<false>|B<true>
7398 When enabled, the I<swap I/O> is reported in bytes. When disabled, the default,
7399 I<swap I/O> is reported in pages. This option is available under Linux only.
7401 =item B<ValuesAbsolute> B<true>|B<false>
7403 Enables or disables reporting of absolute swap metrics, i.e. number of I<bytes>
7404 available and used. Defaults to B<true>.
7406 =item B<ValuesPercentage> B<false>|B<true>
7408 Enables or disables reporting of relative swap metrics, i.e. I<percent>
7409 available and free. Defaults to B<false>.
7411 This is useful for deploying I<collectd> in a heterogeneous environment, where
7412 swap sizes differ and you want to specify generic thresholds or similar.
7416 =head2 Plugin C<syslog>
7420 =item B<LogLevel> B<debug|info|notice|warning|err>
7422 Sets the log-level. If, for example, set to B<notice>, then all events with
7423 severity B<notice>, B<warning>, or B<err> will be submitted to the
7426 Please note that B<debug> is only available if collectd has been compiled with
7429 =item B<NotifyLevel> B<OKAY>|B<WARNING>|B<FAILURE>
7431 Controls which notifications should be sent to syslog. The default behaviour is
7432 not to send any. Less severe notifications always imply logging more severe
7433 notifications: Setting this to B<OKAY> means all notifications will be sent to
7434 syslog, setting this to B<WARNING> will send B<WARNING> and B<FAILURE>
7435 notifications but will dismiss B<OKAY> notifications. Setting this option to
7436 B<FAILURE> will only send failures to syslog.
7440 =head2 Plugin C<table>
7442 The C<table plugin> provides generic means to parse tabular data and dispatch
7443 user specified values. Values are selected based on column numbers. For
7444 example, this plugin may be used to get values from the Linux L<proc(5)>
7445 filesystem or CSV (comma separated values) files.
7448 <Table "/proc/slabinfo">
7453 InstancePrefix "active_objs"
7459 InstancePrefix "objperslab"
7466 The configuration consists of one or more B<Table> blocks, each of which
7467 configures one file to parse. Within each B<Table> block, there are one or
7468 more B<Result> blocks, which configure which data to select and how to
7471 The following options are available inside a B<Table> block:
7475 =item B<Instance> I<instance>
7477 If specified, I<instance> is used as the plugin instance. So, in the above
7478 example, the plugin name C<table-slabinfo> would be used. If omitted, the
7479 filename of the table is used instead, with all special characters replaced
7480 with an underscore (C<_>).
7482 =item B<Separator> I<string>
7484 Any character of I<string> is interpreted as a delimiter between the different
7485 columns of the table. A sequence of two or more contiguous delimiters in the
7486 table is considered to be a single delimiter, i.E<nbsp>e. there cannot be any
7487 empty columns. The plugin uses the L<strtok_r(3)> function to parse the lines
7488 of a table - see its documentation for more details. This option is mandatory.
7490 A horizontal tab, newline and carriage return may be specified by C<\\t>,
7491 C<\\n> and C<\\r> respectively. Please note that the double backslashes are
7492 required because of collectd's config parsing.
7496 The following options are available inside a B<Result> block:
7500 =item B<Type> I<type>
7502 Sets the type used to dispatch the values to the daemon. Detailed information
7503 about types and their configuration can be found in L<types.db(5)>. This
7504 option is mandatory.
7506 =item B<InstancePrefix> I<prefix>
7508 If specified, prepend I<prefix> to the type instance. If omitted, only the
7509 B<InstancesFrom> option is considered for the type instance.
7511 =item B<InstancesFrom> I<column0> [I<column1> ...]
7513 If specified, the content of the given columns (identified by the column
7514 number starting at zero) will be used to create the type instance for each
7515 row. Multiple values (and the instance prefix) will be joined together with
7516 dashes (I<->) as separation character. If omitted, only the B<InstancePrefix>
7517 option is considered for the type instance.
7519 The plugin itself does not check whether or not all built instances are
7520 different. It’s your responsibility to assure that each is unique. This is
7521 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
7522 sure that the table only contains one row.
7524 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type instance
7527 =item B<ValuesFrom> I<column0> [I<column1> ...]
7529 Specifies the columns (identified by the column numbers starting at zero)
7530 whose content is used as the actual data for the data sets that are dispatched
7531 to the daemon. How many such columns you need is determined by the B<Type>
7532 setting above. If you specify too many or not enough columns, the plugin will
7533 complain about that and no data will be submitted to the daemon. The plugin
7534 uses L<strtoll(3)> and L<strtod(3)> to parse counter and gauge values
7535 respectively, so anything supported by those functions is supported by the
7536 plugin as well. This option is mandatory.
7540 =head2 Plugin C<tail>
7542 The C<tail plugin> follows logfiles, just like L<tail(1)> does, parses
7543 each line and dispatches found values. What is matched can be configured by the
7544 user using (extended) regular expressions, as described in L<regex(7)>.
7547 <File "/var/log/exim4/mainlog">
7551 Regex "S=([1-9][0-9]*)"
7557 Regex "\\<R=local_user\\>"
7558 ExcludeRegex "\\<R=local_user\\>.*mail_spool defer"
7561 Instance "local_user"
7564 Regex "l=([0-9]*\\.[0-9]*)"
7565 <DSType "Distribution">
7575 The config consists of one or more B<File> blocks, each of which configures one
7576 logfile to parse. Within each B<File> block, there are one or more B<Match>
7577 blocks, which configure a regular expression to search for.
7579 The B<Instance> option in the B<File> block may be used to set the plugin
7580 instance. So in the above example the plugin name C<tail-foo> would be used.
7581 This plugin instance is for all B<Match> blocks that B<follow> it, until the
7582 next B<Instance> option. This way you can extract several plugin instances from
7583 one logfile, handy when parsing syslog and the like.
7585 The B<Interval> option allows you to define the length of time between reads. If
7586 this is not set, the default Interval will be used.
7588 Each B<Match> block has the following options to describe how the match should
7593 =item B<Regex> I<regex>
7595 Sets the regular expression to use for matching against a line. The first
7596 subexpression has to match something that can be turned into a number by
7597 L<strtoll(3)> or L<strtod(3)>, depending on the value of C<CounterAdd>, see
7598 below. Because B<extended> regular expressions are used, you do not need to use
7599 backslashes for subexpressions! If in doubt, please consult L<regex(7)>. Due to
7600 collectd's config parsing you need to escape backslashes, though. So if you
7601 want to match literal parentheses you need to do the following:
7603 Regex "SPAM \\(Score: (-?[0-9]+\\.[0-9]+)\\)"
7605 =item B<ExcludeRegex> I<regex>
7607 Sets an optional regular expression to use for excluding lines from the match.
7608 An example which excludes all connections from localhost from the match:
7610 ExcludeRegex "127\\.0\\.0\\.1"
7612 =item B<DSType> I<Type>
7614 Sets how the values are cumulated. I<Type> is one of:
7618 =item B<GaugeAverage>
7620 Calculate the average.
7624 Use the smallest number only.
7628 Use the greatest number only.
7632 Use the last number found.
7634 =item B<GaugePersist>
7636 Use the last number found. The number is not reset at the end of an interval.
7637 It is continously reported until another number is matched. This is intended
7638 for cases in which only state changes are reported, for example a thermometer
7639 that only reports the temperature when it changes.
7645 =item B<AbsoluteSet>
7647 The matched number is a counter. Simply I<sets> the internal counter to this
7648 value. Variants exist for C<COUNTER>, C<DERIVE>, and C<ABSOLUTE> data sources.
7656 Add the matched value to the internal counter. In case of B<DeriveAdd>, the
7657 matched number may be negative, which will effectively subtract from the
7666 Increase the internal counter by one. These B<DSType> are the only ones that do
7667 not use the matched subexpression, but simply count the number of matched
7668 lines. Thus, you may use a regular expression without submatch in this case.
7670 =item B<Distribution>
7672 Type to do calculations based on the distribution of values, primarily
7673 calculating percentiles. This is primarily geared towards latency, but can be
7674 used for other metrics as well. The range of values tracked with this setting
7675 must be in the range (0–2^34) and can be fractional. Please note that neither
7676 zero nor 2^34 are inclusive bounds, i.e. zero I<cannot> be handled by a
7679 This option must be used together with the B<Percentile> and/or B<Bucket>
7684 <DSType "Distribution">
7691 =item B<Percentile> I<Percent>
7693 Calculate and dispatch the configured percentile, i.e. compute the value, so
7694 that I<Percent> of all matched values are smaller than or equal to the computed
7697 Metrics are reported with the I<type> B<Type> (the value of the above option)
7698 and the I<type instance> C<[E<lt>InstanceE<gt>-]E<lt>PercentE<gt>>.
7700 This option may be repeated to calculate more than one percentile.
7702 =item B<Bucket> I<lower_bound> I<upper_bound>
7704 Export the number of values (a C<DERIVE>) falling within the given range. Both,
7705 I<lower_bound> and I<upper_bound> may be a fractional number, such as B<0.5>.
7706 Each B<Bucket> option specifies an interval C<(I<lower_bound>,
7707 I<upper_bound>]>, i.e. the range I<excludes> the lower bound and I<includes>
7708 the upper bound. I<lower_bound> and I<upper_bound> may be zero, meaning no
7711 To export the entire (0–inf) range without overlap, use the upper bound of the
7712 previous range as the lower bound of the following range. In other words, use
7713 the following schema:
7723 Metrics are reported with the I<type> C<bucket> and the I<type instance>
7724 C<E<lt>TypeE<gt>[-E<lt>InstanceE<gt>]-E<lt>lower_boundE<gt>_E<lt>upper_boundE<gt>>.
7726 This option may be repeated to calculate more than one rate.
7732 The B<Gauge*> and B<Distribution> types interpret the submatch as a floating
7733 point number, using L<strtod(3)>. The B<Counter*> and B<AbsoluteSet> types
7734 interpret the submatch as an unsigned integer using L<strtoull(3)>. The
7735 B<Derive*> types interpret the submatch as a signed integer using
7736 L<strtoll(3)>. B<CounterInc> and B<DeriveInc> do not use the submatch at all
7737 and it may be omitted in this case.
7739 =item B<Type> I<Type>
7741 Sets the type used to dispatch this value. Detailed information about types and
7742 their configuration can be found in L<types.db(5)>.
7744 =item B<Instance> I<TypeInstance>
7746 This optional setting sets the type instance to use.
7750 =head2 Plugin C<tail_csv>
7752 The I<tail_csv plugin> reads files in the CSV format, e.g. the statistics file
7753 written by I<Snort>.
7758 <Metric "snort-dropped">
7763 <File "/var/log/snort/snort.stats">
7764 Instance "snort-eth0"
7766 Collect "snort-dropped"
7770 The configuration consists of one or more B<Metric> blocks that define an index
7771 into the line of the CSV file and how this value is mapped to I<collectd's>
7772 internal representation. These are followed by one or more B<Instance> blocks
7773 which configure which file to read, in which interval and which metrics to
7778 =item E<lt>B<Metric> I<Name>E<gt>
7780 The B<Metric> block configures a new metric to be extracted from the statistics
7781 file and how it is mapped on I<collectd's> data model. The string I<Name> is
7782 only used inside the B<Instance> blocks to refer to this block, so you can use
7783 one B<Metric> block for multiple CSV files.
7787 =item B<Type> I<Type>
7789 Configures which I<Type> to use when dispatching this metric. Types are defined
7790 in the L<types.db(5)> file, see the appropriate manual page for more
7791 information on specifying types. Only types with a single I<data source> are
7792 supported by the I<tail_csv plugin>. The information whether the value is an
7793 absolute value (i.e. a C<GAUGE>) or a rate (i.e. a C<DERIVE>) is taken from the
7794 I<Type's> definition.
7796 =item B<Instance> I<TypeInstance>
7798 If set, I<TypeInstance> is used to populate the type instance field of the
7799 created value lists. Otherwise, no type instance is used.
7801 =item B<ValueFrom> I<Index>
7803 Configure to read the value from the field with the zero-based index I<Index>.
7804 If the value is parsed as signed integer, unsigned integer or double depends on
7805 the B<Type> setting, see above.
7809 =item E<lt>B<File> I<Path>E<gt>
7811 Each B<File> block represents one CSV file to read. There must be at least one
7812 I<File> block but there can be multiple if you have multiple CSV files.
7816 =item B<Instance> I<PluginInstance>
7818 Sets the I<plugin instance> used when dispatching the values.
7820 =item B<Collect> I<Metric>
7822 Specifies which I<Metric> to collect. This option must be specified at least
7823 once, and you can use this option multiple times to specify more than one
7824 metric to be extracted from this statistic file.
7826 =item B<Interval> I<Seconds>
7828 Configures the interval in which to read values from this instance / file.
7829 Defaults to the plugin's default interval.
7831 =item B<TimeFrom> I<Index>
7833 Rather than using the local time when dispatching a value, read the timestamp
7834 from the field with the zero-based index I<Index>. The value is interpreted as
7835 seconds since epoch. The value is parsed as a double and may be factional.
7841 =head2 Plugin C<teamspeak2>
7843 The C<teamspeak2 plugin> connects to the query port of a teamspeak2 server and
7844 polls interesting global and virtual server data. The plugin can query only one
7845 physical server but unlimited virtual servers. You can use the following
7846 options to configure it:
7850 =item B<Host> I<hostname/ip>
7852 The hostname or ip which identifies the physical server.
7855 =item B<Port> I<port>
7857 The query port of the physical server. This needs to be a string.
7860 =item B<Server> I<port>
7862 This option has to be added once for every virtual server the plugin should
7863 query. If you want to query the virtual server on port 8767 this is what the
7864 option would look like:
7868 This option, although numeric, needs to be a string, i.E<nbsp>e. you B<must>
7869 use quotes around it! If no such statement is given only global information
7874 =head2 Plugin C<ted>
7876 The I<TED> plugin connects to a device of "The Energy Detective", a device to
7877 measure power consumption. These devices are usually connected to a serial
7878 (RS232) or USB port. The plugin opens a configured device and tries to read the
7879 current energy readings. For more information on TED, visit
7880 L<http://www.theenergydetective.com/>.
7882 Available configuration options:
7886 =item B<Device> I<Path>
7888 Path to the device on which TED is connected. collectd will need read and write
7889 permissions on that file.
7891 Default: B</dev/ttyUSB0>
7893 =item B<Retries> I<Num>
7895 Apparently reading from TED is not that reliable. You can therefore configure a
7896 number of retries here. You only configure the I<retries> here, to if you
7897 specify zero, one reading will be performed (but no retries if that fails); if
7898 you specify three, a maximum of four readings are performed. Negative values
7905 =head2 Plugin C<tcpconns>
7907 The C<tcpconns plugin> counts the number of currently established TCP
7908 connections based on the local port and/or the remote port. Since there may be
7909 a lot of connections the default if to count all connections with a local port,
7910 for which a listening socket is opened. You can use the following options to
7911 fine-tune the ports you are interested in:
7915 =item B<ListeningPorts> I<true>|I<false>
7917 If this option is set to I<true>, statistics for all local ports for which a
7918 listening socket exists are collected. The default depends on B<LocalPort> and
7919 B<RemotePort> (see below): If no port at all is specifically selected, the
7920 default is to collect listening ports. If specific ports (no matter if local or
7921 remote ports) are selected, this option defaults to I<false>, i.E<nbsp>e. only
7922 the selected ports will be collected unless this option is set to I<true>
7925 =item B<LocalPort> I<Port>
7927 Count the connections to a specific local port. This can be used to see how
7928 many connections are handled by a specific daemon, e.E<nbsp>g. the mailserver.
7929 You have to specify the port in numeric form, so for the mailserver example
7930 you'd need to set B<25>.
7932 =item B<RemotePort> I<Port>
7934 Count the connections to a specific remote port. This is useful to see how
7935 much a remote service is used. This is most useful if you want to know how many
7936 connections a local service has opened to remote services, e.E<nbsp>g. how many
7937 connections a mail server or news server has to other mail or news servers, or
7938 how many connections a web proxy holds to web servers. You have to give the
7939 port in numeric form.
7941 =item B<AllPortsSummary> I<true>|I<false>
7943 If this option is set to I<true> a summary of statistics from all connections
7944 are collected. This option defaults to I<false>.
7948 =head2 Plugin C<thermal>
7952 =item B<ForceUseProcfs> I<true>|I<false>
7954 By default, the I<Thermal plugin> tries to read the statistics from the Linux
7955 C<sysfs> interface. If that is not available, the plugin falls back to the
7956 C<procfs> interface. By setting this option to I<true>, you can force the
7957 plugin to use the latter. This option defaults to I<false>.
7959 =item B<Device> I<Device>
7961 Selects the name of the thermal device that you want to collect or ignore,
7962 depending on the value of the B<IgnoreSelected> option. This option may be
7963 used multiple times to specify a list of devices.
7965 See F</"IGNORELISTS"> for details.
7967 =item B<IgnoreSelected> I<true>|I<false>
7969 Invert the selection: If set to true, all devices B<except> the ones that
7970 match the device names specified by the B<Device> option are collected. By
7971 default only selected devices are collected if a selection is made. If no
7972 selection is configured at all, B<all> devices are selected.
7976 =head2 Plugin C<threshold>
7978 The I<Threshold plugin> checks values collected or received by I<collectd>
7979 against a configurable I<threshold> and issues I<notifications> if values are
7982 Documentation for this plugin is available in the L<collectd-threshold(5)>
7985 =head2 Plugin C<tokyotyrant>
7987 The I<TokyoTyrant plugin> connects to a TokyoTyrant server and collects a
7988 couple metrics: number of records, and database size on disk.
7992 =item B<Host> I<Hostname/IP>
7994 The hostname or IP which identifies the server.
7995 Default: B<127.0.0.1>
7997 =item B<Port> I<Service/Port>
7999 The query port of the server. This needs to be a string, even if the port is
8000 given in its numeric form.
8005 =head2 Plugin C<turbostat>
8007 The I<Turbostat plugin> reads CPU frequency and C-state residency on modern
8008 Intel processors by using I<Model Specific Registers>.
8012 =item B<CoreCstates> I<Bitmask(Integer)>
8014 Bit mask of the list of core C-states supported by the processor.
8015 This option should only be used if the automated detection fails.
8016 Default value extracted from the CPU model and family.
8018 Currently supported C-states (by this plugin): 3, 6, 7
8022 All states (3, 6 and 7):
8023 (1<<3) + (1<<6) + (1<<7) = 392
8025 =item B<PackageCstates> I<Bitmask(Integer)>
8027 Bit mask of the list of packages C-states supported by the processor. This
8028 option should only be used if the automated detection fails. Default value
8029 extracted from the CPU model and family.
8031 Currently supported C-states (by this plugin): 2, 3, 6, 7, 8, 9, 10
8035 States 2, 3, 6 and 7:
8036 (1<<2) + (1<<3) + (1<<6) + (1<<7) = 396
8038 =item B<SystemManagementInterrupt> I<true>|I<false>
8040 Boolean enabling the collection of the I/O System-Management Interrupt counter.
8041 This option should only be used if the automated detection fails or if you want
8042 to disable this feature.
8044 =item B<DigitalTemperatureSensor> I<true>|I<false>
8046 Boolean enabling the collection of the temperature of each core. This option
8047 should only be used if the automated detection fails or if you want to disable
8050 =item B<TCCActivationTemp> I<Temperature>
8052 I<Thermal Control Circuit Activation Temperature> of the installed CPU. This
8053 temperature is used when collecting the temperature of cores or packages. This
8054 option should only be used if the automated detection fails. Default value
8055 extracted from B<MSR_IA32_TEMPERATURE_TARGET>.
8057 =item B<RunningAveragePowerLimit> I<Bitmask(Integer)>
8059 Bit mask of the list of elements to be thermally monitored. This option should
8060 only be used if the automated detection fails or if you want to disable some
8061 collections. The different bits of this bit mask accepted by this plugin are:
8065 =item 0 ('1'): Package
8069 =item 2 ('4'): Cores
8071 =item 3 ('8'): Embedded graphic device
8075 =item B<LogicalCoreNames> I<true>|I<false>
8077 Boolean enabling the use of logical core numbering for per core statistics.
8078 When enabled, C<cpuE<lt>nE<gt>> is used as plugin instance, where I<n> is a
8079 sequential number assigned by the kernel. Otherwise, C<coreE<lt>nE<gt>> is used
8080 where I<n> is the n-th core of the socket, causing name conflicts when there is
8081 more than one socket.
8085 =head2 Plugin C<unixsock>
8089 =item B<SocketFile> I<Path>
8091 Sets the socket-file which is to be created.
8093 =item B<SocketGroup> I<Group>
8095 If running as root change the group of the UNIX-socket after it has been
8096 created. Defaults to B<collectd>.
8098 =item B<SocketPerms> I<Permissions>
8100 Change the file permissions of the UNIX-socket after it has been created. The
8101 permissions must be given as a numeric, octal value as you would pass to
8102 L<chmod(1)>. Defaults to B<0770>.
8104 =item B<DeleteSocket> B<false>|B<true>
8106 If set to B<true>, delete the socket file before calling L<bind(2)>, if a file
8107 with the given name already exists. If I<collectd> crashes a socket file may be
8108 left over, preventing the daemon from opening a new socket when restarted.
8109 Since this is potentially dangerous, this defaults to B<false>.
8113 =head2 Plugin C<uuid>
8115 This plugin, if loaded, causes the Hostname to be taken from the machine's
8116 UUID. The UUID is a universally unique designation for the machine, usually
8117 taken from the machine's BIOS. This is most useful if the machine is running in
8118 a virtual environment such as Xen, in which case the UUID is preserved across
8119 shutdowns and migration.
8121 The following methods are used to find the machine's UUID, in order:
8127 Check I</etc/uuid> (or I<UUIDFile>).
8131 Check for UUID from HAL (L<http://www.freedesktop.org/wiki/Software/hal>) if
8136 Check for UUID from C<dmidecode> / SMBIOS.
8140 Check for UUID from Xen hypervisor.
8144 If no UUID can be found then the hostname is not modified.
8148 =item B<UUIDFile> I<Path>
8150 Take the UUID from the given file (default I</etc/uuid>).
8154 =head2 Plugin C<varnish>
8156 The I<varnish plugin> collects information about Varnish, an HTTP accelerator.
8157 It collects a subset of the values displayed by L<varnishstat(1)>, and
8158 organizes them in categories which can be enabled or disabled. Currently only
8159 metrics shown in L<varnishstat(1)>'s I<MAIN> section are collected. The exact
8160 meaning of each metric can be found in L<varnish-counters(7)>.
8165 <Instance "example">
8169 CollectConnections true
8170 CollectDirectorDNS false
8174 CollectObjects false
8176 CollectSession false
8186 CollectWorkers false
8190 The configuration consists of one or more E<lt>B<Instance>E<nbsp>I<Name>E<gt>
8191 blocks. I<Name> is the parameter passed to "varnishd -n". If left empty, it
8192 will collectd statistics from the default "varnishd" instance (this should work
8193 fine in most cases).
8195 Inside each E<lt>B<Instance>E<gt> blocks, the following options are recognized:
8199 =item B<CollectBackend> B<true>|B<false>
8201 Back-end connection statistics, such as successful, reused,
8202 and closed connections. True by default.
8204 =item B<CollectBan> B<true>|B<false>
8206 Statistics about ban operations, such as number of bans added, retired, and
8207 number of objects tested against ban operations. Only available with Varnish
8208 3.x and above. False by default.
8210 =item B<CollectCache> B<true>|B<false>
8212 Cache hits and misses. True by default.
8214 =item B<CollectConnections> B<true>|B<false>
8216 Number of client connections received, accepted and dropped. True by default.
8218 =item B<CollectDirectorDNS> B<true>|B<false>
8220 DNS director lookup cache statistics. Only available with Varnish 3.x. False by
8223 =item B<CollectESI> B<true>|B<false>
8225 Edge Side Includes (ESI) parse statistics. False by default.
8227 =item B<CollectFetch> B<true>|B<false>
8229 Statistics about fetches (HTTP requests sent to the backend). False by default.
8231 =item B<CollectHCB> B<true>|B<false>
8233 Inserts and look-ups in the crit bit tree based hash. Look-ups are
8234 divided into locked and unlocked look-ups. False by default.
8236 =item B<CollectObjects> B<true>|B<false>
8238 Statistics on cached objects: number of objects expired, nuked (prematurely
8239 expired), saved, moved, etc. False by default.
8241 =item B<CollectPurge> B<true>|B<false>
8243 Statistics about purge operations, such as number of purges added, retired, and
8244 number of objects tested against purge operations. Only available with Varnish
8245 2.x. False by default.
8247 =item B<CollectSession> B<true>|B<false>
8249 Client session statistics. Number of past and current sessions, session herd and
8250 linger counters, etc. False by default. Note that if using Varnish 4.x, some
8251 metrics found in the Connections and Threads sections with previous versions of
8252 Varnish have been moved here.
8254 =item B<CollectSHM> B<true>|B<false>
8256 Statistics about the shared memory log, a memory region to store
8257 log messages which is flushed to disk when full. True by default.
8259 =item B<CollectSMA> B<true>|B<false>
8261 malloc or umem (umem_alloc(3MALLOC) based) storage statistics. The umem storage
8262 component is Solaris specific. Only available with Varnish 2.x. False by
8265 =item B<CollectSMS> B<true>|B<false>
8267 synth (synthetic content) storage statistics. This storage
8268 component is used internally only. False by default.
8270 =item B<CollectSM> B<true>|B<false>
8272 file (memory mapped file) storage statistics. Only available with Varnish 2.x.
8275 =item B<CollectStruct> B<true>|B<false>
8277 Current varnish internal state statistics. Number of current sessions, objects
8278 in cache store, open connections to backends (with Varnish 2.x), etc. False by
8281 =item B<CollectTotals> B<true>|B<false>
8283 Collects overview counters, such as the number of sessions created,
8284 the number of requests and bytes transferred. False by default.
8286 =item B<CollectUptime> B<true>|B<false>
8288 Varnish uptime. Only available with Varnish 3.x and above. False by default.
8290 =item B<CollectVCL> B<true>|B<false>
8292 Number of total (available + discarded) VCL (config files). False by default.
8294 =item B<CollectVSM> B<true>|B<false>
8296 Collect statistics about Varnish's shared memory usage (used by the logging and
8297 statistics subsystems). Only available with Varnish 4.x. False by default.
8299 =item B<CollectWorkers> B<true>|B<false>
8301 Collect statistics about worker threads. False by default.
8305 =head2 Plugin C<virt>
8307 This plugin allows CPU, disk, network load and other metrics to be collected for
8308 virtualized guests on the machine. The statistics are collected through libvirt
8309 API (L<http://libvirt.org/>). Majority of metrics can be gathered without
8310 installing any additional software on guests, especially I<collectd>, which runs
8311 only on the host system.
8313 Only I<Connection> is required.
8317 =item B<Connection> I<uri>
8319 Connect to the hypervisor given by I<uri>. For example if using Xen use:
8321 Connection "xen:///"
8323 Details which URIs allowed are given at L<http://libvirt.org/uri.html>.
8325 =item B<RefreshInterval> I<seconds>
8327 Refresh the list of domains and devices every I<seconds>. The default is 60
8328 seconds. Setting this to be the same or smaller than the I<Interval> will cause
8329 the list of domains and devices to be refreshed on every iteration.
8331 Refreshing the devices in particular is quite a costly operation, so if your
8332 virtualization setup is static you might consider increasing this. If this
8333 option is set to 0, refreshing is disabled completely.
8335 =item B<Domain> I<name>
8337 =item B<BlockDevice> I<name:dev>
8339 =item B<InterfaceDevice> I<name:dev>
8341 =item B<IgnoreSelected> B<true>|B<false>
8343 Select which domains and devices are collected.
8345 If I<IgnoreSelected> is not given or B<false> then only the listed domains and
8346 disk/network devices are collected.
8348 If I<IgnoreSelected> is B<true> then the test is reversed and the listed
8349 domains and disk/network devices are ignored, while the rest are collected.
8351 The domain name and device names may use a regular expression, if the name is
8352 surrounded by I</.../> and collectd was compiled with support for regexps.
8354 The default is to collect statistics for all domains and all their devices.
8358 BlockDevice "/:hdb/"
8359 IgnoreSelected "true"
8361 Ignore all I<hdb> devices on any domain, but other block devices (eg. I<hda>)
8364 =item B<BlockDeviceFormat> B<target>|B<source>
8366 If I<BlockDeviceFormat> is set to B<target>, the default, then the device name
8367 seen by the guest will be used for reporting metrics.
8368 This corresponds to the C<E<lt>targetE<gt>> node in the XML definition of the
8371 If I<BlockDeviceFormat> is set to B<source>, then metrics will be reported
8372 using the path of the source, e.g. an image file.
8373 This corresponds to the C<E<lt>sourceE<gt>> node in the XML definition of the
8378 If the domain XML have the following device defined:
8380 <disk type='block' device='disk'>
8381 <driver name='qemu' type='raw' cache='none' io='native' discard='unmap'/>
8382 <source dev='/var/lib/libvirt/images/image1.qcow2'/>
8383 <target dev='sda' bus='scsi'/>
8385 <address type='drive' controller='0' bus='0' target='0' unit='0'/>
8388 Setting C<BlockDeviceFormat target> will cause the I<type instance> to be set
8390 Setting C<BlockDeviceFormat source> will cause the I<type instance> to be set
8391 to C<var_lib_libvirt_images_image1.qcow2>.
8393 =item B<BlockDeviceFormatBasename> B<false>|B<true>
8395 The B<BlockDeviceFormatBasename> controls whether the full path or the
8396 L<basename(1)> of the source is being used as the I<type instance> when
8397 B<BlockDeviceFormat> is set to B<source>. Defaults to B<false>.
8401 Assume the device path (source tag) is C</var/lib/libvirt/images/image1.qcow2>.
8402 Setting C<BlockDeviceFormatBasename false> will cause the I<type instance> to
8403 be set to C<var_lib_libvirt_images_image1.qcow2>.
8404 Setting C<BlockDeviceFormatBasename true> will cause the I<type instance> to be
8405 set to C<image1.qcow2>.
8407 =item B<HostnameFormat> B<name|uuid|hostname|...>
8409 When the virt plugin logs data, it sets the hostname of the collected data
8410 according to this setting. The default is to use the guest name as provided by
8411 the hypervisor, which is equal to setting B<name>.
8413 B<uuid> means use the guest's UUID. This is useful if you want to track the
8414 same guest across migrations.
8416 B<hostname> means to use the global B<Hostname> setting, which is probably not
8417 useful on its own because all guests will appear to have the same name.
8419 You can also specify combinations of these fields. For example B<name uuid>
8420 means to concatenate the guest name and UUID (with a literal colon character
8421 between, thus I<"foo:1234-1234-1234-1234">).
8423 At the moment of writing (collectd-5.5), hostname string is limited to 62
8424 characters. In case when combination of fields exceeds 62 characters,
8425 hostname will be truncated without a warning.
8427 =item B<InterfaceFormat> B<name>|B<address>
8429 When the virt plugin logs interface data, it sets the name of the collected
8430 data according to this setting. The default is to use the path as provided by
8431 the hypervisor (the "dev" property of the target node), which is equal to
8434 B<address> means use the interface's mac address. This is useful since the
8435 interface path might change between reboots of a guest or across migrations.
8437 =item B<PluginInstanceFormat> B<name|uuid|none>
8439 When the virt plugin logs data, it sets the plugin_instance of the collected
8440 data according to this setting. The default is to not set the plugin_instance.
8442 B<name> means use the guest's name as provided by the hypervisor.
8443 B<uuid> means use the guest's UUID.
8445 You can also specify combinations of the B<name> and B<uuid> fields.
8446 For example B<name uuid> means to concatenate the guest name and UUID
8447 (with a literal colon character between, thus I<"foo:1234-1234-1234-1234">).
8449 =item B<Instances> B<integer>
8451 How many read instances you want to use for this plugin. The default is one,
8452 and the sensible setting is a multiple of the B<ReadThreads> value.
8453 If you are not sure, just use the default setting.
8455 =item B<ExtraStats> B<string>
8457 Report additional extra statistics. The default is no extra statistics, preserving
8458 the previous behaviour of the plugin. If unsure, leave the default. If enabled,
8459 allows the plugin to reported more detailed statistics about the behaviour of
8460 Virtual Machines. The argument is a space-separated list of selectors.
8462 Currently supported selectors are:
8466 =item B<cpu_util>: report CPU utilization per domain in percentage.
8468 =item B<disk>: report extra statistics like number of flush operations and total
8469 service time for read, write and flush operations. Requires libvirt API version
8472 =item B<disk_err>: report disk errors if any occured. Requires libvirt API version
8475 =item B<domain_state>: report domain state and reason in human-readable format as
8476 a notification. If libvirt API version I<0.9.2> or later is available, domain
8477 reason will be included in notification.
8479 =item B<fs_info>: report file system information as a notification. Requires
8480 libvirt API version I<1.2.11> or later. Can be collected only if I<Guest Agent>
8481 is installed and configured inside VM. Make sure that installed I<Guest Agent>
8482 version supports retrieving file system information.
8484 =item B<job_stats_background>: report statistics about progress of a background
8485 job on a domain. Only one type of job statistics can be collected at the same time.
8486 Requires libvirt API version I<1.2.9> or later.
8488 =item B<job_stats_completed>: report statistics about a recently completed job on
8489 a domain. Only one type of job statistics can be collected at the same time.
8490 Requires libvirt API version I<1.2.9> or later.
8492 =item B<pcpu>: report the physical user/system cpu time consumed by the hypervisor, per-vm.
8493 Requires libvirt API version I<0.9.11> or later.
8495 =item B<perf>: report performance monitoring events. To collect performance
8496 metrics they must be enabled for domain and supported by the platform. Requires
8497 libvirt API version I<1.3.3> or later.
8498 B<Note>: I<perf> metrics can't be collected if I<intel_rdt> plugin is enabled.
8500 =item B<vcpupin>: report pinning of domain VCPUs to host physical CPUs.
8506 =head2 Plugin C<vmem>
8508 The C<vmem> plugin collects information about the usage of virtual memory.
8509 Since the statistics provided by the Linux kernel are very detailed, they are
8510 collected very detailed. However, to get all the details, you have to switch
8511 them on manually. Most people just want an overview over, such as the number of
8512 pages read from swap space.
8516 =item B<Verbose> B<true>|B<false>
8518 Enables verbose collection of information. This will start collecting page
8519 "actions", e.E<nbsp>g. page allocations, (de)activations, steals and so on.
8520 Part of these statistics are collected on a "per zone" basis.
8524 =head2 Plugin C<vserver>
8526 This plugin doesn't have any options. B<VServer> support is only available for
8527 Linux. It cannot yet be found in a vanilla kernel, though. To make use of this
8528 plugin you need a kernel that has B<VServer> support built in, i.E<nbsp>e. you
8529 need to apply the patches and compile your own kernel, which will then provide
8530 the F</proc/virtual> filesystem that is required by this plugin.
8532 The B<VServer> homepage can be found at L<http://linux-vserver.org/>.
8534 B<Note>: The traffic collected by this plugin accounts for the amount of
8535 traffic passing a socket which might be a lot less than the actual on-wire
8536 traffic (e.E<nbsp>g. due to headers and retransmission). If you want to
8537 collect on-wire traffic you could, for example, use the logging facilities of
8538 iptables to feed data for the guest IPs into the iptables plugin.
8540 =head2 Plugin C<write_graphite>
8542 The C<write_graphite> plugin writes data to I<Graphite>, an open-source metrics
8543 storage and graphing project. The plugin connects to I<Carbon>, the data layer
8544 of I<Graphite>, via I<TCP> or I<UDP> and sends data via the "line based"
8545 protocol (per default using portE<nbsp>2003). The data will be sent in blocks
8546 of at most 1428 bytes to minimize the number of network packets.
8550 <Plugin write_graphite>
8560 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
8561 blocks. Inside the B<Node> blocks, the following options are recognized:
8565 =item B<Host> I<Address>
8567 Hostname or address to connect to. Defaults to C<localhost>.
8569 =item B<Port> I<Service>
8571 Service name or port number to connect to. Defaults to C<2003>.
8573 =item B<Protocol> I<String>
8575 Protocol to use when connecting to I<Graphite>. Defaults to C<tcp>.
8577 =item B<ReconnectInterval> I<Seconds>
8579 When set to non-zero, forces the connection to the Graphite backend to be
8580 closed and re-opend periodically. This behavior is desirable in environments
8581 where the connection to the Graphite backend is done through load balancers,
8582 for example. When set to zero, the default, the connetion is kept open for as
8585 =item B<LogSendErrors> B<false>|B<true>
8587 If set to B<true> (the default), logs errors when sending data to I<Graphite>.
8588 If set to B<false>, it will not log the errors. This is especially useful when
8589 using Protocol UDP since many times we want to use the "fire-and-forget"
8590 approach and logging errors fills syslog with unneeded messages.
8592 =item B<Prefix> I<String>
8594 When set, I<String> is added in front of the host name. Dots and whitespace are
8595 I<not> escaped in this string (see B<EscapeCharacter> below).
8597 =item B<Postfix> I<String>
8599 When set, I<String> is appended to the host name. Dots and whitespace are
8600 I<not> escaped in this string (see B<EscapeCharacter> below).
8602 =item B<EscapeCharacter> I<Char>
8604 I<Carbon> uses the dot (C<.>) as escape character and doesn't allow whitespace
8605 in the identifier. The B<EscapeCharacter> option determines which character
8606 dots, whitespace and control characters are replaced with. Defaults to
8609 =item B<StoreRates> B<false>|B<true>
8611 If set to B<true> (the default), convert counter values to rates. If set to
8612 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
8615 =item B<SeparateInstances> B<false>|B<true>
8617 If set to B<true>, the plugin instance and type instance will be in their own
8618 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
8619 default), the plugin and plugin instance (and likewise the type and type
8620 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
8622 =item B<AlwaysAppendDS> B<false>|B<true>
8624 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
8625 identifier. If set to B<false> (the default), this is only done when there is
8628 =item B<PreserveSeparator> B<false>|B<true>
8630 If set to B<false> (the default) the C<.> (dot) character is replaced with
8631 I<EscapeCharacter>. Otherwise, if set to B<true>, the C<.> (dot) character
8632 is preserved, i.e. passed through.
8634 =item B<DropDuplicateFields> B<false>|B<true>
8636 If set to B<true>, detect and remove duplicate components in Graphite metric
8637 names. For example, the metric name C<host.load.load.shortterm> will
8638 be shortened to C<host.load.shortterm>.
8642 =head2 Plugin C<write_log>
8644 The C<write_log> plugin writes metrics as INFO log messages.
8646 This plugin supports two output formats: I<Graphite> and I<JSON>.
8656 =item B<Format> I<Format>
8658 The output format to use. Can be one of C<Graphite> or C<JSON>.
8662 =head2 Plugin C<write_tsdb>
8664 The C<write_tsdb> plugin writes data to I<OpenTSDB>, a scalable open-source
8665 time series database. The plugin connects to a I<TSD>, a masterless, no shared
8666 state daemon that ingests metrics and stores them in HBase. The plugin uses
8667 I<TCP> over the "line based" protocol with a default port 4242. The data will
8668 be sent in blocks of at most 1428 bytes to minimize the number of network
8677 Host "tsd-1.my.domain"
8679 HostTags "status=production"
8683 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
8684 blocks and global directives.
8686 Global directives are:
8690 =item B<ResolveInterval> I<seconds>
8692 =item B<ResolveJitter> I<seconds>
8694 When I<collectd> connects to a TSDB node, it will request the hostname from
8695 DNS. This can become a problem if the TSDB node is unavailable or badly
8696 configured because collectd will request DNS in order to reconnect for every
8697 metric, which can flood your DNS. So you can cache the last value for
8698 I<ResolveInterval> seconds.
8699 Defaults to the I<Interval> of the I<write_tsdb plugin>, e.g. 10E<nbsp>seconds.
8701 You can also define a jitter, a random interval to wait in addition to
8702 I<ResolveInterval>. This prevents all your collectd servers to resolve the
8703 hostname at the same time when the connection fails.
8704 Defaults to the I<Interval> of the I<write_tsdb plugin>, e.g. 10E<nbsp>seconds.
8706 B<Note:> If the DNS resolution has already been successful when the socket
8707 closes, the plugin will try to reconnect immediately with the cached
8708 information. DNS is queried only when the socket is closed for a longer than
8709 I<ResolveInterval> + I<ResolveJitter> seconds.
8713 Inside the B<Node> blocks, the following options are recognized:
8717 =item B<Host> I<Address>
8719 Hostname or address to connect to. Defaults to C<localhost>.
8721 =item B<Port> I<Service>
8723 Service name or port number to connect to. Defaults to C<4242>.
8726 =item B<HostTags> I<String>
8728 When set, I<HostTags> is added to the end of the metric. It is intended to be
8729 used for name=value pairs that the TSD will tag the metric with. Dots and
8730 whitespace are I<not> escaped in this string.
8732 =item B<StoreRates> B<false>|B<true>
8734 If set to B<true>, convert counter values to rates. If set to B<false>
8735 (the default) counter values are stored as is, as an increasing
8738 =item B<AlwaysAppendDS> B<false>|B<true>
8740 If set the B<true>, append the name of the I<Data Source> (DS) to the "metric"
8741 identifier. If set to B<false> (the default), this is only done when there is
8746 =head2 Plugin C<write_mongodb>
8748 The I<write_mongodb plugin> will send values to I<MongoDB>, a schema-less
8753 <Plugin "write_mongodb">
8762 The plugin can send values to multiple instances of I<MongoDB> by specifying
8763 one B<Node> block for each instance. Within the B<Node> blocks, the following
8764 options are available:
8768 =item B<Host> I<Address>
8770 Hostname or address to connect to. Defaults to C<localhost>.
8772 =item B<Port> I<Service>
8774 Service name or port number to connect to. Defaults to C<27017>.
8776 =item B<Timeout> I<Milliseconds>
8778 Set the timeout for each operation on I<MongoDB> to I<Timeout> milliseconds.
8779 Setting this option to zero means no timeout, which is the default.
8781 =item B<StoreRates> B<false>|B<true>
8783 If set to B<true> (the default), convert counter values to rates. If set to
8784 B<false> counter values are stored as is, i.e. as an increasing integer
8787 =item B<Database> I<Database>
8789 =item B<User> I<User>
8791 =item B<Password> I<Password>
8793 Sets the information used when authenticating to a I<MongoDB> database. The
8794 fields are optional (in which case no authentication is attempted), but if you
8795 want to use authentication all three fields must be set.
8799 =head2 Plugin C<write_prometheus>
8801 The I<write_prometheus plugin> implements a tiny webserver that can be scraped
8802 using I<Prometheus>.
8808 =item B<Port> I<Port>
8810 Port the embedded webserver should listen on. Defaults to B<9103>.
8812 =item B<StalenessDelta> I<Seconds>
8814 Time in seconds after which I<Prometheus> considers a metric "stale" if it
8815 hasn't seen any update for it. This value must match the setting in Prometheus.
8816 It defaults to B<300> seconds (5 minutes), same as Prometheus.
8820 I<Prometheus> has a global setting, C<StalenessDelta>, which controls after
8821 which time a metric without updates is considered "stale". This setting
8822 effectively puts an upper limit on the interval in which metrics are reported.
8824 When the I<write_prometheus plugin> encounters a metric with an interval
8825 exceeding this limit, it will inform you, the user, and provide the metric to
8826 I<Prometheus> B<without> a timestamp. That causes I<Prometheus> to consider the
8827 metric "fresh" each time it is scraped, with the time of the scrape being
8828 considered the time of the update. The result is that there appear more
8829 datapoints in I<Prometheus> than were actually created, but at least the metric
8830 doesn't disappear periodically.
8834 =head2 Plugin C<write_http>
8836 This output plugin submits values to an HTTP server using POST requests and
8837 encoding metrics with JSON or using the C<PUTVAL> command described in
8838 L<collectd-unixsock(5)>.
8842 <Plugin "write_http">
8844 URL "http://example.com/post-collectd"
8851 The plugin can send values to multiple HTTP servers by specifying one
8852 E<lt>B<Node>E<nbsp>I<Name>E<gt> block for each server. Within each B<Node>
8853 block, the following options are available:
8859 URL to which the values are submitted to. Mandatory.
8861 =item B<User> I<Username>
8863 Optional user name needed for authentication.
8865 =item B<Password> I<Password>
8867 Optional password needed for authentication.
8869 =item B<VerifyPeer> B<true>|B<false>
8871 Enable or disable peer SSL certificate verification. See
8872 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
8874 =item B<VerifyHost> B<true|false>
8876 Enable or disable peer host name verification. If enabled, the plugin checks if
8877 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
8878 matches the host name provided by the B<URL> option. If this identity check
8879 fails, the connection is aborted. Obviously, only works when connecting to a
8880 SSL enabled server. Enabled by default.
8882 =item B<CACert> I<File>
8884 File that holds one or more SSL certificates. If you want to use HTTPS you will
8885 possibly need this option. What CA certificates come bundled with C<libcurl>
8886 and are checked by default depends on the distribution you use.
8888 =item B<CAPath> I<Directory>
8890 Directory holding one or more CA certificate files. You can use this if for
8891 some reason all the needed CA certificates aren't in the same file and can't be
8892 pointed to using the B<CACert> option. Requires C<libcurl> to be built against
8895 =item B<ClientKey> I<File>
8897 File that holds the private key in PEM format to be used for certificate-based
8900 =item B<ClientCert> I<File>
8902 File that holds the SSL certificate to be used for certificate-based
8905 =item B<ClientKeyPass> I<Password>
8907 Password required to load the private key in B<ClientKey>.
8909 =item B<Header> I<Header>
8911 A HTTP header to add to the request. Multiple headers are added if this option is specified more than once. Example:
8913 Header "X-Custom-Header: custom_value"
8915 =item B<SSLVersion> B<SSLv2>|B<SSLv3>|B<TLSv1>|B<TLSv1_0>|B<TLSv1_1>|B<TLSv1_2>
8917 Define which SSL protocol version must be used. By default C<libcurl> will
8918 attempt to figure out the remote SSL protocol version. See
8919 L<curl_easy_setopt(3)> for more details.
8921 =item B<Format> B<Command>|B<JSON>|B<KAIROSDB>
8923 Format of the output to generate. If set to B<Command>, will create output that
8924 is understood by the I<Exec> and I<UnixSock> plugins. When set to B<JSON>, will
8925 create output in the I<JavaScript Object Notation> (JSON). When set to KAIROSDB
8926 , will create output in the KairosDB format.
8928 Defaults to B<Command>.
8930 =item B<Attribute> I<String> I<String>
8932 Only available for the KAIROSDB output format.
8934 Consider the two given strings to be the key and value of an additional tag for
8935 each metric being sent out.
8937 You can add multiple B<Attribute>.
8941 Only available for the KAIROSDB output format.
8943 Sets the Cassandra ttl for the data points.
8945 Please refer to L<http://kairosdb.github.io/docs/build/html/restapi/AddDataPoints.html?highlight=ttl>
8947 =item B<Metrics> B<true>|B<false>
8949 Controls whether I<metrics> are POSTed to this location. Defaults to B<true>.
8951 =item B<Notifications> B<false>|B<true>
8953 Controls whether I<notifications> are POSTed to this location. Defaults to B<false>.
8955 =item B<StoreRates> B<true|false>
8957 If set to B<true>, convert counter values to rates. If set to B<false> (the
8958 default) counter values are stored as is, i.e. as an increasing integer number.
8960 =item B<BufferSize> I<Bytes>
8962 Sets the send buffer size to I<Bytes>. By increasing this buffer, less HTTP
8963 requests will be generated, but more metrics will be batched / metrics are
8964 cached for longer before being sent, introducing additional delay until they
8965 are available on the server side. I<Bytes> must be at least 1024 and cannot
8966 exceed the size of an C<int>, i.e. 2E<nbsp>GByte.
8967 Defaults to C<4096>.
8969 =item B<LowSpeedLimit> I<Bytes per Second>
8971 Sets the minimal transfer rate in I<Bytes per Second> below which the
8972 connection with the HTTP server will be considered too slow and aborted. All
8973 the data submitted over this connection will probably be lost. Defaults to 0,
8974 which means no minimum transfer rate is enforced.
8976 =item B<Timeout> I<Timeout>
8978 Sets the maximum time in milliseconds given for HTTP POST operations to
8979 complete. When this limit is reached, the POST operation will be aborted, and
8980 all the data in the current send buffer will probably be lost. Defaults to 0,
8981 which means the connection never times out.
8983 =item B<LogHttpError> B<false>|B<true>
8985 Enables printing of HTTP error code to log. Turned off by default.
8987 The C<write_http> plugin regularly submits the collected values to the HTTP
8988 server. How frequently this happens depends on how much data you are collecting
8989 and the size of B<BufferSize>. The optimal value to set B<Timeout> to is
8990 slightly below this interval, which you can estimate by monitoring the network
8991 traffic between collectd and the HTTP server.
8995 =head2 Plugin C<write_kafka>
8997 The I<write_kafka plugin> will send values to a I<Kafka> topic, a distributed
9001 <Plugin "write_kafka">
9002 Property "metadata.broker.list" "broker1:9092,broker2:9092"
9008 The following options are understood by the I<write_kafka plugin>:
9012 =item E<lt>B<Topic> I<Name>E<gt>
9014 The plugin's configuration consists of one or more B<Topic> blocks. Each block
9015 is given a unique I<Name> and specifies one kafka producer.
9016 Inside the B<Topic> block, the following per-topic options are
9021 =item B<Property> I<String> I<String>
9023 Configure the named property for the current topic. Properties are
9024 forwarded to the kafka producer library B<librdkafka>.
9026 =item B<Key> I<String>
9028 Use the specified string as a partitioning key for the topic. Kafka breaks
9029 topic into partitions and guarantees that for a given topology, the same
9030 consumer will be used for a specific key. The special (case insensitive)
9031 string B<Random> can be used to specify that an arbitrary partition should
9034 =item B<Format> B<Command>|B<JSON>|B<Graphite>
9036 Selects the format in which messages are sent to the broker. If set to
9037 B<Command> (the default), values are sent as C<PUTVAL> commands which are
9038 identical to the syntax used by the I<Exec> and I<UnixSock plugins>.
9040 If set to B<JSON>, the values are encoded in the I<JavaScript Object Notation>,
9041 an easy and straight forward exchange format.
9043 If set to B<Graphite>, values are encoded in the I<Graphite> format, which is
9044 C<E<lt>metricE<gt> E<lt>valueE<gt> E<lt>timestampE<gt>\n>.
9046 =item B<StoreRates> B<true>|B<false>
9048 Determines whether or not C<COUNTER>, C<DERIVE> and C<ABSOLUTE> data sources
9049 are converted to a I<rate> (i.e. a C<GAUGE> value). If set to B<false> (the
9050 default), no conversion is performed. Otherwise the conversion is performed
9051 using the internal value cache.
9053 Please note that currently this option is only used if the B<Format> option has
9054 been set to B<JSON>.
9056 =item B<GraphitePrefix> (B<Format>=I<Graphite> only)
9058 A prefix can be added in the metric name when outputting in the I<Graphite>
9059 format. It's added before the I<Host> name.
9061 C<E<lt>prefixE<gt>E<lt>hostE<gt>E<lt>postfixE<gt>E<lt>pluginE<gt>E<lt>typeE<gt>E<lt>nameE<gt>>
9063 =item B<GraphitePostfix> (B<Format>=I<Graphite> only)
9065 A postfix can be added in the metric name when outputting in the I<Graphite>
9066 format. It's added after the I<Host> name.
9068 C<E<lt>prefixE<gt>E<lt>hostE<gt>E<lt>postfixE<gt>E<lt>pluginE<gt>E<lt>typeE<gt>E<lt>nameE<gt>>
9070 =item B<GraphiteEscapeChar> (B<Format>=I<Graphite> only)
9072 Specify a character to replace dots (.) in the host part of the metric name.
9073 In I<Graphite> metric name, dots are used as separators between different
9074 metric parts (host, plugin, type).
9075 Default is C<_> (I<Underscore>).
9077 =item B<GraphiteSeparateInstances> B<false>|B<true>
9079 If set to B<true>, the plugin instance and type instance will be in their own
9080 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
9081 default), the plugin and plugin instance (and likewise the type and type
9082 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
9084 =item B<GraphiteAlwaysAppendDS> B<true>|B<false>
9086 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
9087 identifier. If set to B<false> (the default), this is only done when there is
9090 =item B<GraphitePreserveSeparator> B<false>|B<true>
9092 If set to B<false> (the default) the C<.> (dot) character is replaced with
9093 I<GraphiteEscapeChar>. Otherwise, if set to B<true>, the C<.> (dot) character
9094 is preserved, i.e. passed through.
9096 =item B<StoreRates> B<true>|B<false>
9098 If set to B<true> (the default), convert counter values to rates. If set to
9099 B<false> counter values are stored as is, i.e. as an increasing integer number.
9101 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
9102 converted values will have "rate" appended to the data source type, e.g.
9103 C<ds_type:derive:rate>.
9107 =item B<Property> I<String> I<String>
9109 Configure the kafka producer through properties, you almost always will
9110 want to set B<metadata.broker.list> to your Kafka broker list.
9114 =head2 Plugin C<write_redis>
9116 The I<write_redis plugin> submits values to I<Redis>, a data structure server.
9120 <Plugin "write_redis">
9132 Values are submitted to I<Sorted Sets>, using the metric name as the key, and
9133 the timestamp as the score. Retrieving a date range can then be done using the
9134 C<ZRANGEBYSCORE> I<Redis> command. Additionally, all the identifiers of these
9135 I<Sorted Sets> are kept in a I<Set> called C<collectd/values> (or
9136 C<${prefix}/values> if the B<Prefix> option was specified) and can be retrieved
9137 using the C<SMEMBERS> I<Redis> command. You can specify the database to use
9138 with the B<Database> parameter (default is C<0>). See
9139 L<http://redis.io/commands#sorted_set> and L<http://redis.io/commands#set> for
9142 The information shown in the synopsis above is the I<default configuration>
9143 which is used by the plugin if no configuration is present.
9145 The plugin can send values to multiple instances of I<Redis> by specifying
9146 one B<Node> block for each instance. Within the B<Node> blocks, the following
9147 options are available:
9151 =item B<Node> I<Nodename>
9153 The B<Node> block identifies a new I<Redis> node, that is a new I<Redis>
9154 instance running on a specified host and port. The node name is a
9155 canonical identifier which is used as I<plugin instance>. It is limited to
9156 51E<nbsp>characters in length.
9158 =item B<Host> I<Hostname>
9160 The B<Host> option is the hostname or IP-address where the I<Redis> instance is
9163 =item B<Port> I<Port>
9165 The B<Port> option is the TCP port on which the Redis instance accepts
9166 connections. Either a service name of a port number may be given. Please note
9167 that numerical port numbers must be given as a string, too.
9169 =item B<Timeout> I<Milliseconds>
9171 The B<Timeout> option sets the socket connection timeout, in milliseconds.
9173 =item B<Prefix> I<Prefix>
9175 Prefix used when constructing the name of the I<Sorted Sets> and the I<Set>
9176 containing all metrics. Defaults to C<collectd/>, so metrics will have names
9177 like C<collectd/cpu-0/cpu-user>. When setting this to something different, it
9178 is recommended but not required to include a trailing slash in I<Prefix>.
9180 =item B<Database> I<Index>
9182 This index selects the redis database to use for writing operations. Defaults
9185 =item B<MaxSetSize> I<Items>
9187 The B<MaxSetSize> option limits the number of items that the I<Sorted Sets> can
9188 hold. Negative values for I<Items> sets no limit, which is the default behavior.
9190 =item B<StoreRates> B<true>|B<false>
9192 If set to B<true> (the default), convert counter values to rates. If set to
9193 B<false> counter values are stored as is, i.e. as an increasing integer number.
9197 =head2 Plugin C<write_riemann>
9199 The I<write_riemann plugin> will send values to I<Riemann>, a powerful stream
9200 aggregation and monitoring system. The plugin sends I<Protobuf> encoded data to
9201 I<Riemann> using UDP packets.
9205 <Plugin "write_riemann">
9211 AlwaysAppendDS false
9215 Attribute "foo" "bar"
9218 The following options are understood by the I<write_riemann plugin>:
9222 =item E<lt>B<Node> I<Name>E<gt>
9224 The plugin's configuration consists of one or more B<Node> blocks. Each block
9225 is given a unique I<Name> and specifies one connection to an instance of
9226 I<Riemann>. Indise the B<Node> block, the following per-connection options are
9231 =item B<Host> I<Address>
9233 Hostname or address to connect to. Defaults to C<localhost>.
9235 =item B<Port> I<Service>
9237 Service name or port number to connect to. Defaults to C<5555>.
9239 =item B<Protocol> B<UDP>|B<TCP>|B<TLS>
9241 Specify the protocol to use when communicating with I<Riemann>. Defaults to
9244 =item B<TLSCertFile> I<Path>
9246 When using the B<TLS> protocol, path to a PEM certificate to present
9249 =item B<TLSCAFile> I<Path>
9251 When using the B<TLS> protocol, path to a PEM CA certificate to
9252 use to validate the remote hosts's identity.
9254 =item B<TLSKeyFile> I<Path>
9256 When using the B<TLS> protocol, path to a PEM private key associated
9257 with the certificate defined by B<TLSCertFile>.
9259 =item B<Batch> B<true>|B<false>
9261 If set to B<true> and B<Protocol> is set to B<TCP>,
9262 events will be batched in memory and flushed at
9263 regular intervals or when B<BatchMaxSize> is exceeded.
9265 Notifications are not batched and sent as soon as possible.
9267 When enabled, it can occur that events get processed by the Riemann server
9268 close to or after their expiration time. Tune the B<TTLFactor> and
9269 B<BatchMaxSize> settings according to the amount of values collected, if this
9274 =item B<BatchMaxSize> I<size>
9276 Maximum payload size for a riemann packet. Defaults to 8192
9278 =item B<BatchFlushTimeout> I<seconds>
9280 Maximum amount of seconds to wait in between to batch flushes.
9281 No timeout by default.
9283 =item B<StoreRates> B<true>|B<false>
9285 If set to B<true> (the default), convert counter values to rates. If set to
9286 B<false> counter values are stored as is, i.e. as an increasing integer number.
9288 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
9289 converted values will have "rate" appended to the data source type, e.g.
9290 C<ds_type:derive:rate>.
9292 =item B<AlwaysAppendDS> B<false>|B<true>
9294 If set to B<true>, append the name of the I<Data Source> (DS) to the
9295 "service", i.e. the field that, together with the "host" field, uniquely
9296 identifies a metric in I<Riemann>. If set to B<false> (the default), this is
9297 only done when there is more than one DS.
9299 =item B<TTLFactor> I<Factor>
9301 I<Riemann> events have a I<Time to Live> (TTL) which specifies how long each
9302 event is considered active. I<collectd> populates this field based on the
9303 metrics interval setting. This setting controls the factor with which the
9304 interval is multiplied to set the TTL. The default value is B<2.0>. Unless you
9305 know exactly what you're doing, you should only increase this setting from its
9308 =item B<Notifications> B<false>|B<true>
9310 If set to B<true>, create riemann events for notifications. This is B<true>
9311 by default. When processing thresholds from write_riemann, it might prove
9312 useful to avoid getting notification events.
9314 =item B<CheckThresholds> B<false>|B<true>
9316 If set to B<true>, attach state to events based on thresholds defined
9317 in the B<Threshold> plugin. Defaults to B<false>.
9319 =item B<EventServicePrefix> I<String>
9321 Add the given string as a prefix to the event service name.
9322 If B<EventServicePrefix> not set or set to an empty string (""),
9323 no prefix will be used.
9327 =item B<Tag> I<String>
9329 Add the given string as an additional tag to the metric being sent to
9332 =item B<Attribute> I<String> I<String>
9334 Consider the two given strings to be the key and value of an additional
9335 attribute for each metric being sent out to I<Riemann>.
9339 =head2 Plugin C<write_sensu>
9341 The I<write_sensu plugin> will send values to I<Sensu>, a powerful stream
9342 aggregation and monitoring system. The plugin sends I<JSON> encoded data to
9343 a local I<Sensu> client using a TCP socket.
9345 At the moment, the I<write_sensu plugin> does not send over a collectd_host
9346 parameter so it is not possible to use one collectd instance as a gateway for
9347 others. Each collectd host must pair with one I<Sensu> client.
9351 <Plugin "write_sensu">
9356 AlwaysAppendDS false
9357 MetricHandler "influx"
9358 MetricHandler "default"
9359 NotificationHandler "flapjack"
9360 NotificationHandler "howling_monkey"
9364 Attribute "foo" "bar"
9367 The following options are understood by the I<write_sensu plugin>:
9371 =item E<lt>B<Node> I<Name>E<gt>
9373 The plugin's configuration consists of one or more B<Node> blocks. Each block
9374 is given a unique I<Name> and specifies one connection to an instance of
9375 I<Sensu>. Inside the B<Node> block, the following per-connection options are
9380 =item B<Host> I<Address>
9382 Hostname or address to connect to. Defaults to C<localhost>.
9384 =item B<Port> I<Service>
9386 Service name or port number to connect to. Defaults to C<3030>.
9388 =item B<StoreRates> B<true>|B<false>
9390 If set to B<true> (the default), convert counter values to rates. If set to
9391 B<false> counter values are stored as is, i.e. as an increasing integer number.
9393 This will be reflected in the C<collectd_data_source_type> tag: If
9394 B<StoreRates> is enabled, converted values will have "rate" appended to the
9395 data source type, e.g. C<collectd_data_source_type:derive:rate>.
9397 =item B<AlwaysAppendDS> B<false>|B<true>
9399 If set the B<true>, append the name of the I<Data Source> (DS) to the
9400 "service", i.e. the field that, together with the "host" field, uniquely
9401 identifies a metric in I<Sensu>. If set to B<false> (the default), this is
9402 only done when there is more than one DS.
9404 =item B<Notifications> B<false>|B<true>
9406 If set to B<true>, create I<Sensu> events for notifications. This is B<false>
9407 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
9409 =item B<Metrics> B<false>|B<true>
9411 If set to B<true>, create I<Sensu> events for metrics. This is B<false>
9412 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
9415 =item B<Separator> I<String>
9417 Sets the separator for I<Sensu> metrics name or checks. Defaults to "/".
9419 =item B<MetricHandler> I<String>
9421 Add a handler that will be set when metrics are sent to I<Sensu>. You can add
9422 several of them, one per line. Defaults to no handler.
9424 =item B<NotificationHandler> I<String>
9426 Add a handler that will be set when notifications are sent to I<Sensu>. You can
9427 add several of them, one per line. Defaults to no handler.
9429 =item B<EventServicePrefix> I<String>
9431 Add the given string as a prefix to the event service name.
9432 If B<EventServicePrefix> not set or set to an empty string (""),
9433 no prefix will be used.
9437 =item B<Tag> I<String>
9439 Add the given string as an additional tag to the metric being sent to
9442 =item B<Attribute> I<String> I<String>
9444 Consider the two given strings to be the key and value of an additional
9445 attribute for each metric being sent out to I<Sensu>.
9449 =head2 Plugin C<xencpu>
9451 This plugin collects metrics of hardware CPU load for machine running Xen
9452 hypervisor. Load is calculated from 'idle time' value, provided by Xen.
9453 Result is reported using the C<percent> type, for each CPU (core).
9455 This plugin doesn't have any options (yet).
9457 =head2 Plugin C<zookeeper>
9459 The I<zookeeper plugin> will collect statistics from a I<Zookeeper> server
9460 using the mntr command. It requires Zookeeper 3.4.0+ and access to the
9465 <Plugin "zookeeper">
9472 =item B<Host> I<Address>
9474 Hostname or address to connect to. Defaults to C<localhost>.
9476 =item B<Port> I<Service>
9478 Service name or port number to connect to. Defaults to C<2181>.
9482 =head1 THRESHOLD CONFIGURATION
9484 Starting with version C<4.3.0> collectd has support for B<monitoring>. By that
9485 we mean that the values are not only stored or sent somewhere, but that they
9486 are judged and, if a problem is recognized, acted upon. The only action
9487 collectd takes itself is to generate and dispatch a "notification". Plugins can
9488 register to receive notifications and perform appropriate further actions.
9490 Since systems and what you expect them to do differ a lot, you can configure
9491 B<thresholds> for your values freely. This gives you a lot of flexibility but
9492 also a lot of responsibility.
9494 Every time a value is out of range a notification is dispatched. This means
9495 that the idle percentage of your CPU needs to be less then the configured
9496 threshold only once for a notification to be generated. There's no such thing
9497 as a moving average or similar - at least not now.
9499 Also, all values that match a threshold are considered to be relevant or
9500 "interesting". As a consequence collectd will issue a notification if they are
9501 not received for B<Timeout> iterations. The B<Timeout> configuration option is
9502 explained in section L<"GLOBAL OPTIONS">. If, for example, B<Timeout> is set to
9503 "2" (the default) and some hosts sends it's CPU statistics to the server every
9504 60 seconds, a notification will be dispatched after about 120 seconds. It may
9505 take a little longer because the timeout is checked only once each B<Interval>
9508 When a value comes within range again or is received after it was missing, an
9509 "OKAY-notification" is dispatched.
9511 Here is a configuration example to get you started. Read below for more
9524 <Plugin "interface">
9541 WarningMin 100000000
9547 There are basically two types of configuration statements: The C<Host>,
9548 C<Plugin>, and C<Type> blocks select the value for which a threshold should be
9549 configured. The C<Plugin> and C<Type> blocks may be specified further using the
9550 C<Instance> option. You can combine the block by nesting the blocks, though
9551 they must be nested in the above order, i.E<nbsp>e. C<Host> may contain either
9552 C<Plugin> and C<Type> blocks, C<Plugin> may only contain C<Type> blocks and
9553 C<Type> may not contain other blocks. If multiple blocks apply to the same
9554 value the most specific block is used.
9556 The other statements specify the threshold to configure. They B<must> be
9557 included in a C<Type> block. Currently the following statements are recognized:
9561 =item B<FailureMax> I<Value>
9563 =item B<WarningMax> I<Value>
9565 Sets the upper bound of acceptable values. If unset defaults to positive
9566 infinity. If a value is greater than B<FailureMax> a B<FAILURE> notification
9567 will be created. If the value is greater than B<WarningMax> but less than (or
9568 equal to) B<FailureMax> a B<WARNING> notification will be created.
9570 =item B<FailureMin> I<Value>
9572 =item B<WarningMin> I<Value>
9574 Sets the lower bound of acceptable values. If unset defaults to negative
9575 infinity. If a value is less than B<FailureMin> a B<FAILURE> notification will
9576 be created. If the value is less than B<WarningMin> but greater than (or equal
9577 to) B<FailureMin> a B<WARNING> notification will be created.
9579 =item B<DataSource> I<DSName>
9581 Some data sets have more than one "data source". Interesting examples are the
9582 C<if_octets> data set, which has received (C<rx>) and sent (C<tx>) bytes and
9583 the C<disk_ops> data set, which holds C<read> and C<write> operations. The
9584 system load data set, C<load>, even has three data sources: C<shortterm>,
9585 C<midterm>, and C<longterm>.
9587 Normally, all data sources are checked against a configured threshold. If this
9588 is undesirable, or if you want to specify different limits for each data
9589 source, you can use the B<DataSource> option to have a threshold apply only to
9592 =item B<Invert> B<true>|B<false>
9594 If set to B<true> the range of acceptable values is inverted, i.E<nbsp>e.
9595 values between B<FailureMin> and B<FailureMax> (B<WarningMin> and
9596 B<WarningMax>) are not okay. Defaults to B<false>.
9598 =item B<Persist> B<true>|B<false>
9600 Sets how often notifications are generated. If set to B<true> one notification
9601 will be generated for each value that is out of the acceptable range. If set to
9602 B<false> (the default) then a notification is only generated if a value is out
9603 of range but the previous value was okay.
9605 This applies to missing values, too: If set to B<true> a notification about a
9606 missing value is generated once every B<Interval> seconds. If set to B<false>
9607 only one such notification is generated until the value appears again.
9609 =item B<Percentage> B<true>|B<false>
9611 If set to B<true>, the minimum and maximum values given are interpreted as
9612 percentage value, relative to the other data sources. This is helpful for
9613 example for the "df" type, where you may want to issue a warning when less than
9614 5E<nbsp>% of the total space is available. Defaults to B<false>.
9616 =item B<Hits> I<Number>
9618 Delay creating the notification until the threshold has been passed I<Number>
9619 times. When a notification has been generated, or when a subsequent value is
9620 inside the threshold, the counter is reset. If, for example, a value is
9621 collected once every 10E<nbsp>seconds and B<Hits> is set to 3, a notification
9622 will be dispatched at most once every 30E<nbsp>seconds.
9624 This is useful when short bursts are not a problem. If, for example, 100% CPU
9625 usage for up to a minute is normal (and data is collected every
9626 10E<nbsp>seconds), you could set B<Hits> to B<6> to account for this.
9628 =item B<Hysteresis> I<Number>
9630 When set to non-zero, a hysteresis value is applied when checking minimum and
9631 maximum bounds. This is useful for values that increase slowly and fluctuate a
9632 bit while doing so. When these values come close to the threshold, they may
9633 "flap", i.e. switch between failure / warning case and okay case repeatedly.
9635 If, for example, the threshold is configures as
9640 then a I<Warning> notification is created when the value exceeds I<101> and the
9641 corresponding I<Okay> notification is only created once the value falls below
9642 I<99>, thus avoiding the "flapping".
9646 =head1 FILTER CONFIGURATION
9648 Starting with collectd 4.6 there is a powerful filtering infrastructure
9649 implemented in the daemon. The concept has mostly been copied from
9650 I<ip_tables>, the packet filter infrastructure for Linux. We'll use a similar
9651 terminology, so that users that are familiar with iptables feel right at home.
9655 The following are the terms used in the remainder of the filter configuration
9656 documentation. For an ASCII-art schema of the mechanism, see
9657 L<"General structure"> below.
9663 A I<match> is a criteria to select specific values. Examples are, of course, the
9664 name of the value or it's current value.
9666 Matches are implemented in plugins which you have to load prior to using the
9667 match. The name of such plugins starts with the "match_" prefix.
9671 A I<target> is some action that is to be performed with data. Such actions
9672 could, for example, be to change part of the value's identifier or to ignore
9673 the value completely.
9675 Some of these targets are built into the daemon, see L<"Built-in targets">
9676 below. Other targets are implemented in plugins which you have to load prior to
9677 using the target. The name of such plugins starts with the "target_" prefix.
9681 The combination of any number of matches and at least one target is called a
9682 I<rule>. The target actions will be performed for all values for which B<all>
9683 matches apply. If the rule does not have any matches associated with it, the
9684 target action will be performed for all values.
9688 A I<chain> is a list of rules and possibly default targets. The rules are tried
9689 in order and if one matches, the associated target will be called. If a value
9690 is handled by a rule, it depends on the target whether or not any subsequent
9691 rules are considered or if traversal of the chain is aborted, see
9692 L<"Flow control"> below. After all rules have been checked, the default targets
9697 =head2 General structure
9699 The following shows the resulting structure:
9706 +---------+ +---------+ +---------+ +---------+
9707 ! Rule !->! Match !->! Match !->! Target !
9708 +---------+ +---------+ +---------+ +---------+
9711 +---------+ +---------+ +---------+
9712 ! Rule !->! Target !->! Target !
9713 +---------+ +---------+ +---------+
9720 +---------+ +---------+ +---------+
9721 ! Rule !->! Match !->! Target !
9722 +---------+ +---------+ +---------+
9732 There are four ways to control which way a value takes through the filter
9739 The built-in B<jump> target can be used to "call" another chain, i.E<nbsp>e.
9740 process the value with another chain. When the called chain finishes, usually
9741 the next target or rule after the jump is executed.
9745 The stop condition, signaled for example by the built-in target B<stop>, causes
9746 all processing of the value to be stopped immediately.
9750 Causes processing in the current chain to be aborted, but processing of the
9751 value generally will continue. This means that if the chain was called via
9752 B<Jump>, the next target or rule after the jump will be executed. If the chain
9753 was not called by another chain, control will be returned to the daemon and it
9754 may pass the value to another chain.
9758 Most targets will signal the B<continue> condition, meaning that processing
9759 should continue normally. There is no special built-in target for this
9766 The configuration reflects this structure directly:
9768 PostCacheChain "PostCache"
9770 <Rule "ignore_mysql_show">
9773 Type "^mysql_command$"
9774 TypeInstance "^show_"
9784 The above configuration example will ignore all values where the plugin field
9785 is "mysql", the type is "mysql_command" and the type instance begins with
9786 "show_". All other values will be sent to the C<rrdtool> write plugin via the
9787 default target of the chain. Since this chain is run after the value has been
9788 added to the cache, the MySQL C<show_*> command statistics will be available
9789 via the C<unixsock> plugin.
9791 =head2 List of configuration options
9795 =item B<PreCacheChain> I<ChainName>
9797 =item B<PostCacheChain> I<ChainName>
9799 Configure the name of the "pre-cache chain" and the "post-cache chain". The
9800 argument is the name of a I<chain> that should be executed before and/or after
9801 the values have been added to the cache.
9803 To understand the implications, it's important you know what is going on inside
9804 I<collectd>. The following diagram shows how values are passed from the
9805 read-plugins to the write-plugins:
9811 + - - - - V - - - - +
9812 : +---------------+ :
9815 : +-------+-------+ :
9818 : +-------+-------+ : +---------------+
9819 : ! Cache !--->! Value Cache !
9820 : ! insert ! : +---+---+-------+
9821 : +-------+-------+ : ! !
9822 : ! ,------------' !
9824 : +-------+---+---+ : +-------+-------+
9825 : ! Post-Cache +--->! Write-Plugins !
9826 : ! Chain ! : +---------------+
9827 : +---------------+ :
9830 + - - - - - - - - - +
9832 After the values are passed from the "read" plugins to the dispatch functions,
9833 the pre-cache chain is run first. The values are added to the internal cache
9834 afterwards. The post-cache chain is run after the values have been added to the
9835 cache. So why is it such a huge deal if chains are run before or after the
9836 values have been added to this cache?
9838 Targets that change the identifier of a value list should be executed before
9839 the values are added to the cache, so that the name in the cache matches the
9840 name that is used in the "write" plugins. The C<unixsock> plugin, too, uses
9841 this cache to receive a list of all available values. If you change the
9842 identifier after the value list has been added to the cache, this may easily
9843 lead to confusion, but it's not forbidden of course.
9845 The cache is also used to convert counter values to rates. These rates are, for
9846 example, used by the C<value> match (see below). If you use the rate stored in
9847 the cache B<before> the new value is added, you will use the old, B<previous>
9848 rate. Write plugins may use this rate, too, see the C<csv> plugin, for example.
9849 The C<unixsock> plugin uses these rates too, to implement the C<GETVAL>
9852 Last but not last, the B<stop> target makes a difference: If the pre-cache
9853 chain returns the stop condition, the value will not be added to the cache and
9854 the post-cache chain will not be run.
9856 =item B<Chain> I<Name>
9858 Adds a new chain with a certain name. This name can be used to refer to a
9859 specific chain, for example to jump to it.
9861 Within the B<Chain> block, there can be B<Rule> blocks and B<Target> blocks.
9863 =item B<Rule> [I<Name>]
9865 Adds a new rule to the current chain. The name of the rule is optional and
9866 currently has no meaning for the daemon.
9868 Within the B<Rule> block, there may be any number of B<Match> blocks and there
9869 must be at least one B<Target> block.
9871 =item B<Match> I<Name>
9873 Adds a match to a B<Rule> block. The name specifies what kind of match should
9874 be performed. Available matches depend on the plugins that have been loaded.
9876 The arguments inside the B<Match> block are passed to the plugin implementing
9877 the match, so which arguments are valid here depends on the plugin being used.
9878 If you do not need any to pass any arguments to a match, you can use the
9883 Which is equivalent to:
9888 =item B<Target> I<Name>
9890 Add a target to a rule or a default target to a chain. The name specifies what
9891 kind of target is to be added. Which targets are available depends on the
9892 plugins being loaded.
9894 The arguments inside the B<Target> block are passed to the plugin implementing
9895 the target, so which arguments are valid here depends on the plugin being used.
9896 If you do not need any to pass any arguments to a target, you can use the
9901 This is the same as writing:
9908 =head2 Built-in targets
9910 The following targets are built into the core daemon and therefore need no
9911 plugins to be loaded:
9917 Signals the "return" condition, see the L<"Flow control"> section above. This
9918 causes the current chain to stop processing the value and returns control to
9919 the calling chain. The calling chain will continue processing targets and rules
9920 just after the B<jump> target (see below). This is very similar to the
9921 B<RETURN> target of iptables, see L<iptables(8)>.
9923 This target does not have any options.
9931 Signals the "stop" condition, see the L<"Flow control"> section above. This
9932 causes processing of the value to be aborted immediately. This is similar to
9933 the B<DROP> target of iptables, see L<iptables(8)>.
9935 This target does not have any options.
9943 Sends the value to "write" plugins.
9949 =item B<Plugin> I<Name>
9951 Name of the write plugin to which the data should be sent. This option may be
9952 given multiple times to send the data to more than one write plugin. If the
9953 plugin supports multiple instances, the plugin's instance(s) must also be
9958 If no plugin is explicitly specified, the values will be sent to all available
9961 Single-instance plugin example:
9967 Multi-instance plugin example:
9969 <Plugin "write_graphite">
9979 Plugin "write_graphite/foo"
9984 Starts processing the rules of another chain, see L<"Flow control"> above. If
9985 the end of that chain is reached, or a stop condition is encountered,
9986 processing will continue right after the B<jump> target, i.E<nbsp>e. with the
9987 next target or the next rule. This is similar to the B<-j> command line option
9988 of iptables, see L<iptables(8)>.
9994 =item B<Chain> I<Name>
9996 Jumps to the chain I<Name>. This argument is required and may appear only once.
10008 =head2 Available matches
10014 Matches a value using regular expressions.
10020 =item B<Host> I<Regex>
10022 =item B<Plugin> I<Regex>
10024 =item B<PluginInstance> I<Regex>
10026 =item B<Type> I<Regex>
10028 =item B<TypeInstance> I<Regex>
10030 =item B<MetaData> I<String> I<Regex>
10032 Match values where the given regular expressions match the various fields of
10033 the identifier of a value. If multiple regular expressions are given, B<all>
10034 regexen must match for a value to match.
10036 =item B<Invert> B<false>|B<true>
10038 When set to B<true>, the result of the match is inverted, i.e. all value lists
10039 where all regular expressions apply are not matched, all other value lists are
10040 matched. Defaults to B<false>.
10047 Host "customer[0-9]+"
10053 Matches values that have a time which differs from the time on the server.
10055 This match is mainly intended for servers that receive values over the
10056 C<network> plugin and write them to disk using the C<rrdtool> plugin. RRDtool
10057 is very sensitive to the timestamp used when updating the RRD files. In
10058 particular, the time must be ever increasing. If a misbehaving client sends one
10059 packet with a timestamp far in the future, all further packets with a correct
10060 time will be ignored because of that one packet. What's worse, such corrupted
10061 RRD files are hard to fix.
10063 This match lets one match all values B<outside> a specified time range
10064 (relative to the server's time), so you can use the B<stop> target (see below)
10065 to ignore the value, for example.
10071 =item B<Future> I<Seconds>
10073 Matches all values that are I<ahead> of the server's time by I<Seconds> or more
10074 seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
10077 =item B<Past> I<Seconds>
10079 Matches all values that are I<behind> of the server's time by I<Seconds> or
10080 more seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
10092 This example matches all values that are five minutes or more ahead of the
10093 server or one hour (or more) lagging behind.
10097 Matches the actual value of data sources against given minimumE<nbsp>/ maximum
10098 values. If a data-set consists of more than one data-source, all data-sources
10099 must match the specified ranges for a positive match.
10105 =item B<Min> I<Value>
10107 Sets the smallest value which still results in a match. If unset, behaves like
10110 =item B<Max> I<Value>
10112 Sets the largest value which still results in a match. If unset, behaves like
10115 =item B<Invert> B<true>|B<false>
10117 Inverts the selection. If the B<Min> and B<Max> settings result in a match,
10118 no-match is returned and vice versa. Please note that the B<Invert> setting
10119 only effects how B<Min> and B<Max> are applied to a specific value. Especially
10120 the B<DataSource> and B<Satisfy> settings (see below) are not inverted.
10122 =item B<DataSource> I<DSName> [I<DSName> ...]
10124 Select one or more of the data sources. If no data source is configured, all
10125 data sources will be checked. If the type handled by the match does not have a
10126 data source of the specified name(s), this will always result in no match
10127 (independent of the B<Invert> setting).
10129 =item B<Satisfy> B<Any>|B<All>
10131 Specifies how checking with several data sources is performed. If set to
10132 B<Any>, the match succeeds if one of the data sources is in the configured
10133 range. If set to B<All> the match only succeeds if all data sources are within
10134 the configured range. Default is B<All>.
10136 Usually B<All> is used for positive matches, B<Any> is used for negative
10137 matches. This means that with B<All> you usually check that all values are in a
10138 "good" range, while with B<Any> you check if any value is within a "bad" range
10139 (or outside the "good" range).
10143 Either B<Min> or B<Max>, but not both, may be unset.
10147 # Match all values smaller than or equal to 100. Matches only if all data
10148 # sources are below 100.
10154 # Match if the value of any data source is outside the range of 0 - 100.
10162 =item B<empty_counter>
10164 Matches all values with one or more data sources of type B<COUNTER> and where
10165 all counter values are zero. These counters usually I<never> increased since
10166 they started existing (and are therefore uninteresting), or got reset recently
10167 or overflowed and you had really, I<really> bad luck.
10169 Please keep in mind that ignoring such counters can result in confusing
10170 behavior: Counters which hardly ever increase will be zero for long periods of
10171 time. If the counter is reset for some reason (machine or service restarted,
10172 usually), the graph will be empty (NAN) for a long time. People may not
10177 Calculates a hash value of the host name and matches values according to that
10178 hash value. This makes it possible to divide all hosts into groups and match
10179 only values that are in a specific group. The intended use is in load
10180 balancing, where you want to handle only part of all data and leave the rest
10183 The hashing function used tries to distribute the hosts evenly. First, it
10184 calculates a 32E<nbsp>bit hash value using the characters of the hostname:
10187 for (i = 0; host[i] != 0; i++)
10188 hash_value = (hash_value * 251) + host[i];
10190 The constant 251 is a prime number which is supposed to make this hash value
10191 more random. The code then checks the group for this host according to the
10192 I<Total> and I<Match> arguments:
10194 if ((hash_value % Total) == Match)
10199 Please note that when you set I<Total> to two (i.E<nbsp>e. you have only two
10200 groups), then the least significant bit of the hash value will be the XOR of
10201 all least significant bits in the host name. One consequence is that when you
10202 have two hosts, "server0.example.com" and "server1.example.com", where the host
10203 name differs in one digit only and the digits differ by one, those hosts will
10204 never end up in the same group.
10210 =item B<Match> I<Match> I<Total>
10212 Divide the data into I<Total> groups and match all hosts in group I<Match> as
10213 described above. The groups are numbered from zero, i.E<nbsp>e. I<Match> must
10214 be smaller than I<Total>. I<Total> must be at least one, although only values
10215 greater than one really do make any sense.
10217 You can repeat this option to match multiple groups, for example:
10222 The above config will divide the data into seven groups and match groups three
10223 and five. One use would be to keep every value on two hosts so that if one
10224 fails the missing data can later be reconstructed from the second host.
10230 # Operate on the pre-cache chain, so that ignored values are not even in the
10235 # Divide all received hosts in seven groups and accept all hosts in
10239 # If matched: Return and continue.
10242 # If not matched: Return and stop.
10248 =head2 Available targets
10252 =item B<notification>
10254 Creates and dispatches a notification.
10260 =item B<Message> I<String>
10262 This required option sets the message of the notification. The following
10263 placeholders will be replaced by an appropriate value:
10271 =item B<%{plugin_instance}>
10275 =item B<%{type_instance}>
10277 These placeholders are replaced by the identifier field of the same name.
10279 =item B<%{ds:>I<name>B<}>
10281 These placeholders are replaced by a (hopefully) human readable representation
10282 of the current rate of this data source. If you changed the instance name
10283 (using the B<set> or B<replace> targets, see below), it may not be possible to
10284 convert counter values to rates.
10288 Please note that these placeholders are B<case sensitive>!
10290 =item B<Severity> B<"FAILURE">|B<"WARNING">|B<"OKAY">
10292 Sets the severity of the message. If omitted, the severity B<"WARNING"> is
10299 <Target "notification">
10300 Message "Oops, the %{type_instance} temperature is currently %{ds:value}!"
10306 Replaces parts of the identifier using regular expressions.
10312 =item B<Host> I<Regex> I<Replacement>
10314 =item B<Plugin> I<Regex> I<Replacement>
10316 =item B<PluginInstance> I<Regex> I<Replacement>
10318 =item B<TypeInstance> I<Regex> I<Replacement>
10320 =item B<MetaData> I<String> I<Regex> I<Replacement>
10322 =item B<DeleteMetaData> I<String> I<Regex>
10324 Match the appropriate field with the given regular expression I<Regex>. If the
10325 regular expression matches, that part that matches is replaced with
10326 I<Replacement>. If multiple places of the input buffer match a given regular
10327 expression, only the first occurrence will be replaced.
10329 You can specify each option multiple times to use multiple regular expressions
10337 # Replace "example.net" with "example.com"
10338 Host "\\<example.net\\>" "example.com"
10340 # Strip "www." from hostnames
10341 Host "\\<www\\." ""
10346 Sets part of the identifier of a value to a given string.
10352 =item B<Host> I<String>
10354 =item B<Plugin> I<String>
10356 =item B<PluginInstance> I<String>
10358 =item B<TypeInstance> I<String>
10360 =item B<MetaData> I<String> I<String>
10362 Set the appropriate field to the given string. The strings for plugin instance,
10363 type instance, and meta data may be empty, the strings for host and plugin may
10364 not be empty. It's currently not possible to set the type of a value this way.
10366 The following placeholders will be replaced by an appropriate value:
10374 =item B<%{plugin_instance}>
10378 =item B<%{type_instance}>
10380 These placeholders are replaced by the identifier field of the same name.
10382 =item B<%{meta:>I<name>B<}>
10384 These placeholders are replaced by the meta data value with the given name.
10388 Please note that these placeholders are B<case sensitive>!
10390 =item B<DeleteMetaData> I<String>
10392 Delete the named meta data field.
10399 PluginInstance "coretemp"
10400 TypeInstance "core3"
10405 =head2 Backwards compatibility
10407 If you use collectd with an old configuration, i.E<nbsp>e. one without a
10408 B<Chain> block, it will behave as it used to. This is equivalent to the
10409 following configuration:
10411 <Chain "PostCache">
10415 If you specify a B<PostCacheChain>, the B<write> target will not be added
10416 anywhere and you will have to make sure that it is called where appropriate. We
10417 suggest to add the above snippet as default target to your "PostCache" chain.
10421 Ignore all values, where the hostname does not contain a dot, i.E<nbsp>e. can't
10436 B<Ignorelists> are a generic framework to either ignore some metrics or report
10437 specific metircs only. Plugins usually provide one or more options to specify
10438 the items (mounts points, devices, ...) and the boolean option
10443 =item B<Select> I<String>
10445 Selects the item I<String>. This option often has a plugin specific name, e.g.
10446 B<Sensor> in the C<sensors> plugin. It is also plugin specific what this string
10447 is compared to. For example, the C<df> plugin's B<MountPoint> compares it to a
10448 mount point and the C<sensors> plugin's B<Sensor> compares it to a sensor name.
10450 By default, this option is doing a case-sensitive full-string match. The
10451 following config will match C<foo>, but not C<Foo>:
10455 If I<String> starts and ends with C</> (a slash), the string is compiled as a
10456 I<regular expression>. For example, so match all item starting with C<foo>, use
10457 could use the following syntax:
10461 The regular expression is I<not> anchored, i.e. the following config will match
10462 C<foobar>, C<barfoo> and C<AfooZ>:
10466 The B<Select> option may be repeated to select multiple items.
10468 =item B<IgnoreSelected> B<true>|B<false>
10470 If set to B<true>, matching metrics are I<ignored> and all other metrics are
10471 collected. If set to B<false>, matching metrics are I<collected> and all other
10472 metrics are ignored.
10479 L<collectd-exec(5)>,
10480 L<collectd-perl(5)>,
10481 L<collectd-unixsock(5)>,
10494 Florian Forster E<lt>octo@collectd.orgE<gt>