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">
2411 ProcessType "secondary"
2414 <Event "link_status">
2415 SendEventsOnUpdate true
2416 EnabledPortMask 0xffff
2417 PortName "interface1"
2418 PortName "interface2"
2419 SendNotification false
2421 <Event "keep_alive">
2422 SendEventsOnUpdate true
2424 KeepAliveShmName "/dpdk_keepalive_shm_name"
2425 SendNotification false
2432 =head3 The EAL block
2436 =item B<Coremask> I<Mask>
2438 =item B<Memorychannels> I<Channels>
2440 Number of memory channels per processor socket.
2442 =item B<ProcessType> I<type>
2444 The type of DPDK process instance.
2446 =item B<FilePrefix> I<File>
2448 The prefix text used for hugepage filenames. The filename will be set to
2449 /var/run/.<prefix>_config where prefix is what is passed in by the user.
2453 =head3 The Event block
2455 The B<Event> block defines configuration for specific event. It accepts a
2456 single argument which specifies the name of the event.
2458 =head4 Link Status event
2462 =item B<SendEventOnUpdate> I<true|false>
2464 If set to true link status value will be dispatched only when it is
2465 different from previously read value. This is an optional argument - default
2468 =item B<EnabledPortMask> I<Mask>
2470 A hexidecimal bit mask of the DPDK ports which should be enabled. A mask
2471 of 0x0 means that all ports will be disabled. A bitmask of all F's means
2472 that all ports will be enabled. This is an optional argument - by default
2473 all ports are enabled.
2475 =item B<PortName> I<Name>
2477 A string containing an optional name for the enabled DPDK ports. Each PortName
2478 option should contain only one port name; specify as many PortName options as
2479 desired. Default naming convention will be used if PortName is blank. If there
2480 are less PortName options than there are enabled ports, the default naming
2481 convention will be used for the additional ports.
2483 =item B<SendNotification> I<true|false>
2485 If set to true, link status notifications are sent, instead of link status
2486 being collected as a statistic. This is an optional argument - default
2491 =head4 Keep Alive event
2495 =item B<SendEventOnUpdate> I<true|false>
2497 If set to true keep alive value will be dispatched only when it is
2498 different from previously read value. This is an optional argument - default
2501 =item B<LCoreMask> I<Mask>
2503 An hexadecimal bit mask of the logical cores to monitor keep alive state.
2505 =item B<KeepAliveShmName> I<Name>
2507 Shared memory name identifier that is used by secondary process to monitor
2508 the keep alive cores state.
2510 =item B<SendNotification> I<true|false>
2512 If set to true, keep alive notifications are sent, instead of keep alive
2513 information being collected as a statistic. This is an optional
2514 argument - default value is false.
2518 =head2 Plugin C<dpdkstat>
2520 The I<dpdkstat plugin> collects information about DPDK interfaces using the
2521 extended NIC stats API in DPDK.
2529 ProcessType "secondary"
2533 SharedMemObj "dpdk_collectd_stats_0"
2534 EnabledPortMask 0xffff
2535 PortName "interface1"
2536 PortName "interface2"
2541 =head3 The EAL block
2545 =item B<Coremask> I<Mask>
2547 A string containing an hexadecimal bit mask of the cores to run on. Note that
2548 core numbering can change between platforms and should be determined beforehand.
2550 =item B<Memorychannels> I<Channels>
2552 A string containing a number of memory channels per processor socket.
2554 =item B<ProcessType> I<type>
2556 A string containing the type of DPDK process instance.
2558 =item B<FilePrefix> I<File>
2560 The prefix text used for hugepage filenames. The filename will be set to
2561 /var/run/.<prefix>_config where prefix is what is passed in by the user.
2563 =item B<SocketMemory> I<MB>
2565 A string containing amount of Memory to allocate from hugepages on specific
2566 sockets in MB. This is an optional value.
2572 =item B<SharedMemObj> I<Mask>
2573 A string containing the name of the shared memory object that should be used to
2574 share stats from the DPDK secondary process to the collectd dpdkstat plugin.
2575 Defaults to dpdk_collectd_stats if no other value is configured.
2577 =item B<EnabledPortMask> I<Mask>
2579 A hexidecimal bit mask of the DPDK ports which should be enabled. A mask
2580 of 0x0 means that all ports will be disabled. A bitmask of all Fs means
2581 that all ports will be enabled. This is an optional argument - default
2582 is all ports enabled.
2584 =item B<PortName> I<Name>
2586 A string containing an optional name for the enabled DPDK ports. Each PortName
2587 option should contain only one port name; specify as many PortName options as
2588 desired. Default naming convention will be used if PortName is blank. If there
2589 are less PortName options than there are enabled ports, the default naming
2590 convention will be used for the additional ports.
2594 =head2 Plugin C<email>
2598 =item B<SocketFile> I<Path>
2600 Sets the socket-file which is to be created.
2602 =item B<SocketGroup> I<Group>
2604 If running as root change the group of the UNIX-socket after it has been
2605 created. Defaults to B<collectd>.
2607 =item B<SocketPerms> I<Permissions>
2609 Change the file permissions of the UNIX-socket after it has been created. The
2610 permissions must be given as a numeric, octal value as you would pass to
2611 L<chmod(1)>. Defaults to B<0770>.
2613 =item B<MaxConns> I<Number>
2615 Sets the maximum number of connections that can be handled in parallel. Since
2616 this many threads will be started immediately setting this to a very high
2617 value will waste valuable resources. Defaults to B<5> and will be forced to be
2618 at most B<16384> to prevent typos and dumb mistakes.
2622 =head2 Plugin C<ethstat>
2624 The I<ethstat plugin> collects information about network interface cards (NICs)
2625 by talking directly with the underlying kernel driver using L<ioctl(2)>.
2631 Map "rx_csum_offload_errors" "if_rx_errors" "checksum_offload"
2632 Map "multicast" "if_multicast"
2639 =item B<Interface> I<Name>
2641 Collect statistical information about interface I<Name>.
2643 =item B<Map> I<Name> I<Type> [I<TypeInstance>]
2645 By default, the plugin will submit values as type C<derive> and I<type
2646 instance> set to I<Name>, the name of the metric as reported by the driver. If
2647 an appropriate B<Map> option exists, the given I<Type> and, optionally,
2648 I<TypeInstance> will be used.
2650 =item B<MappedOnly> B<true>|B<false>
2652 When set to B<true>, only metrics that can be mapped to a I<type> will be
2653 collected, all other metrics will be ignored. Defaults to B<false>.
2657 =head2 Plugin C<exec>
2659 Please make sure to read L<collectd-exec(5)> before using this plugin. It
2660 contains valuable information on when the executable is executed and the
2661 output that is expected from it.
2665 =item B<Exec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2667 =item B<NotificationExec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2669 Execute the executable I<Executable> as user I<User>. If the user name is
2670 followed by a colon and a group name, the effective group is set to that group.
2671 The real group and saved-set group will be set to the default group of that
2672 user. If no group is given the effective group ID will be the same as the real
2675 Please note that in order to change the user and/or group the daemon needs
2676 superuser privileges. If the daemon is run as an unprivileged user you must
2677 specify the same user/group here. If the daemon is run with superuser
2678 privileges, you must supply a non-root user here.
2680 The executable may be followed by optional arguments that are passed to the
2681 program. Please note that due to the configuration parsing numbers and boolean
2682 values may be changed. If you want to be absolutely sure that something is
2683 passed as-is please enclose it in quotes.
2685 The B<Exec> and B<NotificationExec> statements change the semantics of the
2686 programs executed, i.E<nbsp>e. the data passed to them and the response
2687 expected from them. This is documented in great detail in L<collectd-exec(5)>.
2691 =head2 Plugin C<fhcount>
2693 The C<fhcount> plugin provides statistics about used, unused and total number of
2694 file handles on Linux.
2696 The I<fhcount plugin> provides the following configuration options:
2700 =item B<ValuesAbsolute> B<true>|B<false>
2702 Enables or disables reporting of file handles usage in absolute numbers,
2703 e.g. file handles used. Defaults to B<true>.
2705 =item B<ValuesPercentage> B<false>|B<true>
2707 Enables or disables reporting of file handles usage in percentages, e.g.
2708 percent of file handles used. Defaults to B<false>.
2712 =head2 Plugin C<filecount>
2714 The C<filecount> plugin counts the number of files in a certain directory (and
2715 its subdirectories) and their combined size. The configuration is very straight
2718 <Plugin "filecount">
2719 <Directory "/var/qmail/queue/mess">
2720 Instance "qmail-message"
2722 <Directory "/var/qmail/queue/todo">
2723 Instance "qmail-todo"
2725 <Directory "/var/lib/php5">
2726 Instance "php5-sessions"
2731 The example above counts the number of files in QMail's queue directories and
2732 the number of PHP5 sessions. Jfiy: The "todo" queue holds the messages that
2733 QMail has not yet looked at, the "message" queue holds the messages that were
2734 classified into "local" and "remote".
2736 As you can see, the configuration consists of one or more C<Directory> blocks,
2737 each of which specifies a directory in which to count the files. Within those
2738 blocks, the following options are recognized:
2742 =item B<Instance> I<Instance>
2744 Sets the plugin instance to I<Instance>. That instance name must be unique, but
2745 it's your responsibility, the plugin doesn't check for that. If not given, the
2746 instance is set to the directory name with all slashes replaced by underscores
2747 and all leading underscores removed.
2749 =item B<Name> I<Pattern>
2751 Only count files that match I<Pattern>, where I<Pattern> is a shell-like
2752 wildcard as understood by L<fnmatch(3)>. Only the B<filename> is checked
2753 against the pattern, not the entire path. In case this makes it easier for you:
2754 This option has been named after the B<-name> parameter to L<find(1)>.
2756 =item B<MTime> I<Age>
2758 Count only files of a specific age: If I<Age> is greater than zero, only files
2759 that haven't been touched in the last I<Age> seconds are counted. If I<Age> is
2760 a negative number, this is inversed. For example, if B<-60> is specified, only
2761 files that have been modified in the last minute will be counted.
2763 The number can also be followed by a "multiplier" to easily specify a larger
2764 timespan. When given in this notation, the argument must in quoted, i.E<nbsp>e.
2765 must be passed as string. So the B<-60> could also be written as B<"-1m"> (one
2766 minute). Valid multipliers are C<s> (second), C<m> (minute), C<h> (hour), C<d>
2767 (day), C<w> (week), and C<y> (year). There is no "month" multiplier. You can
2768 also specify fractional numbers, e.E<nbsp>g. B<"0.5d"> is identical to
2771 =item B<Size> I<Size>
2773 Count only files of a specific size. When I<Size> is a positive number, only
2774 files that are at least this big are counted. If I<Size> is a negative number,
2775 this is inversed, i.E<nbsp>e. only files smaller than the absolute value of
2776 I<Size> are counted.
2778 As with the B<MTime> option, a "multiplier" may be added. For a detailed
2779 description see above. Valid multipliers here are C<b> (byte), C<k> (kilobyte),
2780 C<m> (megabyte), C<g> (gigabyte), C<t> (terabyte), and C<p> (petabyte). Please
2781 note that there are 1000 bytes in a kilobyte, not 1024.
2783 =item B<Recursive> I<true>|I<false>
2785 Controls whether or not to recurse into subdirectories. Enabled by default.
2787 =item B<IncludeHidden> I<true>|I<false>
2789 Controls whether or not to include "hidden" files and directories in the count.
2790 "Hidden" files and directories are those, whose name begins with a dot.
2791 Defaults to I<false>, i.e. by default hidden files and directories are ignored.
2795 =head2 Plugin C<GenericJMX>
2797 The I<GenericJMX plugin> is written in I<Java> and therefore documented in
2798 L<collectd-java(5)>.
2800 =head2 Plugin C<gmond>
2802 The I<gmond> plugin received the multicast traffic sent by B<gmond>, the
2803 statistics collection daemon of Ganglia. Mappings for the standard "metrics"
2804 are built-in, custom mappings may be added via B<Metric> blocks, see below.
2809 MCReceiveFrom "239.2.11.71" "8649"
2810 <Metric "swap_total">
2812 TypeInstance "total"
2815 <Metric "swap_free">
2822 The following metrics are built-in:
2828 load_one, load_five, load_fifteen
2832 cpu_user, cpu_system, cpu_idle, cpu_nice, cpu_wio
2836 mem_free, mem_shared, mem_buffers, mem_cached, mem_total
2848 Available configuration options:
2852 =item B<MCReceiveFrom> I<MCGroup> [I<Port>]
2854 Sets sets the multicast group and UDP port to which to subscribe.
2856 Default: B<239.2.11.71>E<nbsp>/E<nbsp>B<8649>
2858 =item E<lt>B<Metric> I<Name>E<gt>
2860 These blocks add a new metric conversion to the internal table. I<Name>, the
2861 string argument to the B<Metric> block, is the metric name as used by Ganglia.
2865 =item B<Type> I<Type>
2867 Type to map this metric to. Required.
2869 =item B<TypeInstance> I<Instance>
2871 Type-instance to use. Optional.
2873 =item B<DataSource> I<Name>
2875 Data source to map this metric to. If the configured type has exactly one data
2876 source, this is optional. Otherwise the option is required.
2882 =head2 Plugin C<gps>
2884 The C<gps plugin> connects to gpsd on the host machine.
2885 The host, port, timeout and pause are configurable.
2887 This is useful if you run an NTP server using a GPS for source and you want to
2890 Mind your GPS must send $--GSA for having the data reported!
2892 The following elements are collected:
2898 Number of satellites used for fix (type instance "used") and in view (type
2899 instance "visible"). 0 means no GPS satellites are visible.
2901 =item B<dilution_of_precision>
2903 Vertical and horizontal dilution (type instance "horizontal" or "vertical").
2904 It should be between 0 and 3.
2905 Look at the documentation of your GPS to know more.
2913 # Connect to localhost on gpsd regular port:
2918 # PauseConnect of 5 sec. between connection attempts.
2922 Available configuration options:
2926 =item B<Host> I<Host>
2928 The host on which gpsd daemon runs. Defaults to B<localhost>.
2930 =item B<Port> I<Port>
2932 Port to connect to gpsd on the host machine. Defaults to B<2947>.
2934 =item B<Timeout> I<Seconds>
2936 Timeout in seconds (default 0.015 sec).
2938 The GPS data stream is fetch by the plugin form the daemon.
2939 It waits for data to be available, if none arrives it times out
2940 and loop for another reading.
2941 Mind to put a low value gpsd expects value in the micro-seconds area
2942 (recommended is 500 us) since the waiting function is blocking.
2943 Value must be between 500 us and 5 sec., if outside that range the
2944 default value is applied.
2946 This only applies from gpsd release-2.95.
2948 =item B<PauseConnect> I<Seconds>
2950 Pause to apply between attempts of connection to gpsd in seconds (default 5 sec).
2954 =head2 Plugin C<grpc>
2956 The I<grpc> plugin provides an RPC interface to submit values to or query
2957 values from collectd based on the open source gRPC framework. It exposes an
2958 end-point for dispatching values to the daemon.
2960 The B<gRPC> homepage can be found at L<https://grpc.io/>.
2964 =item B<Server> I<Host> I<Port>
2966 The B<Server> statement sets the address of a server to which to send metrics
2967 via the C<DispatchValues> function.
2969 The argument I<Host> may be a hostname, an IPv4 address, or an IPv6 address.
2971 Optionally, B<Server> may be specified as a configuration block which supports
2972 the following options:
2976 =item B<EnableSSL> B<false>|B<true>
2978 Whether to require SSL for outgoing connections. Default: false.
2980 =item B<SSLCACertificateFile> I<Filename>
2982 =item B<SSLCertificateFile> I<Filename>
2984 =item B<SSLCertificateKeyFile> I<Filename>
2986 Filenames specifying SSL certificate and key material to be used with SSL
2991 =item B<Listen> I<Host> I<Port>
2993 The B<Listen> statement sets the network address to bind to. When multiple
2994 statements are specified, the daemon will bind to all of them. If none are
2995 specified, it defaults to B<0.0.0.0:50051>.
2997 The argument I<Host> may be a hostname, an IPv4 address, or an IPv6 address.
2999 Optionally, B<Listen> may be specified as a configuration block which
3000 supports the following options:
3004 =item B<EnableSSL> I<true>|I<false>
3006 Whether to enable SSL for incoming connections. Default: false.
3008 =item B<SSLCACertificateFile> I<Filename>
3010 =item B<SSLCertificateFile> I<Filename>
3012 =item B<SSLCertificateKeyFile> I<Filename>
3014 Filenames specifying SSL certificate and key material to be used with SSL
3021 =head2 Plugin C<hddtemp>
3023 To get values from B<hddtemp> collectd connects to B<localhost> (127.0.0.1),
3024 port B<7634/tcp>. The B<Host> and B<Port> options can be used to change these
3025 default values, see below. C<hddtemp> has to be running to work correctly. If
3026 C<hddtemp> is not running timeouts may appear which may interfere with other
3029 The B<hddtemp> homepage can be found at
3030 L<http://www.guzu.net/linux/hddtemp.php>.
3034 =item B<Host> I<Hostname>
3036 Hostname to connect to. Defaults to B<127.0.0.1>.
3038 =item B<Port> I<Port>
3040 TCP-Port to connect to. Defaults to B<7634>.
3044 =head2 Plugin C<hugepages>
3046 To collect B<hugepages> information, collectd reads directories
3047 "/sys/devices/system/node/*/hugepages" and
3048 "/sys/kernel/mm/hugepages".
3049 Reading of these directories can be disabled by the following
3050 options (default is enabled).
3054 =item B<ReportPerNodeHP> B<true>|B<false>
3056 If enabled, information will be collected from the hugepage
3057 counters in "/sys/devices/system/node/*/hugepages".
3058 This is used to check the per-node hugepage statistics on
3061 =item B<ReportRootHP> B<true>|B<false>
3063 If enabled, information will be collected from the hugepage
3064 counters in "/sys/kernel/mm/hugepages".
3065 This can be used on both NUMA and non-NUMA systems to check
3066 the overall hugepage statistics.
3068 =item B<ValuesPages> B<true>|B<false>
3070 Whether to report hugepages metrics in number of pages.
3071 Defaults to B<true>.
3073 =item B<ValuesBytes> B<false>|B<true>
3075 Whether to report hugepages metrics in bytes.
3076 Defaults to B<false>.
3078 =item B<ValuesPercentage> B<false>|B<true>
3080 Whether to report hugepages metrics as percentage.
3081 Defaults to B<false>.
3085 =head2 Plugin C<intel_pmu>
3087 The I<intel_pmu> plugin collects performance counters data on Intel CPUs using
3088 Linux perf interface. All events are reported on a per core basis.
3094 KernelPMUEvents true
3096 HWSpecificEvents "L2_RQSTS.CODE_RD_HIT,L2_RQSTS.CODE_RD_MISS"
3103 =item B<HWCacheEvents> B<false>|B<true>
3105 Enable or disable measuring of hardware CPU cache events:
3107 - L1-dcache-load-misses
3109 - L1-dcache-store-misses
3110 - L1-dcache-prefetches
3111 - L1-dcache-prefetch-misses
3113 - L1-icache-load-misses
3114 - L1-icache-prefetches
3115 - L1-icache-prefetch-misses
3121 - LLC-prefetch-misses
3127 - dTLB-prefetch-misses
3131 - branch-load-misses
3133 =item B<KernelPMUEvents> B<false>|B<true>
3135 Enable or disable measuring of the following events:
3144 =item B<SWEvents> B<false>|B<true>
3146 Enable or disable measuring of software events provided by kernel:
3157 =item B<HWSpecificEvents> I<events>
3159 This field is a list of comma separated event names. To be able to monitor all
3160 Intel CPU specific events JSON event list file should be downloaded.
3161 Use the pmu-tools event_download.py script for this.
3165 =head2 Plugin C<intel_rdt>
3167 The I<intel_rdt> plugin collects information provided by monitoring features of
3168 Intel Resource Director Technology (Intel(R) RDT) like Cache Monitoring
3169 Technology (CMT), Memory Bandwidth Monitoring (MBM). These features provide
3170 information about utilization of shared resources. CMT monitors last level cache
3171 occupancy (LLC). MBM supports two types of events reporting local and remote
3172 memory bandwidth. Local memory bandwidth (MBL) reports the bandwidth of
3173 accessing memory associated with the local socket. Remote memory bandwidth (MBR)
3174 reports the bandwidth of accessing the remote socket. Also this technology
3175 allows to monitor instructions per clock (IPC).
3176 Monitor events are hardware dependant. Monitoring capabilities are detected on
3177 plugin initialization and only supported events are monitored.
3179 B<Note:> I<intel_rdt> plugin is using model-specific registers (MSRs), which
3180 require an additional capability to be enabled if collectd is run as a service.
3181 Please refer to I<contrib/systemd.collectd.service> file for more details.
3185 <Plugin "intel_rdt">
3186 Cores "0-2" "3,4,6" "8-10,15"
3193 =item B<Interval> I<seconds>
3195 The interval within which to retrieve statistics on monitored events in seconds.
3196 For milliseconds divide the time by 1000 for example if the desired interval
3197 is 50ms, set interval to 0.05. Due to limited capacity of counters it is not
3198 recommended to set interval higher than 1 sec.
3200 =item B<Cores> I<cores groups>
3202 All events are reported on a per core basis. Monitoring of the events can be
3203 configured for group of cores (aggregated statistics). This field defines groups
3204 of cores on which to monitor supported events. The field is represented as list
3205 of strings with core group values. Each string represents a list of cores in a
3206 group. Allowed formats are:
3211 If an empty string is provided as value for this field default cores
3212 configuration is applied - a separate group is created for each core.
3216 B<Note:> By default global interval is used to retrieve statistics on monitored
3217 events. To configure a plugin specific interval use B<Interval> option of the
3218 intel_rdt <LoadPlugin> block. For milliseconds divide the time by 1000 for
3219 example if the desired interval is 50ms, set interval to 0.05.
3220 Due to limited capacity of counters it is not recommended to set interval higher
3223 =head2 Plugin C<interface>
3227 =item B<Interface> I<Interface>
3229 Select this interface. By default these interfaces will then be collected. For
3230 a more detailed description see B<IgnoreSelected> below.
3232 See F</"IGNORELISTS"> for details.
3234 =item B<IgnoreSelected> I<true>|I<false>
3236 If no configuration if given, the B<interface>-plugin will collect data from
3237 all interfaces. This may not be practical, especially for loopback- and
3238 similar interfaces. Thus, you can use the B<Interface>-option to pick the
3239 interfaces you're interested in. Sometimes, however, it's easier/preferred
3240 to collect all interfaces I<except> a few ones. This option enables you to
3241 do that: By setting B<IgnoreSelected> to I<true> the effect of
3242 B<Interface> is inverted: All selected interfaces are ignored and all
3243 other interfaces are collected.
3245 It is possible to use regular expressions to match interface names, if the
3246 name is surrounded by I</.../> and collectd was compiled with support for
3247 regexps. This is useful if there's a need to collect (or ignore) data
3248 for a group of interfaces that are similarly named, without the need to
3249 explicitly list all of them (especially useful if the list is dynamic).
3254 Interface "/^tun[0-9]+/"
3255 IgnoreSelected "true"
3257 This will ignore the loopback interface, all interfaces with names starting
3258 with I<veth> and all interfaces with names starting with I<tun> followed by
3261 =item B<ReportInactive> I<true>|I<false>
3263 When set to I<false>, only interfaces with non-zero traffic will be
3264 reported. Note that the check is done by looking into whether a
3265 package was sent at any time from boot and the corresponding counter
3266 is non-zero. So, if the interface has been sending data in the past
3267 since boot, but not during the reported time-interval, it will still
3270 The default value is I<true> and results in collection of the data
3271 from all interfaces that are selected by B<Interface> and
3272 B<IgnoreSelected> options.
3274 =item B<UniqueName> I<true>|I<false>
3276 Interface name is not unique on Solaris (KSTAT), interface name is unique
3277 only within a module/instance. Following tuple is considered unique:
3278 (ks_module, ks_instance, ks_name)
3279 If this option is set to true, interface name contains above three fields
3280 separated by an underscore. For more info on KSTAT, visit
3281 L<http://docs.oracle.com/cd/E23824_01/html/821-1468/kstat-3kstat.html#REFMAN3Ekstat-3kstat>
3283 This option is only available on Solaris.
3287 =head2 Plugin C<ipmi>
3291 =item B<Sensor> I<Sensor>
3293 Selects sensors to collect or to ignore, depending on B<IgnoreSelected>.
3295 See F</"IGNORELISTS"> for details.
3297 =item B<IgnoreSelected> I<true>|I<false>
3299 If no configuration if given, the B<ipmi> plugin will collect data from all
3300 sensors found of type "temperature", "voltage", "current" and "fanspeed".
3301 This option enables you to do that: By setting B<IgnoreSelected> to I<true>
3302 the effect of B<Sensor> is inverted: All selected sensors are ignored and
3303 all other sensors are collected.
3305 =item B<NotifySensorAdd> I<true>|I<false>
3307 If a sensor appears after initialization time of a minute a notification
3310 =item B<NotifySensorRemove> I<true>|I<false>
3312 If a sensor disappears a notification is sent.
3314 =item B<NotifySensorNotPresent> I<true>|I<false>
3316 If you have for example dual power supply and one of them is (un)plugged then
3317 a notification is sent.
3321 =head2 Plugin C<iptables>
3325 =item B<Chain> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
3327 =item B<Chain6> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
3329 Select the iptables/ip6tables filter rules to count packets and bytes from.
3331 If only I<Table> and I<Chain> are given, this plugin will collect the counters
3332 of all rules which have a comment-match. The comment is then used as
3335 If I<Comment> or I<Number> is given, only the rule with the matching comment or
3336 the I<n>th rule will be collected. Again, the comment (or the number) will be
3337 used as the type-instance.
3339 If I<Name> is supplied, it will be used as the type-instance instead of the
3340 comment or the number.
3344 =head2 Plugin C<irq>
3350 Select this irq. By default these irqs will then be collected. For a more
3351 detailed description see B<IgnoreSelected> below.
3353 See F</"IGNORELISTS"> for details.
3355 =item B<IgnoreSelected> I<true>|I<false>
3357 If no configuration if given, the B<irq>-plugin will collect data from all
3358 irqs. This may not be practical, especially if no interrupts happen. Thus, you
3359 can use the B<Irq>-option to pick the interrupt you're interested in.
3360 Sometimes, however, it's easier/preferred to collect all interrupts I<except> a
3361 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
3362 I<true> the effect of B<Irq> is inverted: All selected interrupts are ignored
3363 and all other interrupts are collected.
3367 =head2 Plugin C<java>
3369 The I<Java> plugin makes it possible to write extensions for collectd in Java.
3370 This section only discusses the syntax and semantic of the configuration
3371 options. For more in-depth information on the I<Java> plugin, please read
3372 L<collectd-java(5)>.
3377 JVMArg "-verbose:jni"
3378 JVMArg "-Djava.class.path=/opt/collectd/lib/collectd/bindings/java"
3379 LoadPlugin "org.collectd.java.Foobar"
3380 <Plugin "org.collectd.java.Foobar">
3381 # To be parsed by the plugin
3385 Available configuration options:
3389 =item B<JVMArg> I<Argument>
3391 Argument that is to be passed to the I<Java Virtual Machine> (JVM). This works
3392 exactly the way the arguments to the I<java> binary on the command line work.
3393 Execute C<javaE<nbsp>--help> for details.
3395 Please note that B<all> these options must appear B<before> (i.E<nbsp>e. above)
3396 any other options! When another option is found, the JVM will be started and
3397 later options will have to be ignored!
3399 =item B<LoadPlugin> I<JavaClass>
3401 Instantiates a new I<JavaClass> object. The constructor of this object very
3402 likely then registers one or more callback methods with the server.
3404 See L<collectd-java(5)> for details.
3406 When the first such option is found, the virtual machine (JVM) is created. This
3407 means that all B<JVMArg> options must appear before (i.E<nbsp>e. above) all
3408 B<LoadPlugin> options!
3410 =item B<Plugin> I<Name>
3412 The entire block is passed to the Java plugin as an
3413 I<org.collectd.api.OConfigItem> object.
3415 For this to work, the plugin has to register a configuration callback first,
3416 see L<collectd-java(5)/"config callback">. This means, that the B<Plugin> block
3417 must appear after the appropriate B<LoadPlugin> block. Also note, that I<Name>
3418 depends on the (Java) plugin registering the callback and is completely
3419 independent from the I<JavaClass> argument passed to B<LoadPlugin>.
3423 =head2 Plugin C<load>
3425 The I<Load plugin> collects the system load. These numbers give a rough overview
3426 over the utilization of a machine. The system load is defined as the number of
3427 runnable tasks in the run-queue and is provided by many operating systems as a
3428 one, five or fifteen minute average.
3430 The following configuration options are available:
3434 =item B<ReportRelative> B<false>|B<true>
3436 When enabled, system load divided by number of available CPU cores is reported
3437 for intervals 1 min, 5 min and 15 min. Defaults to false.
3442 =head2 Plugin C<logfile>
3446 =item B<LogLevel> B<debug|info|notice|warning|err>
3448 Sets the log-level. If, for example, set to B<notice>, then all events with
3449 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
3451 Please note that B<debug> is only available if collectd has been compiled with
3454 =item B<File> I<File>
3456 Sets the file to write log messages to. The special strings B<stdout> and
3457 B<stderr> can be used to write to the standard output and standard error
3458 channels, respectively. This, of course, only makes much sense when I<collectd>
3459 is running in foreground- or non-daemon-mode.
3461 =item B<Timestamp> B<true>|B<false>
3463 Prefix all lines printed by the current time. Defaults to B<true>.
3465 =item B<PrintSeverity> B<true>|B<false>
3467 When enabled, all lines are prefixed by the severity of the log message, for
3468 example "warning". Defaults to B<false>.
3472 B<Note>: There is no need to notify the daemon after moving or removing the
3473 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
3474 for each line it writes.
3476 =head2 Plugin C<log_logstash>
3478 The I<log logstash plugin> behaves like the logfile plugin but formats
3479 messages as JSON events for logstash to parse and input.
3483 =item B<LogLevel> B<debug|info|notice|warning|err>
3485 Sets the log-level. If, for example, set to B<notice>, then all events with
3486 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
3488 Please note that B<debug> is only available if collectd has been compiled with
3491 =item B<File> I<File>
3493 Sets the file to write log messages to. The special strings B<stdout> and
3494 B<stderr> can be used to write to the standard output and standard error
3495 channels, respectively. This, of course, only makes much sense when I<collectd>
3496 is running in foreground- or non-daemon-mode.
3500 B<Note>: There is no need to notify the daemon after moving or removing the
3501 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
3502 for each line it writes.
3504 =head2 Plugin C<lpar>
3506 The I<LPAR plugin> reads CPU statistics of I<Logical Partitions>, a
3507 virtualization technique for IBM POWER processors. It takes into account CPU
3508 time stolen from or donated to a partition, in addition to the usual user,
3509 system, I/O statistics.
3511 The following configuration options are available:
3515 =item B<CpuPoolStats> B<false>|B<true>
3517 When enabled, statistics about the processor pool are read, too. The partition
3518 needs to have pool authority in order to be able to acquire this information.
3521 =item B<ReportBySerial> B<false>|B<true>
3523 If enabled, the serial of the physical machine the partition is currently
3524 running on is reported as I<hostname> and the logical hostname of the machine
3525 is reported in the I<plugin instance>. Otherwise, the logical hostname will be
3526 used (just like other plugins) and the I<plugin instance> will be empty.
3531 =head2 Plugin C<lua>
3533 This plugin embeds a Lua interpreter into collectd and provides an interface
3534 to collectd's plugin system. See L<collectd-lua(5)> for its documentation.
3537 =head2 Plugin C<mbmon>
3539 The C<mbmon plugin> uses mbmon to retrieve temperature, voltage, etc.
3541 Be default collectd connects to B<localhost> (127.0.0.1), port B<411/tcp>. The
3542 B<Host> and B<Port> options can be used to change these values, see below.
3543 C<mbmon> has to be running to work correctly. If C<mbmon> is not running
3544 timeouts may appear which may interfere with other statistics..
3546 C<mbmon> must be run with the -r option ("print TAG and Value format");
3547 Debian's F</etc/init.d/mbmon> script already does this, other people
3548 will need to ensure that this is the case.
3552 =item B<Host> I<Hostname>
3554 Hostname to connect to. Defaults to B<127.0.0.1>.
3556 =item B<Port> I<Port>
3558 TCP-Port to connect to. Defaults to B<411>.
3562 =head2 Plugin C<mcelog>
3564 The C<mcelog plugin> uses mcelog to retrieve machine check exceptions.
3566 By default the plugin connects to B<"/var/run/mcelog-client"> to check if the
3567 mcelog server is running. When the server is running, the plugin will tail the
3568 specified logfile to retrieve machine check exception information and send a
3569 notification with the details from the logfile. The plugin will use the mcelog
3570 client protocol to retrieve memory related machine check exceptions.
3574 =item B<McelogClientSocket> I<Path>
3575 Connect to the mcelog client socket using the UNIX domain socket at I<Path>.
3576 Defaults to B<"/var/run/mcelog-client">.
3578 =item B<McelogLogfile> I<Path>
3580 The mcelog file to parse. Defaults to B<"/var/log/mcelog">.
3586 The C<md plugin> collects information from Linux Software-RAID devices (md).
3588 All reported values are of the type C<md_disks>. Reported type instances are
3589 I<active>, I<failed> (present but not operational), I<spare> (hot stand-by) and
3590 I<missing> (physically absent) disks.
3594 =item B<Device> I<Device>
3596 Select md devices based on device name. The I<device name> is the basename of
3597 the device, i.e. the name of the block device without the leading C</dev/>.
3598 See B<IgnoreSelected> for more details.
3600 See F</"IGNORELISTS"> for details.
3602 =item B<IgnoreSelected> B<true>|B<false>
3604 Invert device selection: If set to B<true>, all md devices B<except> those
3605 listed using B<Device> are collected. If B<false> (the default), only those
3606 listed are collected. If no configuration is given, the B<md> plugin will
3607 collect data from all md devices.
3611 =head2 Plugin C<memcachec>
3613 The C<memcachec plugin> connects to a memcached server, queries one or more
3614 given I<pages> and parses the returned data according to user specification.
3615 The I<matches> used are the same as the matches used in the C<curl> and C<tail>
3618 In order to talk to the memcached server, this plugin uses the I<libmemcached>
3619 library. Please note that there is another library with a very similar name,
3620 libmemcache (notice the missing `d'), which is not applicable.
3622 Synopsis of the configuration:
3624 <Plugin "memcachec">
3625 <Page "plugin_instance">
3629 Regex "(\\d+) bytes sent"
3632 Instance "type_instance"
3637 The configuration options are:
3641 =item E<lt>B<Page> I<Name>E<gt>
3643 Each B<Page> block defines one I<page> to be queried from the memcached server.
3644 The block requires one string argument which is used as I<plugin instance>.
3646 =item B<Server> I<Address>
3648 Sets the server address to connect to when querying the page. Must be inside a
3653 When connected to the memcached server, asks for the page I<Key>.
3655 =item E<lt>B<Match>E<gt>
3657 Match blocks define which strings to look for and how matches substrings are
3658 interpreted. For a description of match blocks, please see L<"Plugin tail">.
3662 =head2 Plugin C<memcached>
3664 The B<memcached plugin> connects to a memcached server and queries statistics
3665 about cache utilization, memory and bandwidth used.
3666 L<http://memcached.org/>
3668 <Plugin "memcached">
3670 #Host "memcache.example.com"
3676 The plugin configuration consists of one or more B<Instance> blocks which
3677 specify one I<memcached> connection each. Within the B<Instance> blocks, the
3678 following options are allowed:
3682 =item B<Host> I<Hostname>
3684 Sets the B<host> field of dispatched values. Defaults to the global hostname
3686 For backwards compatibility, values are also dispatched with the global
3687 hostname when B<Host> is set to B<127.0.0.1> or B<localhost> and B<Address> is
3690 =item B<Address> I<Address>
3692 Hostname or IP to connect to. For backwards compatibility, defaults to the
3693 value of B<Host> or B<127.0.0.1> if B<Host> is unset.
3695 =item B<Port> I<Port>
3697 TCP port to connect to. Defaults to B<11211>.
3699 =item B<Socket> I<Path>
3701 Connect to I<memcached> using the UNIX domain socket at I<Path>. If this
3702 setting is given, the B<Address> and B<Port> settings are ignored.
3706 =head2 Plugin C<mic>
3708 The B<mic plugin> gathers CPU statistics, memory usage and temperatures from
3709 Intel's Many Integrated Core (MIC) systems.
3718 ShowTemperatures true
3721 IgnoreSelectedTemperature true
3726 IgnoreSelectedPower true
3729 The following options are valid inside the B<PluginE<nbsp>mic> block:
3733 =item B<ShowCPU> B<true>|B<false>
3735 If enabled (the default) a sum of the CPU usage across all cores is reported.
3737 =item B<ShowCPUCores> B<true>|B<false>
3739 If enabled (the default) per-core CPU usage is reported.
3741 =item B<ShowMemory> B<true>|B<false>
3743 If enabled (the default) the physical memory usage of the MIC system is
3746 =item B<ShowTemperatures> B<true>|B<false>
3748 If enabled (the default) various temperatures of the MIC system are reported.
3750 =item B<Temperature> I<Name>
3752 This option controls which temperatures are being reported. Whether matching
3753 temperatures are being ignored or I<only> matching temperatures are reported
3754 depends on the B<IgnoreSelectedTemperature> setting below. By default I<all>
3755 temperatures are reported.
3757 =item B<IgnoreSelectedTemperature> B<false>|B<true>
3759 Controls the behavior of the B<Temperature> setting above. If set to B<false>
3760 (the default) only temperatures matching a B<Temperature> option are reported
3761 or, if no B<Temperature> option is specified, all temperatures are reported. If
3762 set to B<true>, matching temperatures are I<ignored> and all other temperatures
3765 Known temperature names are:
3799 =item B<ShowPower> B<true>|B<false>
3801 If enabled (the default) various temperatures of the MIC system are reported.
3803 =item B<Power> I<Name>
3805 This option controls which power readings are being reported. Whether matching
3806 power readings are being ignored or I<only> matching power readings are reported
3807 depends on the B<IgnoreSelectedPower> setting below. By default I<all>
3808 power readings are reported.
3810 =item B<IgnoreSelectedPower> B<false>|B<true>
3812 Controls the behavior of the B<Power> setting above. If set to B<false>
3813 (the default) only power readings matching a B<Power> option are reported
3814 or, if no B<Power> option is specified, all power readings are reported. If
3815 set to B<true>, matching power readings are I<ignored> and all other power readings
3818 Known power names are:
3824 Total power utilization averaged over Time Window 0 (uWatts).
3828 Total power utilization averaged over Time Window 0 (uWatts).
3832 Instantaneous power (uWatts).
3836 Max instantaneous power (uWatts).
3840 PCI-E connector power (uWatts).
3844 2x3 connector power (uWatts).
3848 2x4 connector power (uWatts).
3856 Uncore rail (uVolts).
3860 Memory subsystem rail (uVolts).
3866 =head2 Plugin C<memory>
3868 The I<memory plugin> provides the following configuration options:
3872 =item B<ValuesAbsolute> B<true>|B<false>
3874 Enables or disables reporting of physical memory usage in absolute numbers,
3875 i.e. bytes. Defaults to B<true>.
3877 =item B<ValuesPercentage> B<false>|B<true>
3879 Enables or disables reporting of physical memory usage in percentages, e.g.
3880 percent of physical memory used. Defaults to B<false>.
3882 This is useful for deploying I<collectd> in a heterogeneous environment in
3883 which the sizes of physical memory vary.
3887 =head2 Plugin C<modbus>
3889 The B<modbus plugin> connects to a Modbus "slave" via Modbus/TCP or Modbus/RTU and
3890 reads register values. It supports reading single registers (unsigned 16E<nbsp>bit
3891 values), large integer values (unsigned 32E<nbsp>bit values) and floating point
3892 values (two registers interpreted as IEEE floats in big endian notation).
3896 <Data "voltage-input-1">
3899 RegisterCmd ReadHolding
3904 <Data "voltage-input-2">
3907 RegisterCmd ReadHolding
3912 <Data "supply-temperature-1">
3915 RegisterCmd ReadHolding
3920 <Host "modbus.example.com">
3921 Address "192.168.0.42"
3926 Instance "power-supply"
3927 Collect "voltage-input-1"
3928 Collect "voltage-input-2"
3933 Device "/dev/ttyUSB0"
3938 Instance "temperature"
3939 Collect "supply-temperature-1"
3945 =item E<lt>B<Data> I<Name>E<gt> blocks
3947 Data blocks define a mapping between register numbers and the "types" used by
3950 Within E<lt>DataE<nbsp>/E<gt> blocks, the following options are allowed:
3954 =item B<RegisterBase> I<Number>
3956 Configures the base register to read from the device. If the option
3957 B<RegisterType> has been set to B<Uint32> or B<Float>, this and the next
3958 register will be read (the register number is increased by one).
3960 =item B<RegisterType> B<Int16>|B<Int32>|B<Uint16>|B<Uint32>|B<Float>
3962 Specifies what kind of data is returned by the device. If the type is B<Int32>,
3963 B<Uint32> or B<Float>, two 16E<nbsp>bit registers will be read and the data is
3964 combined into one value. Defaults to B<Uint16>.
3966 =item B<RegisterCmd> B<ReadHolding>|B<ReadInput>
3968 Specifies register type to be collected from device. Works only with libmodbus
3969 2.9.2 or higher. Defaults to B<ReadHolding>.
3971 =item B<Type> I<Type>
3973 Specifies the "type" (data set) to use when dispatching the value to
3974 I<collectd>. Currently, only data sets with exactly one data source are
3977 =item B<Instance> I<Instance>
3979 Sets the type instance to use when dispatching the value to I<collectd>. If
3980 unset, an empty string (no type instance) is used.
3984 =item E<lt>B<Host> I<Name>E<gt> blocks
3986 Host blocks are used to specify to which hosts to connect and what data to read
3987 from their "slaves". The string argument I<Name> is used as hostname when
3988 dispatching the values to I<collectd>.
3990 Within E<lt>HostE<nbsp>/E<gt> blocks, the following options are allowed:
3994 =item B<Address> I<Hostname>
3996 For Modbus/TCP, specifies the node name (the actual network address) used to
3997 connect to the host. This may be an IP address or a hostname. Please note that
3998 the used I<libmodbus> library only supports IPv4 at the moment.
4000 =item B<Port> I<Service>
4002 for Modbus/TCP, specifies the port used to connect to the host. The port can
4003 either be given as a number or as a service name. Please note that the
4004 I<Service> argument must be a string, even if ports are given in their numerical
4005 form. Defaults to "502".
4007 =item B<Device> I<Devicenode>
4009 For Modbus/RTU, specifies the path to the serial device being used.
4011 =item B<Baudrate> I<Baudrate>
4013 For Modbus/RTU, specifies the baud rate of the serial device.
4014 Note, connections currently support only 8/N/1.
4016 =item B<Interval> I<Interval>
4018 Sets the interval (in seconds) in which the values will be collected from this
4019 host. By default the global B<Interval> setting will be used.
4021 =item E<lt>B<Slave> I<ID>E<gt>
4023 Over each connection, multiple Modbus devices may be reached. The slave ID
4024 is used to specify which device should be addressed. For each device you want
4025 to query, one B<Slave> block must be given.
4027 Within E<lt>SlaveE<nbsp>/E<gt> blocks, the following options are allowed:
4031 =item B<Instance> I<Instance>
4033 Specify the plugin instance to use when dispatching the values to I<collectd>.
4034 By default "slave_I<ID>" is used.
4036 =item B<Collect> I<DataName>
4038 Specifies which data to retrieve from the device. I<DataName> must be the same
4039 string as the I<Name> argument passed to a B<Data> block. You can specify this
4040 option multiple times to collect more than one value from a slave. At least one
4041 B<Collect> option is mandatory.
4049 =head2 Plugin C<mqtt>
4051 The I<MQTT plugin> can send metrics to MQTT (B<Publish> blocks) and receive
4052 values from MQTT (B<Subscribe> blocks).
4058 Host "mqtt.example.com"
4062 Host "mqtt.example.com"
4067 The plugin's configuration is in B<Publish> and/or B<Subscribe> blocks,
4068 configuring the sending and receiving direction respectively. The plugin will
4069 register a write callback named C<mqtt/I<name>> where I<name> is the string
4070 argument given to the B<Publish> block. Both types of blocks share many but not
4071 all of the following options. If an option is valid in only one of the blocks,
4072 it will be mentioned explicitly.
4078 =item B<Host> I<Hostname>
4080 Hostname of the MQTT broker to connect to.
4082 =item B<Port> I<Service>
4084 Port number or service name of the MQTT broker to connect to.
4086 =item B<User> I<UserName>
4088 Username used when authenticating to the MQTT broker.
4090 =item B<Password> I<Password>
4092 Password used when authenticating to the MQTT broker.
4094 =item B<ClientId> I<ClientId>
4096 MQTT client ID to use. Defaults to the hostname used by I<collectd>.
4098 =item B<QoS> [B<0>-B<2>]
4100 Sets the I<Quality of Service>, with the values C<0>, C<1> and C<2> meaning:
4118 In B<Publish> blocks, this option determines the QoS flag set on outgoing
4119 messages and defaults to B<0>. In B<Subscribe> blocks, determines the maximum
4120 QoS setting the client is going to accept and defaults to B<2>. If the QoS flag
4121 on a message is larger than the maximum accepted QoS of a subscriber, the
4122 message's QoS will be downgraded.
4124 =item B<Prefix> I<Prefix> (Publish only)
4126 This plugin will use one topic per I<value list> which will looks like a path.
4127 I<Prefix> is used as the first path element and defaults to B<collectd>.
4129 An example topic name would be:
4131 collectd/cpu-0/cpu-user
4133 =item B<Retain> B<false>|B<true> (Publish only)
4135 Controls whether the MQTT broker will retain (keep a copy of) the last message
4136 sent to each topic and deliver it to new subscribers. Defaults to B<false>.
4138 =item B<StoreRates> B<true>|B<false> (Publish only)
4140 Controls whether C<DERIVE> and C<COUNTER> metrics are converted to a I<rate>
4141 before sending. Defaults to B<true>.
4143 =item B<CleanSession> B<true>|B<false> (Subscribe only)
4145 Controls whether the MQTT "cleans" the session up after the subscriber
4146 disconnects or if it maintains the subscriber's subscriptions and all messages
4147 that arrive while the subscriber is disconnected. Defaults to B<true>.
4149 =item B<Topic> I<TopicName> (Subscribe only)
4151 Configures the topic(s) to subscribe to. You can use the single level C<+> and
4152 multi level C<#> wildcards. Defaults to B<collectd/#>, i.e. all topics beneath
4153 the B<collectd> branch.
4155 =item B<CACert> I<file>
4157 Path to the PEM-encoded CA certificate file. Setting this option enables TLS
4158 communication with the MQTT broker, and as such, B<Port> should be the TLS-enabled
4159 port of the MQTT broker.
4160 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4162 =item B<CertificateFile> I<file>
4164 Path to the PEM-encoded certificate file to use as client certificate when
4165 connecting to the MQTT broker.
4166 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4168 =item B<CertificateKeyFile> I<file>
4170 Path to the unencrypted PEM-encoded key file corresponding to B<CertificateFile>.
4171 A valid TLS configuration requires B<CACert>, B<CertificateFile> and B<CertificateKeyFile>.
4173 =item B<TLSProtocol> I<protocol>
4175 If configured, this specifies the string protocol version (e.g. C<tlsv1>,
4176 C<tlsv1.2>) to use for the TLS connection to the broker. If not set a default
4177 version is used which depends on the version of OpenSSL the Mosquitto library
4180 =item B<CipherSuite> I<ciphersuite>
4182 A string describing the ciphers available for use. See L<ciphers(1)> and the
4183 C<openssl ciphers> utility for more information. If unset, the default ciphers
4189 =head2 Plugin C<mysql>
4191 The C<mysql plugin> requires B<mysqlclient> to be installed. It connects to
4192 one or more databases when started and keeps the connection up as long as
4193 possible. When the connection is interrupted for whatever reason it will try
4194 to re-connect. The plugin will complain loudly in case anything goes wrong.
4196 This plugin issues the MySQL C<SHOW STATUS> / C<SHOW GLOBAL STATUS> command
4197 and collects information about MySQL network traffic, executed statements,
4198 requests, the query cache and threads by evaluating the
4199 C<Bytes_{received,sent}>, C<Com_*>, C<Handler_*>, C<Qcache_*> and C<Threads_*>
4200 return values. Please refer to the B<MySQL reference manual>, I<5.1.6. Server
4201 Status Variables> for an explanation of these values.
4203 Optionally, master and slave statistics may be collected in a MySQL
4204 replication setup. In that case, information about the synchronization state
4205 of the nodes are collected by evaluating the C<Position> return value of the
4206 C<SHOW MASTER STATUS> command and the C<Seconds_Behind_Master>,
4207 C<Read_Master_Log_Pos> and C<Exec_Master_Log_Pos> return values of the
4208 C<SHOW SLAVE STATUS> command. See the B<MySQL reference manual>,
4209 I<12.5.5.21 SHOW MASTER STATUS Syntax> and
4210 I<12.5.5.31 SHOW SLAVE STATUS Syntax> for details.
4222 SSLKey "/path/to/key.pem"
4223 SSLCert "/path/to/cert.pem"
4224 SSLCA "/path/to/ca.pem"
4225 SSLCAPath "/path/to/cas/"
4226 SSLCipher "DHE-RSA-AES256-SHA"
4232 Socket "/var/run/mysql/mysqld.sock"
4234 SlaveNotifications true
4240 Socket "/var/run/mysql/mysqld.sock"
4245 A B<Database> block defines one connection to a MySQL database. It accepts a
4246 single argument which specifies the name of the database. None of the other
4247 options are required. MySQL will use default values as documented in the
4248 "mysql_real_connect()" and "mysql_ssl_set()" sections in the
4249 B<MySQL reference manual>.
4253 =item B<Alias> I<Alias>
4255 Alias to use as sender instead of hostname when reporting. This may be useful
4256 when having cryptic hostnames.
4258 =item B<Host> I<Hostname>
4260 Hostname of the database server. Defaults to B<localhost>.
4262 =item B<User> I<Username>
4264 Username to use when connecting to the database. The user does not have to be
4265 granted any privileges (which is synonym to granting the C<USAGE> privilege),
4266 unless you want to collectd replication statistics (see B<MasterStats> and
4267 B<SlaveStats> below). In this case, the user needs the C<REPLICATION CLIENT>
4268 (or C<SUPER>) privileges. Else, any existing MySQL user will do.
4270 =item B<Password> I<Password>
4272 Password needed to log into the database.
4274 =item B<Database> I<Database>
4276 Select this database. Defaults to I<no database> which is a perfectly reasonable
4277 option for what this plugin does.
4279 =item B<Port> I<Port>
4281 TCP-port to connect to. The port must be specified in its numeric form, but it
4282 must be passed as a string nonetheless. For example:
4286 If B<Host> is set to B<localhost> (the default), this setting has no effect.
4287 See the documentation for the C<mysql_real_connect> function for details.
4289 =item B<Socket> I<Socket>
4291 Specifies the path to the UNIX domain socket of the MySQL server. This option
4292 only has any effect, if B<Host> is set to B<localhost> (the default).
4293 Otherwise, use the B<Port> option above. See the documentation for the
4294 C<mysql_real_connect> function for details.
4296 =item B<InnodbStats> I<true|false>
4298 If enabled, metrics about the InnoDB storage engine are collected.
4299 Disabled by default.
4301 =item B<MasterStats> I<true|false>
4303 =item B<SlaveStats> I<true|false>
4305 Enable the collection of master / slave statistics in a replication setup. In
4306 order to be able to get access to these statistics, the user needs special
4307 privileges. See the B<User> documentation above. Defaults to B<false>.
4309 =item B<SlaveNotifications> I<true|false>
4311 If enabled, the plugin sends a notification if the replication slave I/O and /
4312 or SQL threads are not running. Defaults to B<false>.
4314 =item B<WsrepStats> I<true|false>
4316 Enable the collection of wsrep plugin statistics, used in Master-Master
4317 replication setups like in MySQL Galera/Percona XtraDB Cluster.
4318 User needs only privileges to execute 'SHOW GLOBAL STATUS'
4320 =item B<ConnectTimeout> I<Seconds>
4322 Sets the connect timeout for the MySQL client.
4324 =item B<SSLKey> I<Path>
4326 If provided, the X509 key in PEM format.
4328 =item B<SSLCert> I<Path>
4330 If provided, the X509 cert in PEM format.
4332 =item B<SSLCA> I<Path>
4334 If provided, the CA file in PEM format (check OpenSSL docs).
4336 =item B<SSLCAPath> I<Path>
4338 If provided, the CA directory (check OpenSSL docs).
4340 =item B<SSLCipher> I<String>
4342 If provided, the SSL cipher to use.
4346 =head2 Plugin C<netapp>
4348 The netapp plugin can collect various performance and capacity information
4349 from a NetApp filer using the NetApp API.
4351 Please note that NetApp has a wide line of products and a lot of different
4352 software versions for each of these products. This plugin was developed for a
4353 NetApp FAS3040 running OnTap 7.2.3P8 and tested on FAS2050 7.3.1.1L1,
4354 FAS3140 7.2.5.1 and FAS3020 7.2.4P9. It I<should> work for most combinations of
4355 model and software version but it is very hard to test this.
4356 If you have used this plugin with other models and/or software version, feel
4357 free to send us a mail to tell us about the results, even if it's just a short
4360 To collect these data collectd will log in to the NetApp via HTTP(S) and HTTP
4361 basic authentication.
4363 B<Do not use a regular user for this!> Create a special collectd user with just
4364 the minimum of capabilities needed. The user only needs the "login-http-admin"
4365 capability as well as a few more depending on which data will be collected.
4366 Required capabilities are documented below.
4371 <Host "netapp1.example.com">
4395 IgnoreSelectedIO false
4397 IgnoreSelectedOps false
4398 GetLatency "volume0"
4399 IgnoreSelectedLatency false
4406 IgnoreSelectedCapacity false
4409 IgnoreSelectedSnapshot false
4437 The netapp plugin accepts the following configuration options:
4441 =item B<Host> I<Name>
4443 A host block defines one NetApp filer. It will appear in collectd with the name
4444 you specify here which does not have to be its real name nor its hostname (see
4445 the B<Address> option below).
4447 =item B<VFiler> I<Name>
4449 A B<VFiler> block may only be used inside a host block. It accepts all the
4450 same options as the B<Host> block (except for cascaded B<VFiler> blocks) and
4451 will execute all NetApp API commands in the context of the specified
4452 VFiler(R). It will appear in collectd with the name you specify here which
4453 does not have to be its real name. The VFiler name may be specified using the
4454 B<VFilerName> option. If this is not specified, it will default to the name
4457 The VFiler block inherits all connection related settings from the surrounding
4458 B<Host> block (which appear before the B<VFiler> block) but they may be
4459 overwritten inside the B<VFiler> block.
4461 This feature is useful, for example, when using a VFiler as SnapVault target
4462 (supported since OnTap 8.1). In that case, the SnapVault statistics are not
4463 available in the host filer (vfiler0) but only in the respective VFiler
4466 =item B<Protocol> B<httpd>|B<http>
4468 The protocol collectd will use to query this host.
4476 Valid options: http, https
4478 =item B<Address> I<Address>
4480 The hostname or IP address of the host.
4486 Default: The "host" block's name.
4488 =item B<Port> I<Port>
4490 The TCP port to connect to on the host.
4496 Default: 80 for protocol "http", 443 for protocol "https"
4498 =item B<User> I<User>
4500 =item B<Password> I<Password>
4502 The username and password to use to login to the NetApp.
4508 =item B<VFilerName> I<Name>
4510 The name of the VFiler in which context to execute API commands. If not
4511 specified, the name provided to the B<VFiler> block will be used instead.
4517 Default: name of the B<VFiler> block
4519 B<Note:> This option may only be used inside B<VFiler> blocks.
4521 =item B<Interval> I<Interval>
4527 The following options decide what kind of data will be collected. You can
4528 either use them as a block and fine tune various parameters inside this block,
4529 use them as a single statement to just accept all default values, or omit it to
4530 not collect any data.
4532 The following options are valid inside all blocks:
4536 =item B<Interval> I<Seconds>
4538 Collect the respective statistics every I<Seconds> seconds. Defaults to the
4539 host specific setting.
4543 =head3 The System block
4545 This will collect various performance data about the whole system.
4547 B<Note:> To get this data the collectd user needs the
4548 "api-perf-object-get-instances" capability.
4552 =item B<Interval> I<Seconds>
4554 Collect disk statistics every I<Seconds> seconds.
4556 =item B<GetCPULoad> B<true>|B<false>
4558 If you set this option to true the current CPU usage will be read. This will be
4559 the average usage between all CPUs in your NetApp without any information about
4562 B<Note:> These are the same values that the NetApp CLI command "sysstat"
4563 returns in the "CPU" field.
4571 Result: Two value lists of type "cpu", and type instances "idle" and "system".
4573 =item B<GetInterfaces> B<true>|B<false>
4575 If you set this option to true the current traffic of the network interfaces
4576 will be read. This will be the total traffic over all interfaces of your NetApp
4577 without any information about individual interfaces.
4579 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4580 in the "Net kB/s" field.
4590 Result: One value list of type "if_octects".
4592 =item B<GetDiskIO> B<true>|B<false>
4594 If you set this option to true the current IO throughput will be read. This
4595 will be the total IO of your NetApp without any information about individual
4596 disks, volumes or aggregates.
4598 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4599 in the "DiskE<nbsp>kB/s" field.
4607 Result: One value list of type "disk_octets".
4609 =item B<GetDiskOps> B<true>|B<false>
4611 If you set this option to true the current number of HTTP, NFS, CIFS, FCP,
4612 iSCSI, etc. operations will be read. This will be the total number of
4613 operations on your NetApp without any information about individual volumes or
4616 B<Note:> These are the same values that the NetApp CLI command "sysstat"
4617 returns in the "NFS", "CIFS", "HTTP", "FCP" and "iSCSI" fields.
4625 Result: A variable number of value lists of type "disk_ops_complex". Each type
4626 of operation will result in one value list with the name of the operation as
4631 =head3 The WAFL block
4633 This will collect various performance data about the WAFL file system. At the
4634 moment this just means cache performance.
4636 B<Note:> To get this data the collectd user needs the
4637 "api-perf-object-get-instances" capability.
4639 B<Note:> The interface to get these values is classified as "Diagnostics" by
4640 NetApp. This means that it is not guaranteed to be stable even between minor
4645 =item B<Interval> I<Seconds>
4647 Collect disk statistics every I<Seconds> seconds.
4649 =item B<GetNameCache> B<true>|B<false>
4657 Result: One value list of type "cache_ratio" and type instance
4660 =item B<GetDirCache> B<true>|B<false>
4668 Result: One value list of type "cache_ratio" and type instance "find_dir_hit".
4670 =item B<GetInodeCache> B<true>|B<false>
4678 Result: One value list of type "cache_ratio" and type instance
4681 =item B<GetBufferCache> B<true>|B<false>
4683 B<Note:> This is the same value that the NetApp CLI command "sysstat" returns
4684 in the "Cache hit" field.
4692 Result: One value list of type "cache_ratio" and type instance "buf_hash_hit".
4696 =head3 The Disks block
4698 This will collect performance data about the individual disks in the NetApp.
4700 B<Note:> To get this data the collectd user needs the
4701 "api-perf-object-get-instances" capability.
4705 =item B<Interval> I<Seconds>
4707 Collect disk statistics every I<Seconds> seconds.
4709 =item B<GetBusy> B<true>|B<false>
4711 If you set this option to true the busy time of all disks will be calculated
4712 and the value of the busiest disk in the system will be written.
4714 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
4715 in the "Disk util" field. Probably.
4723 Result: One value list of type "percent" and type instance "disk_busy".
4727 =head3 The VolumePerf block
4729 This will collect various performance data about the individual volumes.
4731 You can select which data to collect about which volume using the following
4732 options. They follow the standard ignorelist semantic.
4734 B<Note:> To get this data the collectd user needs the
4735 I<api-perf-object-get-instances> capability.
4739 =item B<Interval> I<Seconds>
4741 Collect volume performance data every I<Seconds> seconds.
4743 =item B<GetIO> I<Volume>
4745 =item B<GetOps> I<Volume>
4747 =item B<GetLatency> I<Volume>
4749 Select the given volume for IO, operations or latency statistics collection.
4750 The argument is the name of the volume without the C</vol/> prefix.
4752 Since the standard ignorelist functionality is used here, you can use a string
4753 starting and ending with a slash to specify regular expression matching: To
4754 match the volumes "vol0", "vol2" and "vol7", you can use this regular
4757 GetIO "/^vol[027]$/"
4759 If no regular expression is specified, an exact match is required. Both,
4760 regular and exact matching are case sensitive.
4762 If no volume was specified at all for either of the three options, that data
4763 will be collected for all available volumes.
4765 See F</"IGNORELISTS"> for details.
4767 =item B<IgnoreSelectedIO> B<true>|B<false>
4769 =item B<IgnoreSelectedOps> B<true>|B<false>
4771 =item B<IgnoreSelectedLatency> B<true>|B<false>
4773 When set to B<true>, the volumes selected for IO, operations or latency
4774 statistics collection will be ignored and the data will be collected for all
4777 When set to B<false>, data will only be collected for the specified volumes and
4778 all other volumes will be ignored.
4780 If no volumes have been specified with the above B<Get*> options, all volumes
4781 will be collected regardless of the B<IgnoreSelected*> option.
4783 Defaults to B<false>
4787 =head3 The VolumeUsage block
4789 This will collect capacity data about the individual volumes.
4791 B<Note:> To get this data the collectd user needs the I<api-volume-list-info>
4796 =item B<Interval> I<Seconds>
4798 Collect volume usage statistics every I<Seconds> seconds.
4800 =item B<GetCapacity> I<VolumeName>
4802 The current capacity of the volume will be collected. This will result in two
4803 to four value lists, depending on the configuration of the volume. All data
4804 sources are of type "df_complex" with the name of the volume as
4807 There will be type_instances "used" and "free" for the number of used and
4808 available bytes on the volume. If the volume has some space reserved for
4809 snapshots, a type_instance "snap_reserved" will be available. If the volume
4810 has SIS enabled, a type_instance "sis_saved" will be available. This is the
4811 number of bytes saved by the SIS feature.
4813 B<Note:> The current NetApp API has a bug that results in this value being
4814 reported as a 32E<nbsp>bit number. This plugin tries to guess the correct
4815 number which works most of the time. If you see strange values here, bug
4816 NetApp support to fix this.
4818 Repeat this option to specify multiple volumes.
4820 =item B<IgnoreSelectedCapacity> B<true>|B<false>
4822 Specify whether to collect only the volumes selected by the B<GetCapacity>
4823 option or to ignore those volumes. B<IgnoreSelectedCapacity> defaults to
4824 B<false>. However, if no B<GetCapacity> option is specified at all, all
4825 capacities will be selected anyway.
4827 =item B<GetSnapshot> I<VolumeName>
4829 Select volumes from which to collect snapshot information.
4831 Usually, the space used for snapshots is included in the space reported as
4832 "used". If snapshot information is collected as well, the space used for
4833 snapshots is subtracted from the used space.
4835 To make things even more interesting, it is possible to reserve space to be
4836 used for snapshots. If the space required for snapshots is less than that
4837 reserved space, there is "reserved free" and "reserved used" space in addition
4838 to "free" and "used". If the space required for snapshots exceeds the reserved
4839 space, that part allocated in the normal space is subtracted from the "used"
4842 Repeat this option to specify multiple volumes.
4844 =item B<IgnoreSelectedSnapshot>
4846 Specify whether to collect only the volumes selected by the B<GetSnapshot>
4847 option or to ignore those volumes. B<IgnoreSelectedSnapshot> defaults to
4848 B<false>. However, if no B<GetSnapshot> option is specified at all, all
4849 capacities will be selected anyway.
4853 =head3 The Quota block
4855 This will collect (tree) quota statistics (used disk space and number of used
4856 files). This mechanism is useful to get usage information for single qtrees.
4857 In case the quotas are not used for any other purpose, an entry similar to the
4858 following in C</etc/quotas> would be sufficient:
4860 /vol/volA/some_qtree tree - - - - -
4862 After adding the entry, issue C<quota on -w volA> on the NetApp filer.
4866 =item B<Interval> I<Seconds>
4868 Collect SnapVault(R) statistics every I<Seconds> seconds.
4872 =head3 The SnapVault block
4874 This will collect statistics about the time and traffic of SnapVault(R)
4879 =item B<Interval> I<Seconds>
4881 Collect SnapVault(R) statistics every I<Seconds> seconds.
4885 =head2 Plugin C<netlink>
4887 The C<netlink> plugin uses a netlink socket to query the Linux kernel about
4888 statistics of various interface and routing aspects.
4892 =item B<Interface> I<Interface>
4894 =item B<VerboseInterface> I<Interface>
4896 Instruct the plugin to collect interface statistics. This is basically the same
4897 as the statistics provided by the C<interface> plugin (see above) but
4898 potentially much more detailed.
4900 When configuring with B<Interface> only the basic statistics will be collected,
4901 namely octets, packets, and errors. These statistics are collected by
4902 the C<interface> plugin, too, so using both at the same time is no benefit.
4904 When configured with B<VerboseInterface> all counters B<except> the basic ones,
4905 so that no data needs to be collected twice if you use the C<interface> plugin.
4906 This includes dropped packets, received multicast packets, collisions and a
4907 whole zoo of differentiated RX and TX errors. You can try the following command
4908 to get an idea of what awaits you:
4912 If I<Interface> is B<All>, all interfaces will be selected.
4914 =item B<QDisc> I<Interface> [I<QDisc>]
4916 =item B<Class> I<Interface> [I<Class>]
4918 =item B<Filter> I<Interface> [I<Filter>]
4920 Collect the octets and packets that pass a certain qdisc, class or filter.
4922 QDiscs and classes are identified by their type and handle (or classid).
4923 Filters don't necessarily have a handle, therefore the parent's handle is used.
4924 The notation used in collectd differs from that used in tc(1) in that it
4925 doesn't skip the major or minor number if it's zero and doesn't print special
4926 ids by their name. So, for example, a qdisc may be identified by
4927 C<pfifo_fast-1:0> even though the minor number of B<all> qdiscs is zero and
4928 thus not displayed by tc(1).
4930 If B<QDisc>, B<Class>, or B<Filter> is given without the second argument,
4931 i.E<nbsp>.e. without an identifier, all qdiscs, classes, or filters that are
4932 associated with that interface will be collected.
4934 Since a filter itself doesn't necessarily have a handle, the parent's handle is
4935 used. This may lead to problems when more than one filter is attached to a
4936 qdisc or class. This isn't nice, but we don't know how this could be done any
4937 better. If you have a idea, please don't hesitate to tell us.
4939 As with the B<Interface> option you can specify B<All> as the interface,
4940 meaning all interfaces.
4942 Here are some examples to help you understand the above text more easily:
4945 VerboseInterface "All"
4946 QDisc "eth0" "pfifo_fast-1:0"
4948 Class "ppp0" "htb-1:10"
4949 Filter "ppp0" "u32-1:0"
4952 See F</"IGNORELISTS"> for details.
4954 =item B<IgnoreSelected>
4956 The behavior is the same as with all other similar plugins: If nothing is
4957 selected at all, everything is collected. If some things are selected using the
4958 options described above, only these statistics are collected. If you set
4959 B<IgnoreSelected> to B<true>, this behavior is inverted, i.E<nbsp>e. the
4960 specified statistics will not be collected.
4964 =head2 Plugin C<network>
4966 The Network plugin sends data to a remote instance of collectd, receives data
4967 from a remote instance, or both at the same time. Data which has been received
4968 from the network is usually not transmitted again, but this can be activated, see
4969 the B<Forward> option below.
4971 The default IPv6 multicast group is C<ff18::efc0:4a42>. The default IPv4
4972 multicast group is C<239.192.74.66>. The default I<UDP> port is B<25826>.
4974 Both, B<Server> and B<Listen> can be used as single option or as block. When
4975 used as block, given options are valid for this socket only. The following
4976 example will export the metrics twice: Once to an "internal" server (without
4977 encryption and signing) and one to an external server (with cryptographic
4981 # Export to an internal server
4982 # (demonstrates usage without additional options)
4983 Server "collectd.internal.tld"
4985 # Export to an external server
4986 # (demonstrates usage with signature options)
4987 <Server "collectd.external.tld">
4988 SecurityLevel "sign"
4989 Username "myhostname"
4996 =item B<E<lt>Server> I<Host> [I<Port>]B<E<gt>>
4998 The B<Server> statement/block sets the server to send datagrams to. The
4999 statement may occur multiple times to send each datagram to multiple
5002 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. The
5003 optional second argument specifies a port number or a service name. If not
5004 given, the default, B<25826>, is used.
5006 The following options are recognized within B<Server> blocks:
5010 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
5012 Set the security you require for network communication. When the security level
5013 has been set to B<Encrypt>, data sent over the network will be encrypted using
5014 I<AES-256>. The integrity of encrypted packets is ensured using I<SHA-1>. When
5015 set to B<Sign>, transmitted data is signed using the I<HMAC-SHA-256> message
5016 authentication code. When set to B<None>, data is sent without any security.
5018 This feature is only available if the I<network> plugin was linked with
5021 =item B<Username> I<Username>
5023 Sets the username to transmit. This is used by the server to lookup the
5024 password. See B<AuthFile> below. All security levels except B<None> require
5027 This feature is only available if the I<network> plugin was linked with
5030 =item B<Password> I<Password>
5032 Sets a password (shared secret) for this socket. All security levels except
5033 B<None> require this setting.
5035 This feature is only available if the I<network> plugin was linked with
5038 =item B<Interface> I<Interface name>
5040 Set the outgoing interface for IP packets. This applies at least
5041 to IPv6 packets and if possible to IPv4. If this option is not applicable,
5042 undefined or a non-existent interface name is specified, the default
5043 behavior is to let the kernel choose the appropriate interface. Be warned
5044 that the manual selection of an interface for unicast traffic is only
5045 necessary in rare cases.
5047 =item B<ResolveInterval> I<Seconds>
5049 Sets the interval at which to re-resolve the DNS for the I<Host>. This is
5050 useful to force a regular DNS lookup to support a high availability setup. If
5051 not specified, re-resolves are never attempted.
5055 =item B<E<lt>Listen> I<Host> [I<Port>]B<E<gt>>
5057 The B<Listen> statement sets the interfaces to bind to. When multiple
5058 statements are found the daemon will bind to multiple interfaces.
5060 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. If
5061 the argument is a multicast address the daemon will join that multicast group.
5062 The optional second argument specifies a port number or a service name. If not
5063 given, the default, B<25826>, is used.
5065 The following options are recognized within C<E<lt>ListenE<gt>> blocks:
5069 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
5071 Set the security you require for network communication. When the security level
5072 has been set to B<Encrypt>, only encrypted data will be accepted. The integrity
5073 of encrypted packets is ensured using I<SHA-1>. When set to B<Sign>, only
5074 signed and encrypted data is accepted. When set to B<None>, all data will be
5075 accepted. If an B<AuthFile> option was given (see below), encrypted data is
5076 decrypted if possible.
5078 This feature is only available if the I<network> plugin was linked with
5081 =item B<AuthFile> I<Filename>
5083 Sets a file in which usernames are mapped to passwords. These passwords are
5084 used to verify signatures and to decrypt encrypted network packets. If
5085 B<SecurityLevel> is set to B<None>, this is optional. If given, signed data is
5086 verified and encrypted packets are decrypted. Otherwise, signed data is
5087 accepted without checking the signature and encrypted data cannot be decrypted.
5088 For the other security levels this option is mandatory.
5090 The file format is very simple: Each line consists of a username followed by a
5091 colon and any number of spaces followed by the password. To demonstrate, an
5092 example file could look like this:
5097 Each time a packet is received, the modification time of the file is checked
5098 using L<stat(2)>. If the file has been changed, the contents is re-read. While
5099 the file is being read, it is locked using L<fcntl(2)>.
5101 =item B<Interface> I<Interface name>
5103 Set the incoming interface for IP packets explicitly. This applies at least
5104 to IPv6 packets and if possible to IPv4. If this option is not applicable,
5105 undefined or a non-existent interface name is specified, the default
5106 behavior is, to let the kernel choose the appropriate interface. Thus incoming
5107 traffic gets only accepted, if it arrives on the given interface.
5111 =item B<TimeToLive> I<1-255>
5113 Set the time-to-live of sent packets. This applies to all, unicast and
5114 multicast, and IPv4 and IPv6 packets. The default is to not change this value.
5115 That means that multicast packets will be sent with a TTL of C<1> (one) on most
5118 =item B<MaxPacketSize> I<1024-65535>
5120 Set the maximum size for datagrams received over the network. Packets larger
5121 than this will be truncated. Defaults to 1452E<nbsp>bytes, which is the maximum
5122 payload size that can be transmitted in one Ethernet frame using IPv6E<nbsp>/
5125 On the server side, this limit should be set to the largest value used on
5126 I<any> client. Likewise, the value on the client must not be larger than the
5127 value on the server, or data will be lost.
5129 B<Compatibility:> Versions prior to I<versionE<nbsp>4.8> used a fixed sized
5130 buffer of 1024E<nbsp>bytes. Versions I<4.8>, I<4.9> and I<4.10> used a default
5131 value of 1024E<nbsp>bytes to avoid problems when sending data to an older
5134 =item B<Forward> I<true|false>
5136 If set to I<true>, write packets that were received via the network plugin to
5137 the sending sockets. This should only be activated when the B<Listen>- and
5138 B<Server>-statements differ. Otherwise packets may be send multiple times to
5139 the same multicast group. While this results in more network traffic than
5140 necessary it's not a huge problem since the plugin has a duplicate detection,
5141 so the values will not loop.
5143 =item B<ReportStats> B<true>|B<false>
5145 The network plugin cannot only receive and send statistics, it can also create
5146 statistics about itself. Collectd data included the number of received and
5147 sent octets and packets, the length of the receive queue and the number of
5148 values handled. When set to B<true>, the I<Network plugin> will make these
5149 statistics available. Defaults to B<false>.
5153 =head2 Plugin C<nginx>
5155 This plugin collects the number of connections and requests handled by the
5156 C<nginx daemon> (speak: engineE<nbsp>X), a HTTP and mail server/proxy. It
5157 queries the page provided by the C<ngx_http_stub_status_module> module, which
5158 isn't compiled by default. Please refer to
5159 L<http://wiki.codemongers.com/NginxStubStatusModule> for more information on
5160 how to compile and configure nginx and this module.
5162 The following options are accepted by the C<nginx plugin>:
5166 =item B<URL> I<http://host/nginx_status>
5168 Sets the URL of the C<ngx_http_stub_status_module> output.
5170 =item B<User> I<Username>
5172 Optional user name needed for authentication.
5174 =item B<Password> I<Password>
5176 Optional password needed for authentication.
5178 =item B<VerifyPeer> B<true|false>
5180 Enable or disable peer SSL certificate verification. See
5181 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
5183 =item B<VerifyHost> B<true|false>
5185 Enable or disable peer host name verification. If enabled, the plugin checks
5186 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
5187 certificate matches the host name provided by the B<URL> option. If this
5188 identity check fails, the connection is aborted. Obviously, only works when
5189 connecting to a SSL enabled server. Enabled by default.
5191 =item B<CACert> I<File>
5193 File that holds one or more SSL certificates. If you want to use HTTPS you will
5194 possibly need this option. What CA certificates come bundled with C<libcurl>
5195 and are checked by default depends on the distribution you use.
5197 =item B<Timeout> I<Milliseconds>
5199 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
5200 milliseconds. By default, the configured B<Interval> is used to set the
5205 =head2 Plugin C<notify_desktop>
5207 This plugin sends a desktop notification to a notification daemon, as defined
5208 in the Desktop Notification Specification. To actually display the
5209 notifications, B<notification-daemon> is required and B<collectd> has to be
5210 able to access the X server (i.E<nbsp>e., the C<DISPLAY> and C<XAUTHORITY>
5211 environment variables have to be set correctly) and the D-Bus message bus.
5213 The Desktop Notification Specification can be found at
5214 L<http://www.galago-project.org/specs/notification/>.
5218 =item B<OkayTimeout> I<timeout>
5220 =item B<WarningTimeout> I<timeout>
5222 =item B<FailureTimeout> I<timeout>
5224 Set the I<timeout>, in milliseconds, after which to expire the notification
5225 for C<OKAY>, C<WARNING> and C<FAILURE> severities respectively. If zero has
5226 been specified, the displayed notification will not be closed at all - the
5227 user has to do so herself. These options default to 5000. If a negative number
5228 has been specified, the default is used as well.
5232 =head2 Plugin C<notify_email>
5234 The I<notify_email> plugin uses the I<ESMTP> library to send notifications to a
5235 configured email address.
5237 I<libESMTP> is available from L<http://www.stafford.uklinux.net/libesmtp/>.
5239 Available configuration options:
5243 =item B<From> I<Address>
5245 Email address from which the emails should appear to come from.
5247 Default: C<root@localhost>
5249 =item B<Recipient> I<Address>
5251 Configures the email address(es) to which the notifications should be mailed.
5252 May be repeated to send notifications to multiple addresses.
5254 At least one B<Recipient> must be present for the plugin to work correctly.
5256 =item B<SMTPServer> I<Hostname>
5258 Hostname of the SMTP server to connect to.
5260 Default: C<localhost>
5262 =item B<SMTPPort> I<Port>
5264 TCP port to connect to.
5268 =item B<SMTPUser> I<Username>
5270 Username for ASMTP authentication. Optional.
5272 =item B<SMTPPassword> I<Password>
5274 Password for ASMTP authentication. Optional.
5276 =item B<Subject> I<Subject>
5278 Subject-template to use when sending emails. There must be exactly two
5279 string-placeholders in the subject, given in the standard I<printf(3)> syntax,
5280 i.E<nbsp>e. C<%s>. The first will be replaced with the severity, the second
5283 Default: C<Collectd notify: %s@%s>
5287 =head2 Plugin C<notify_nagios>
5289 The I<notify_nagios> plugin writes notifications to Nagios' I<command file> as
5290 a I<passive service check result>.
5292 Available configuration options:
5296 =item B<CommandFile> I<Path>
5298 Sets the I<command file> to write to. Defaults to F</usr/local/nagios/var/rw/nagios.cmd>.
5302 =head2 Plugin C<ntpd>
5304 The C<ntpd> plugin collects per-peer ntp data such as time offset and time
5307 For talking to B<ntpd>, it mimics what the B<ntpdc> control program does on
5308 the wire - using B<mode 7> specific requests. This mode is deprecated with
5309 newer B<ntpd> releases (4.2.7p230 and later). For the C<ntpd> plugin to work
5310 correctly with them, the ntp daemon must be explicitly configured to
5311 enable B<mode 7> (which is disabled by default). Refer to the I<ntp.conf(5)>
5312 manual page for details.
5314 Available configuration options for the C<ntpd> plugin:
5318 =item B<Host> I<Hostname>
5320 Hostname of the host running B<ntpd>. Defaults to B<localhost>.
5322 =item B<Port> I<Port>
5324 UDP-Port to connect to. Defaults to B<123>.
5326 =item B<ReverseLookups> B<true>|B<false>
5328 Sets whether or not to perform reverse lookups on peers. Since the name or
5329 IP-address may be used in a filename it is recommended to disable reverse
5330 lookups. The default is to do reverse lookups to preserve backwards
5331 compatibility, though.
5333 =item B<IncludeUnitID> B<true>|B<false>
5335 When a peer is a refclock, include the unit ID in the I<type instance>.
5336 Defaults to B<false> for backward compatibility.
5338 If two refclock peers use the same driver and this is B<false>, the plugin will
5339 try to write simultaneous measurements from both to the same type instance.
5340 This will result in error messages in the log and only one set of measurements
5345 =head2 Plugin C<nut>
5349 =item B<UPS> I<upsname>B<@>I<hostname>[B<:>I<port>]
5351 Add a UPS to collect data from. The format is identical to the one accepted by
5354 =item B<ForceSSL> B<true>|B<false>
5356 Stops connections from falling back to unsecured if an SSL connection
5357 cannot be established. Defaults to false if undeclared.
5359 =item B<VerifyPeer> I<true>|I<false>
5361 If set to true, requires a CAPath be provided. Will use the CAPath to find
5362 certificates to use as Trusted Certificates to validate a upsd server certificate.
5363 If validation of the upsd server certificate fails, the connection will not be
5364 established. If ForceSSL is undeclared or set to false, setting VerifyPeer to true
5365 will override and set ForceSSL to true.
5367 =item B<CAPath> I/path/to/certs/folder
5369 If VerifyPeer is set to true, this is required. Otherwise this is ignored.
5370 The folder pointed at must contain certificate(s) named according to their hash.
5371 Ex: XXXXXXXX.Y where X is the hash value of a cert and Y is 0. If name collisions
5372 occur because two different certs have the same hash value, Y can be incremented
5373 in order to avoid conflict. To create a symbolic link to a certificate the following
5374 command can be used from within the directory where the cert resides:
5376 C<ln -s some.crt ./$(openssl x509 -hash -noout -in some.crt).0>
5378 Alternatively, the package openssl-perl provides a command C<c_rehash> that will
5379 generate links like the one described above for ALL certs in a given folder.
5381 C<c_rehash /path/to/certs/folder>
5385 =head2 Plugin C<olsrd>
5387 The I<olsrd> plugin connects to the TCP port opened by the I<txtinfo> plugin of
5388 the Optimized Link State Routing daemon and reads information about the current
5389 state of the meshed network.
5391 The following configuration options are understood:
5395 =item B<Host> I<Host>
5397 Connect to I<Host>. Defaults to B<"localhost">.
5399 =item B<Port> I<Port>
5401 Specifies the port to connect to. This must be a string, even if you give the
5402 port as a number rather than a service name. Defaults to B<"2006">.
5404 =item B<CollectLinks> B<No>|B<Summary>|B<Detail>
5406 Specifies what information to collect about links, i.E<nbsp>e. direct
5407 connections of the daemon queried. If set to B<No>, no information is
5408 collected. If set to B<Summary>, the number of links and the average of all
5409 I<link quality> (LQ) and I<neighbor link quality> (NLQ) values is calculated.
5410 If set to B<Detail> LQ and NLQ are collected per link.
5412 Defaults to B<Detail>.
5414 =item B<CollectRoutes> B<No>|B<Summary>|B<Detail>
5416 Specifies what information to collect about routes of the daemon queried. If
5417 set to B<No>, no information is collected. If set to B<Summary>, the number of
5418 routes and the average I<metric> and I<ETX> is calculated. If set to B<Detail>
5419 metric and ETX are collected per route.
5421 Defaults to B<Summary>.
5423 =item B<CollectTopology> B<No>|B<Summary>|B<Detail>
5425 Specifies what information to collect about the global topology. If set to
5426 B<No>, no information is collected. If set to B<Summary>, the number of links
5427 in the entire topology and the average I<link quality> (LQ) is calculated.
5428 If set to B<Detail> LQ and NLQ are collected for each link in the entire topology.
5430 Defaults to B<Summary>.
5434 =head2 Plugin C<onewire>
5436 B<EXPERIMENTAL!> See notes below.
5438 The C<onewire> plugin uses the B<owcapi> library from the B<owfs> project
5439 L<http://owfs.org/> to read sensors connected via the onewire bus.
5441 It can be used in two possible modes - standard or advanced.
5443 In the standard mode only temperature sensors (sensors with the family code
5444 C<10>, C<22> and C<28> - e.g. DS1820, DS18S20, DS1920) can be read. If you have
5445 other sensors you would like to have included, please send a sort request to
5446 the mailing list. You can select sensors to be read or to be ignored depending
5447 on the option B<IgnoreSelected>). When no list is provided the whole bus is
5448 walked and all sensors are read.
5450 Hubs (the DS2409 chips) are working, but read the note, why this plugin is
5451 experimental, below.
5453 In the advanced mode you can configure any sensor to be read (only numerical
5454 value) using full OWFS path (e.g. "/uncached/10.F10FCA000800/temperature").
5455 In this mode you have to list all the sensors. Neither default bus walk nor
5456 B<IgnoreSelected> are used here. Address and type (file) is extracted from
5457 the path automatically and should produce compatible structure with the "standard"
5458 mode (basically the path is expected as for example
5459 "/uncached/10.F10FCA000800/temperature" where it would extract address part
5460 "F10FCA000800" and the rest after the slash is considered the type - here
5462 There are two advantages to this mode - you can access virtually any sensor
5463 (not just temperature), select whether to use cached or directly read values
5464 and it is slighlty faster. The downside is more complex configuration.
5466 The two modes are distinguished automatically by the format of the address.
5467 It is not possible to mix the two modes. Once a full path is detected in any
5468 B<Sensor> then the whole addressing (all sensors) is considered to be this way
5469 (and as standard addresses will fail parsing they will be ignored).
5473 =item B<Device> I<Device>
5475 Sets the device to read the values from. This can either be a "real" hardware
5476 device, such as a serial port or an USB port, or the address of the
5477 L<owserver(1)> socket, usually B<localhost:4304>.
5479 Though the documentation claims to automatically recognize the given address
5480 format, with versionE<nbsp>2.7p4 we had to specify the type explicitly. So
5481 with that version, the following configuration worked for us:
5484 Device "-s localhost:4304"
5487 This directive is B<required> and does not have a default value.
5489 =item B<Sensor> I<Sensor>
5491 In the standard mode selects sensors to collect or to ignore
5492 (depending on B<IgnoreSelected>, see below). Sensors are specified without
5493 the family byte at the beginning, so you have to use for example C<F10FCA000800>,
5494 and B<not> include the leading C<10.> family byte and point.
5495 When no B<Sensor> is configured the whole Onewire bus is walked and all supported
5496 sensors (see above) are read.
5498 In the advanced mode the B<Sensor> specifies full OWFS path - e.g.
5499 C</uncached/10.F10FCA000800/temperature> (or when cached values are OK
5500 C</10.F10FCA000800/temperature>). B<IgnoreSelected> is not used.
5502 As there can be multiple devices on the bus you can list multiple sensor (use
5503 multiple B<Sensor> elements).
5505 See F</"IGNORELISTS"> for details.
5507 =item B<IgnoreSelected> I<true>|I<false>
5509 If no configuration is given, the B<onewire> plugin will collect data from all
5510 sensors found. This may not be practical, especially if sensors are added and
5511 removed regularly. Sometimes, however, it's easier/preferred to collect only
5512 specific sensors or all sensors I<except> a few specified ones. This option
5513 enables you to do that: By setting B<IgnoreSelected> to I<true> the effect of
5514 B<Sensor> is inverted: All selected interfaces are ignored and all other
5515 interfaces are collected.
5517 Used only in the standard mode - see above.
5519 =item B<Interval> I<Seconds>
5521 Sets the interval in which all sensors should be read. If not specified, the
5522 global B<Interval> setting is used.
5526 B<EXPERIMENTAL!> The C<onewire> plugin is experimental, because it doesn't yet
5527 work with big setups. It works with one sensor being attached to one
5528 controller, but as soon as you throw in a couple more senors and maybe a hub
5529 or two, reading all values will take more than ten seconds (the default
5530 interval). We will probably add some separate thread for reading the sensors
5531 and some cache or something like that, but it's not done yet. We will try to
5532 maintain backwards compatibility in the future, but we can't promise. So in
5533 short: If it works for you: Great! But keep in mind that the config I<might>
5534 change, though this is unlikely. Oh, and if you want to help improving this
5535 plugin, just send a short notice to the mailing list. ThanksE<nbsp>:)
5537 =head2 Plugin C<openldap>
5539 To use the C<openldap> plugin you first need to configure the I<OpenLDAP>
5540 server correctly. The backend database C<monitor> needs to be loaded and
5541 working. See slapd-monitor(5) for the details.
5543 The configuration of the C<openldap> plugin consists of one or more B<Instance>
5544 blocks. Each block requires one string argument as the instance name. For
5549 URL "ldap://localhost/"
5552 URL "ldaps://localhost/"
5556 The instance name will be used as the I<plugin instance>. To emulate the old
5557 (versionE<nbsp>4) behavior, you can use an empty string (""). In order for the
5558 plugin to work correctly, each instance name must be unique. This is not
5559 enforced by the plugin and it is your responsibility to ensure it is.
5561 The following options are accepted within each B<Instance> block:
5565 =item B<URL> I<ldap://host/binddn>
5567 Sets the URL to use to connect to the I<OpenLDAP> server. This option is
5570 =item B<BindDN> I<BindDN>
5572 Name in the form of an LDAP distinguished name intended to be used for
5573 authentication. Defaults to empty string to establish an anonymous authorization.
5575 =item B<Password> I<Password>
5577 Password for simple bind authentication. If this option is not set,
5578 unauthenticated bind operation is used.
5580 =item B<StartTLS> B<true|false>
5582 Defines whether TLS must be used when connecting to the I<OpenLDAP> server.
5583 Disabled by default.
5585 =item B<VerifyHost> B<true|false>
5587 Enables or disables peer host name verification. If enabled, the plugin checks
5588 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
5589 certificate matches the host name provided by the B<URL> option. If this
5590 identity check fails, the connection is aborted. Enabled by default.
5592 =item B<CACert> I<File>
5594 File that holds one or more SSL certificates. If you want to use TLS/SSL you
5595 may possibly need this option. What CA certificates are checked by default
5596 depends on the distribution you use and can be changed with the usual ldap
5597 client configuration mechanisms. See ldap.conf(5) for the details.
5599 =item B<Timeout> I<Seconds>
5601 Sets the timeout value for ldap operations, in seconds. By default, the
5602 configured B<Interval> is used to set the timeout. Use B<-1> to disable
5605 =item B<Version> I<Version>
5607 An integer which sets the LDAP protocol version number to use when connecting
5608 to the I<OpenLDAP> server. Defaults to B<3> for using I<LDAPv3>.
5612 =head2 Plugin C<openvpn>
5614 The OpenVPN plugin reads a status file maintained by OpenVPN and gathers
5615 traffic statistics about connected clients.
5617 To set up OpenVPN to write to the status file periodically, use the
5618 B<--status> option of OpenVPN. Since OpenVPN can write two different formats,
5619 you need to set the required format, too. This is done by setting
5620 B<--status-version> to B<2>.
5622 So, in a nutshell you need:
5624 openvpn $OTHER_OPTIONS \
5625 --status "/var/run/openvpn-status" 10 \
5632 =item B<StatusFile> I<File>
5634 Specifies the location of the status file.
5636 =item B<ImprovedNamingSchema> B<true>|B<false>
5638 When enabled, the filename of the status file will be used as plugin instance
5639 and the client's "common name" will be used as type instance. This is required
5640 when reading multiple status files. Enabling this option is recommended, but to
5641 maintain backwards compatibility this option is disabled by default.
5643 =item B<CollectCompression> B<true>|B<false>
5645 Sets whether or not statistics about the compression used by OpenVPN should be
5646 collected. This information is only available in I<single> mode. Enabled by
5649 =item B<CollectIndividualUsers> B<true>|B<false>
5651 Sets whether or not traffic information is collected for each connected client
5652 individually. If set to false, currently no traffic data is collected at all
5653 because aggregating this data in a save manner is tricky. Defaults to B<true>.
5655 =item B<CollectUserCount> B<true>|B<false>
5657 When enabled, the number of currently connected clients or users is collected.
5658 This is especially interesting when B<CollectIndividualUsers> is disabled, but
5659 can be configured independently from that option. Defaults to B<false>.
5663 =head2 Plugin C<oracle>
5665 The "oracle" plugin uses the Oracle® Call Interface I<(OCI)> to connect to an
5666 Oracle® Database and lets you execute SQL statements there. It is very similar
5667 to the "dbi" plugin, because it was written around the same time. See the "dbi"
5668 plugin's documentation above for details.
5671 <Query "out_of_stock">
5672 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
5675 # InstancePrefix "foo"
5676 InstancesFrom "category"
5680 <Database "product_information">
5684 Query "out_of_stock"
5688 =head3 B<Query> blocks
5690 The Query blocks are handled identically to the Query blocks of the "dbi"
5691 plugin. Please see its documentation above for details on how to specify
5694 =head3 B<Database> blocks
5696 Database blocks define a connection to a database and which queries should be
5697 sent to that database. Each database needs a "name" as string argument in the
5698 starting tag of the block. This name will be used as "PluginInstance" in the
5699 values submitted to the daemon. Other than that, that name is not used.
5703 =item B<ConnectID> I<ID>
5705 Defines the "database alias" or "service name" to connect to. Usually, these
5706 names are defined in the file named C<$ORACLE_HOME/network/admin/tnsnames.ora>.
5708 =item B<Host> I<Host>
5710 Hostname to use when dispatching values for this database. Defaults to using
5711 the global hostname of the I<collectd> instance.
5713 =item B<Username> I<Username>
5715 Username used for authentication.
5717 =item B<Password> I<Password>
5719 Password used for authentication.
5721 =item B<Query> I<QueryName>
5723 Associates the query named I<QueryName> with this database connection. The
5724 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
5725 blocks you want to refer to must be placed above the database block you want to
5730 =head2 Plugin C<ovs_events>
5732 The I<ovs_events> plugin monitors the link status of I<Open vSwitch> (OVS)
5733 connected interfaces, dispatches the values to collectd and sends the
5734 notification whenever the link state change occurs. This plugin uses OVS
5735 database to get a link state change notification.
5739 <Plugin "ovs_events">
5742 Socket "/var/run/openvswitch/db.sock"
5743 Interfaces "br0" "veth0"
5744 SendNotification true
5745 DispatchValues false
5748 The plugin provides the following configuration options:
5752 =item B<Address> I<node>
5754 The address of the OVS DB server JSON-RPC interface used by the plugin. To
5755 enable the interface, OVS DB daemon should be running with C<--remote=ptcp:>
5756 option. See L<ovsdb-server(1)> for more details. The option may be either
5757 network hostname, IPv4 numbers-and-dots notation or IPv6 hexadecimal string
5758 format. Defaults to B<'localhost'>.
5760 =item B<Port> I<service>
5762 TCP-port to connect to. Either a service name or a port number may be given.
5763 Defaults to B<6640>.
5765 =item B<Socket> I<path>
5767 The UNIX domain socket path of OVS DB server JSON-RPC interface used by the
5768 plugin. To enable the interface, the OVS DB daemon should be running with
5769 C<--remote=punix:> option. See L<ovsdb-server(1)> for more details. If this
5770 option is set, B<Address> and B<Port> options are ignored.
5772 =item B<Interfaces> [I<ifname> ...]
5774 List of interface names to be monitored by this plugin. If this option is not
5775 specified or is empty then all OVS connected interfaces on all bridges are
5778 Default: empty (all interfaces on all bridges are monitored)
5780 =item B<SendNotification> I<true|false>
5782 If set to true, OVS link notifications (interface status and OVS DB connection
5783 terminate) are sent to collectd. Default value is true.
5785 =item B<DispatchValues> I<true|false>
5787 Dispatch the OVS DB interface link status value with configured plugin interval.
5788 Defaults to false. Please note, if B<SendNotification> and B<DispatchValues>
5789 options are false, no OVS information will be provided by the plugin.
5793 B<Note:> By default, the global interval setting is used within which to
5794 retrieve the OVS link status. To configure a plugin-specific interval, please
5795 use B<Interval> option of the OVS B<LoadPlugin> block settings. For milliseconds
5796 simple divide the time by 1000 for example if the desired interval is 50ms, set
5799 =head2 Plugin C<ovs_stats>
5801 The I<ovs_stats> plugin collects statistics of OVS connected interfaces.
5802 This plugin uses OVSDB management protocol (RFC7047) monitor mechanism to get
5803 statistics from OVSDB
5807 <Plugin "ovs_stats">
5810 Socket "/var/run/openvswitch/db.sock"
5811 Bridges "br0" "br_ext"
5814 The plugin provides the following configuration options:
5818 =item B<Address> I<node>
5820 The address of the OVS DB server JSON-RPC interface used by the plugin. To
5821 enable the interface, OVS DB daemon should be running with C<--remote=ptcp:>
5822 option. See L<ovsdb-server(1)> for more details. The option may be either
5823 network hostname, IPv4 numbers-and-dots notation or IPv6 hexadecimal string
5824 format. Defaults to B<'localhost'>.
5826 =item B<Port> I<service>
5828 TCP-port to connect to. Either a service name or a port number may be given.
5829 Defaults to B<6640>.
5831 =item B<Socket> I<path>
5833 The UNIX domain socket path of OVS DB server JSON-RPC interface used by the
5834 plugin. To enable the interface, the OVS DB daemon should be running with
5835 C<--remote=punix:> option. See L<ovsdb-server(1)> for more details. If this
5836 option is set, B<Address> and B<Port> options are ignored.
5838 =item B<Bridges> [I<brname> ...]
5840 List of OVS bridge names to be monitored by this plugin. If this option is
5841 omitted or is empty then all OVS bridges will be monitored.
5843 Default: empty (monitor all bridges)
5847 =head2 Plugin C<perl>
5849 This plugin embeds a Perl-interpreter into collectd and provides an interface
5850 to collectd's plugin system. See L<collectd-perl(5)> for its documentation.
5852 =head2 Plugin C<pinba>
5854 The I<Pinba plugin> receives profiling information from I<Pinba>, an extension
5855 for the I<PHP> interpreter. At the end of executing a script, i.e. after a
5856 PHP-based webpage has been delivered, the extension will send a UDP packet
5857 containing timing information, peak memory usage and so on. The plugin will
5858 wait for such packets, parse them and account the provided information, which
5859 is then dispatched to the daemon once per interval.
5866 # Overall statistics for the website.
5868 Server "www.example.com"
5870 # Statistics for www-a only
5872 Host "www-a.example.com"
5873 Server "www.example.com"
5875 # Statistics for www-b only
5877 Host "www-b.example.com"
5878 Server "www.example.com"
5882 The plugin provides the following configuration options:
5886 =item B<Address> I<Node>
5888 Configures the address used to open a listening socket. By default, plugin will
5889 bind to the I<any> address C<::0>.
5891 =item B<Port> I<Service>
5893 Configures the port (service) to bind to. By default the default Pinba port
5894 "30002" will be used. The option accepts service names in addition to port
5895 numbers and thus requires a I<string> argument.
5897 =item E<lt>B<View> I<Name>E<gt> block
5899 The packets sent by the Pinba extension include the hostname of the server, the
5900 server name (the name of the virtual host) and the script that was executed.
5901 Using B<View> blocks it is possible to separate the data into multiple groups
5902 to get more meaningful statistics. Each packet is added to all matching groups,
5903 so that a packet may be accounted for more than once.
5907 =item B<Host> I<Host>
5909 Matches the hostname of the system the webserver / script is running on. This
5910 will contain the result of the L<gethostname(2)> system call. If not
5911 configured, all hostnames will be accepted.
5913 =item B<Server> I<Server>
5915 Matches the name of the I<virtual host>, i.e. the contents of the
5916 C<$_SERVER["SERVER_NAME"]> variable when within PHP. If not configured, all
5917 server names will be accepted.
5919 =item B<Script> I<Script>
5921 Matches the name of the I<script name>, i.e. the contents of the
5922 C<$_SERVER["SCRIPT_NAME"]> variable when within PHP. If not configured, all
5923 script names will be accepted.
5929 =head2 Plugin C<ping>
5931 The I<Ping> plugin starts a new thread which sends ICMP "ping" packets to the
5932 configured hosts periodically and measures the network latency. Whenever the
5933 C<read> function of the plugin is called, it submits the average latency, the
5934 standard deviation and the drop rate for each host.
5936 Available configuration options:
5940 =item B<Host> I<IP-address>
5942 Host to ping periodically. This option may be repeated several times to ping
5945 =item B<Interval> I<Seconds>
5947 Sets the interval in which to send ICMP echo packets to the configured hosts.
5948 This is B<not> the interval in which statistics are queries from the plugin but
5949 the interval in which the hosts are "pinged". Therefore, the setting here
5950 should be smaller than or equal to the global B<Interval> setting. Fractional
5951 times, such as "1.24" are allowed.
5955 =item B<Timeout> I<Seconds>
5957 Time to wait for a response from the host to which an ICMP packet had been
5958 sent. If a reply was not received after I<Seconds> seconds, the host is assumed
5959 to be down or the packet to be dropped. This setting must be smaller than the
5960 B<Interval> setting above for the plugin to work correctly. Fractional
5961 arguments are accepted.
5965 =item B<TTL> I<0-255>
5967 Sets the Time-To-Live of generated ICMP packets.
5969 =item B<Size> I<size>
5971 Sets the size of the data payload in ICMP packet to specified I<size> (it
5972 will be filled with regular ASCII pattern). If not set, default 56 byte
5973 long string is used so that the packet size of an ICMPv4 packet is exactly
5974 64 bytes, similar to the behaviour of normal ping(1) command.
5976 =item B<SourceAddress> I<host>
5978 Sets the source address to use. I<host> may either be a numerical network
5979 address or a network hostname.
5981 =item B<Device> I<name>
5983 Sets the outgoing network device to be used. I<name> has to specify an
5984 interface name (e.E<nbsp>g. C<eth0>). This might not be supported by all
5987 =item B<MaxMissed> I<Packets>
5989 Trigger a DNS resolve after the host has not replied to I<Packets> packets. This
5990 enables the use of dynamic DNS services (like dyndns.org) with the ping plugin.
5992 Default: B<-1> (disabled)
5996 =head2 Plugin C<postgresql>
5998 The C<postgresql> plugin queries statistics from PostgreSQL databases. It
5999 keeps a persistent connection to all configured databases and tries to
6000 reconnect if the connection has been interrupted. A database is configured by
6001 specifying a B<Database> block as described below. The default statistics are
6002 collected from PostgreSQL's B<statistics collector> which thus has to be
6003 enabled for this plugin to work correctly. This should usually be the case by
6004 default. See the section "The Statistics Collector" of the B<PostgreSQL
6005 Documentation> for details.
6007 By specifying custom database queries using a B<Query> block as described
6008 below, you may collect any data that is available from some PostgreSQL
6009 database. This way, you are able to access statistics of external daemons
6010 which are available in a PostgreSQL database or use future or special
6011 statistics provided by PostgreSQL without the need to upgrade your collectd
6014 Starting with version 5.2, the C<postgresql> plugin supports writing data to
6015 PostgreSQL databases as well. This has been implemented in a generic way. You
6016 need to specify an SQL statement which will then be executed by collectd in
6017 order to write the data (see below for details). The benefit of that approach
6018 is that there is no fixed database layout. Rather, the layout may be optimized
6019 for the current setup.
6021 The B<PostgreSQL Documentation> manual can be found at
6022 L<http://www.postgresql.org/docs/manuals/>.
6026 Statement "SELECT magic FROM wizard WHERE host = $1;"
6030 InstancePrefix "magic"
6035 <Query rt36_tickets>
6036 Statement "SELECT COUNT(type) AS count, type \
6038 WHEN resolved = 'epoch' THEN 'open' \
6039 ELSE 'resolved' END AS type \
6040 FROM tickets) type \
6044 InstancePrefix "rt36_tickets"
6045 InstancesFrom "type"
6051 Statement "SELECT collectd_insert($1, $2, $3, $4, $5, $6, $7, $8, $9);"
6061 KRBSrvName "kerberos_service_name"
6067 Service "service_name"
6068 Query backend # predefined
6079 The B<Query> block defines one database query which may later be used by a
6080 database definition. It accepts a single mandatory argument which specifies
6081 the name of the query. The names of all queries have to be unique (see the
6082 B<MinVersion> and B<MaxVersion> options below for an exception to this
6085 In each B<Query> block, there is one or more B<Result> blocks. Multiple
6086 B<Result> blocks may be used to extract multiple values from a single query.
6088 The following configuration options are available to define the query:
6092 =item B<Statement> I<sql query statement>
6094 Specify the I<sql query statement> which the plugin should execute. The string
6095 may contain the tokens B<$1>, B<$2>, etc. which are used to reference the
6096 first, second, etc. parameter. The value of the parameters is specified by the
6097 B<Param> configuration option - see below for details. To include a literal
6098 B<$> character followed by a number, surround it with single quotes (B<'>).
6100 Any SQL command which may return data (such as C<SELECT> or C<SHOW>) is
6101 allowed. Note, however, that only a single command may be used. Semicolons are
6102 allowed as long as a single non-empty command has been specified only.
6104 The returned lines will be handled separately one after another.
6106 =item B<Param> I<hostname>|I<database>|I<instance>|I<username>|I<interval>
6108 Specify the parameters which should be passed to the SQL query. The parameters
6109 are referred to in the SQL query as B<$1>, B<$2>, etc. in the same order as
6110 they appear in the configuration file. The value of the parameter is
6111 determined depending on the value of the B<Param> option as follows:
6117 The configured hostname of the database connection. If a UNIX domain socket is
6118 used, the parameter expands to "localhost".
6122 The name of the database of the current connection.
6126 The name of the database plugin instance. See the B<Instance> option of the
6127 database specification below for details.
6131 The username used to connect to the database.
6135 The interval with which this database is queried (as specified by the database
6136 specific or global B<Interval> options).
6140 Please note that parameters are only supported by PostgreSQL's protocol
6141 version 3 and above which was introduced in version 7.4 of PostgreSQL.
6143 =item B<PluginInstanceFrom> I<column>
6145 Specify how to create the "PluginInstance" for reporting this query results.
6146 Only one column is supported. You may concatenate fields and string values in
6147 the query statement to get the required results.
6149 =item B<MinVersion> I<version>
6151 =item B<MaxVersion> I<version>
6153 Specify the minimum or maximum version of PostgreSQL that this query should be
6154 used with. Some statistics might only be available with certain versions of
6155 PostgreSQL. This allows you to specify multiple queries with the same name but
6156 which apply to different versions, thus allowing you to use the same
6157 configuration in a heterogeneous environment.
6159 The I<version> has to be specified as the concatenation of the major, minor
6160 and patch-level versions, each represented as two-decimal-digit numbers. For
6161 example, version 8.2.3 will become 80203.
6165 The B<Result> block defines how to handle the values returned from the query.
6166 It defines which column holds which value and how to dispatch that value to
6171 =item B<Type> I<type>
6173 The I<type> name to be used when dispatching the values. The type describes
6174 how to handle the data and where to store it. See L<types.db(5)> for more
6175 details on types and their configuration. The number and type of values (as
6176 selected by the B<ValuesFrom> option) has to match the type of the given name.
6178 This option is mandatory.
6180 =item B<InstancePrefix> I<prefix>
6182 =item B<InstancesFrom> I<column0> [I<column1> ...]
6184 Specify how to create the "TypeInstance" for each data set (i.E<nbsp>e. line).
6185 B<InstancePrefix> defines a static prefix that will be prepended to all type
6186 instances. B<InstancesFrom> defines the column names whose values will be used
6187 to create the type instance. Multiple values will be joined together using the
6188 hyphen (C<->) as separation character.
6190 The plugin itself does not check whether or not all built instances are
6191 different. It is your responsibility to assure that each is unique.
6193 Both options are optional. If none is specified, the type instance will be
6196 =item B<ValuesFrom> I<column0> [I<column1> ...]
6198 Names the columns whose content is used as the actual data for the data sets
6199 that are dispatched to the daemon. How many such columns you need is
6200 determined by the B<Type> setting as explained above. If you specify too many
6201 or not enough columns, the plugin will complain about that and no data will be
6202 submitted to the daemon.
6204 The actual data type, as seen by PostgreSQL, is not that important as long as
6205 it represents numbers. The plugin will automatically cast the values to the
6206 right type if it know how to do that. For that, it uses the L<strtoll(3)> and
6207 L<strtod(3)> functions, so anything supported by those functions is supported
6208 by the plugin as well.
6210 This option is required inside a B<Result> block and may be specified multiple
6211 times. If multiple B<ValuesFrom> options are specified, the columns are read
6216 The following predefined queries are available (the definitions can be found
6217 in the F<postgresql_default.conf> file which, by default, is available at
6218 C<I<prefix>/share/collectd/>):
6224 This query collects the number of backends, i.E<nbsp>e. the number of
6227 =item B<transactions>
6229 This query collects the numbers of committed and rolled-back transactions of
6234 This query collects the numbers of various table modifications (i.E<nbsp>e.
6235 insertions, updates, deletions) of the user tables.
6237 =item B<query_plans>
6239 This query collects the numbers of various table scans and returned tuples of
6242 =item B<table_states>
6244 This query collects the numbers of live and dead rows in the user tables.
6248 This query collects disk block access counts for user tables.
6252 This query collects the on-disk size of the database in bytes.
6256 In addition, the following detailed queries are available by default. Please
6257 note that each of those queries collects information B<by table>, thus,
6258 potentially producing B<a lot> of data. For details see the description of the
6259 non-by_table queries above.
6263 =item B<queries_by_table>
6265 =item B<query_plans_by_table>
6267 =item B<table_states_by_table>
6269 =item B<disk_io_by_table>
6273 The B<Writer> block defines a PostgreSQL writer backend. It accepts a single
6274 mandatory argument specifying the name of the writer. This will then be used
6275 in the B<Database> specification in order to activate the writer instance. The
6276 names of all writers have to be unique. The following options may be
6281 =item B<Statement> I<sql statement>
6283 This mandatory option specifies the SQL statement that will be executed for
6284 each submitted value. A single SQL statement is allowed only. Anything after
6285 the first semicolon will be ignored.
6287 Nine parameters will be passed to the statement and should be specified as
6288 tokens B<$1>, B<$2>, through B<$9> in the statement string. The following
6289 values are made available through those parameters:
6295 The timestamp of the queried value as an RFC 3339-formatted local time.
6299 The hostname of the queried value.
6303 The plugin name of the queried value.
6307 The plugin instance of the queried value. This value may be B<NULL> if there
6308 is no plugin instance.
6312 The type of the queried value (cf. L<types.db(5)>).
6316 The type instance of the queried value. This value may be B<NULL> if there is
6321 An array of names for the submitted values (i.E<nbsp>e., the name of the data
6322 sources of the submitted value-list).
6326 An array of types for the submitted values (i.E<nbsp>e., the type of the data
6327 sources of the submitted value-list; C<counter>, C<gauge>, ...). Note, that if
6328 B<StoreRates> is enabled (which is the default, see below), all types will be
6333 An array of the submitted values. The dimensions of the value name and value
6338 In general, it is advisable to create and call a custom function in the
6339 PostgreSQL database for this purpose. Any procedural language supported by
6340 PostgreSQL will do (see chapter "Server Programming" in the PostgreSQL manual
6343 =item B<StoreRates> B<false>|B<true>
6345 If set to B<true> (the default), convert counter values to rates. If set to
6346 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
6351 The B<Database> block defines one PostgreSQL database for which to collect
6352 statistics. It accepts a single mandatory argument which specifies the
6353 database name. None of the other options are required. PostgreSQL will use
6354 default values as documented in the section "CONNECTING TO A DATABASE" in the
6355 L<psql(1)> manpage. However, be aware that those defaults may be influenced by
6356 the user collectd is run as and special environment variables. See the manpage
6361 =item B<Interval> I<seconds>
6363 Specify the interval with which the database should be queried. The default is
6364 to use the global B<Interval> setting.
6366 =item B<CommitInterval> I<seconds>
6368 This option may be used for database connections which have "writers" assigned
6369 (see above). If specified, it causes a writer to put several updates into a
6370 single transaction. This transaction will last for the specified amount of
6371 time. By default, each update will be executed in a separate transaction. Each
6372 transaction generates a fair amount of overhead which can, thus, be reduced by
6373 activating this option. The draw-back is, that data covering the specified
6374 amount of time will be lost, for example, if a single statement within the
6375 transaction fails or if the database server crashes.
6377 =item B<Instance> I<name>
6379 Specify the plugin instance name that should be used instead of the database
6380 name (which is the default, if this option has not been specified). This
6381 allows one to query multiple databases of the same name on the same host (e.g.
6382 when running multiple database server versions in parallel).
6383 The plugin instance name can also be set from the query result using
6384 the B<PluginInstanceFrom> option in B<Query> block.
6386 =item B<Host> I<hostname>
6388 Specify the hostname or IP of the PostgreSQL server to connect to. If the
6389 value begins with a slash, it is interpreted as the directory name in which to
6390 look for the UNIX domain socket.
6392 This option is also used to determine the hostname that is associated with a
6393 collected data set. If it has been omitted or either begins with with a slash
6394 or equals B<localhost> it will be replaced with the global hostname definition
6395 of collectd. Any other value will be passed literally to collectd when
6396 dispatching values. Also see the global B<Hostname> and B<FQDNLookup> options.
6398 =item B<Port> I<port>
6400 Specify the TCP port or the local UNIX domain socket file extension of the
6403 =item B<User> I<username>
6405 Specify the username to be used when connecting to the server.
6407 =item B<Password> I<password>
6409 Specify the password to be used when connecting to the server.
6411 =item B<ExpireDelay> I<delay>
6413 Skip expired values in query output.
6415 =item B<SSLMode> I<disable>|I<allow>|I<prefer>|I<require>
6417 Specify whether to use an SSL connection when contacting the server. The
6418 following modes are supported:
6424 Do not use SSL at all.
6428 First, try to connect without using SSL. If that fails, try using SSL.
6430 =item I<prefer> (default)
6432 First, try to connect using SSL. If that fails, try without using SSL.
6440 =item B<Instance> I<name>
6442 Specify the plugin instance name that should be used instead of the database
6443 name (which is the default, if this option has not been specified). This
6444 allows one to query multiple databases of the same name on the same host (e.g.
6445 when running multiple database server versions in parallel).
6447 =item B<KRBSrvName> I<kerberos_service_name>
6449 Specify the Kerberos service name to use when authenticating with Kerberos 5
6450 or GSSAPI. See the sections "Kerberos authentication" and "GSSAPI" of the
6451 B<PostgreSQL Documentation> for details.
6453 =item B<Service> I<service_name>
6455 Specify the PostgreSQL service name to use for additional parameters. That
6456 service has to be defined in F<pg_service.conf> and holds additional
6457 connection parameters. See the section "The Connection Service File" in the
6458 B<PostgreSQL Documentation> for details.
6460 =item B<Query> I<query>
6462 Specifies a I<query> which should be executed in the context of the database
6463 connection. This may be any of the predefined or user-defined queries. If no
6464 such option is given, it defaults to "backends", "transactions", "queries",
6465 "query_plans", "table_states", "disk_io" and "disk_usage" (unless a B<Writer>
6466 has been specified). Else, the specified queries are used only.
6468 =item B<Writer> I<writer>
6470 Assigns the specified I<writer> backend to the database connection. This
6471 causes all collected data to be send to the database using the settings
6472 defined in the writer configuration (see the section "FILTER CONFIGURATION"
6473 below for details on how to selectively send data to certain plugins).
6475 Each writer will register a flush callback which may be used when having long
6476 transactions enabled (see the B<CommitInterval> option above). When issuing
6477 the B<FLUSH> command (see L<collectd-unixsock(5)> for details) the current
6478 transaction will be committed right away. Two different kinds of flush
6479 callbacks are available with the C<postgresql> plugin:
6485 Flush all writer backends.
6487 =item B<postgresql->I<database>
6489 Flush all writers of the specified I<database> only.
6495 =head2 Plugin C<powerdns>
6497 The C<powerdns> plugin queries statistics from an authoritative PowerDNS
6498 nameserver and/or a PowerDNS recursor. Since both offer a wide variety of
6499 values, many of which are probably meaningless to most users, but may be useful
6500 for some. So you may chose which values to collect, but if you don't, some
6501 reasonable defaults will be collected.
6504 <Server "server_name">
6506 Collect "udp-answers" "udp-queries"
6507 Socket "/var/run/pdns.controlsocket"
6509 <Recursor "recursor_name">
6511 Collect "cache-hits" "cache-misses"
6512 Socket "/var/run/pdns_recursor.controlsocket"
6514 LocalSocket "/opt/collectd/var/run/collectd-powerdns"
6519 =item B<Server> and B<Recursor> block
6521 The B<Server> block defines one authoritative server to query, the B<Recursor>
6522 does the same for an recursing server. The possible options in both blocks are
6523 the same, though. The argument defines a name for the serverE<nbsp>/ recursor
6528 =item B<Collect> I<Field>
6530 Using the B<Collect> statement you can select which values to collect. Here,
6531 you specify the name of the values as used by the PowerDNS servers, e.E<nbsp>g.
6532 C<dlg-only-drops>, C<answers10-100>.
6534 The method of getting the values differs for B<Server> and B<Recursor> blocks:
6535 When querying the server a C<SHOW *> command is issued in any case, because
6536 that's the only way of getting multiple values out of the server at once.
6537 collectd then picks out the values you have selected. When querying the
6538 recursor, a command is generated to query exactly these values. So if you
6539 specify invalid fields when querying the recursor, a syntax error may be
6540 returned by the daemon and collectd may not collect any values at all.
6542 If no B<Collect> statement is given, the following B<Server> values will be
6549 =item packetcache-hit
6551 =item packetcache-miss
6553 =item packetcache-size
6555 =item query-cache-hit
6557 =item query-cache-miss
6559 =item recursing-answers
6561 =item recursing-questions
6573 The following B<Recursor> values will be collected by default:
6577 =item noerror-answers
6579 =item nxdomain-answers
6581 =item servfail-answers
6599 Please note that up to that point collectd doesn't know what values are
6600 available on the server and values that are added do not need a change of the
6601 mechanism so far. However, the values must be mapped to collectd's naming
6602 scheme, which is done using a lookup table that lists all known values. If
6603 values are added in the future and collectd does not know about them, you will
6604 get an error much like this:
6606 powerdns plugin: submit: Not found in lookup table: foobar = 42
6608 In this case please file a bug report with the collectd team.
6610 =item B<Socket> I<Path>
6612 Configures the path to the UNIX domain socket to be used when connecting to the
6613 daemon. By default C<${localstatedir}/run/pdns.controlsocket> will be used for
6614 an authoritative server and C<${localstatedir}/run/pdns_recursor.controlsocket>
6615 will be used for the recursor.
6619 =item B<LocalSocket> I<Path>
6621 Querying the recursor is done using UDP. When using UDP over UNIX domain
6622 sockets, the client socket needs a name in the file system, too. You can set
6623 this local name to I<Path> using the B<LocalSocket> option. The default is
6624 C<I<prefix>/var/run/collectd-powerdns>.
6628 =head2 Plugin C<processes>
6632 =item B<Process> I<Name>
6634 Select more detailed statistics of processes matching this name. The statistics
6635 collected for these selected processes are:
6636 - size of the resident segment size (RSS)
6637 - user- and system-time used
6638 - number of processes
6640 - number of open files (under Linux)
6641 - io data (where available)
6642 - context switches (under Linux)
6643 - minor and major pagefaults.
6645 Some platforms have a limit on the length of process names. I<Name> must stay
6648 =item B<ProcessMatch> I<name> I<regex>
6650 Similar to the B<Process> option this allows one to select more detailed
6651 statistics of processes matching the specified I<regex> (see L<regex(7)> for
6652 details). The statistics of all matching processes are summed up and
6653 dispatched to the daemon using the specified I<name> as an identifier. This
6654 allows one to "group" several processes together. I<name> must not contain
6657 =item B<CollectContextSwitch> I<Boolean>
6659 Collect context switch of the process.
6663 =head2 Plugin C<protocols>
6665 Collects a lot of information about various network protocols, such as I<IP>,
6666 I<TCP>, I<UDP>, etc.
6668 Available configuration options:
6672 =item B<Value> I<Selector>
6674 Selects whether or not to select a specific value. The string being matched is
6675 of the form "I<Protocol>:I<ValueName>", where I<Protocol> will be used as the
6676 plugin instance and I<ValueName> will be used as type instance. An example of
6677 the string being used would be C<Tcp:RetransSegs>.
6679 You can use regular expressions to match a large number of values with just one
6680 configuration option. To select all "extended" I<TCP> values, you could use the
6681 following statement:
6685 Whether only matched values are selected or all matched values are ignored
6686 depends on the B<IgnoreSelected>. By default, only matched values are selected.
6687 If no value is configured at all, all values will be selected.
6689 See F</"IGNORELISTS"> for details.
6691 =item B<IgnoreSelected> B<true>|B<false>
6693 If set to B<true>, inverts the selection made by B<Value>, i.E<nbsp>e. all
6694 matching values will be ignored.
6698 =head2 Plugin C<python>
6700 This plugin embeds a Python-interpreter into collectd and provides an interface
6701 to collectd's plugin system. See L<collectd-python(5)> for its documentation.
6703 =head2 Plugin C<routeros>
6705 The C<routeros> plugin connects to a device running I<RouterOS>, the
6706 Linux-based operating system for routers by I<MikroTik>. The plugin uses
6707 I<librouteros> to connect and reads information about the interfaces and
6708 wireless connections of the device. The configuration supports querying
6713 Host "router0.example.com"
6716 CollectInterface true
6721 Host "router1.example.com"
6724 CollectInterface true
6725 CollectRegistrationTable true
6731 As you can see above, the configuration of the I<routeros> plugin consists of
6732 one or more B<E<lt>RouterE<gt>> blocks. Within each block, the following
6733 options are understood:
6737 =item B<Host> I<Host>
6739 Hostname or IP-address of the router to connect to.
6741 =item B<Port> I<Port>
6743 Port name or port number used when connecting. If left unspecified, the default
6744 will be chosen by I<librouteros>, currently "8728". This option expects a
6745 string argument, even when a numeric port number is given.
6747 =item B<User> I<User>
6749 Use the user name I<User> to authenticate. Defaults to "admin".
6751 =item B<Password> I<Password>
6753 Set the password used to authenticate.
6755 =item B<CollectInterface> B<true>|B<false>
6757 When set to B<true>, interface statistics will be collected for all interfaces
6758 present on the device. Defaults to B<false>.
6760 =item B<CollectRegistrationTable> B<true>|B<false>
6762 When set to B<true>, information about wireless LAN connections will be
6763 collected. Defaults to B<false>.
6765 =item B<CollectCPULoad> B<true>|B<false>
6767 When set to B<true>, information about the CPU usage will be collected. The
6768 number is a dimensionless value where zero indicates no CPU usage at all.
6769 Defaults to B<false>.
6771 =item B<CollectMemory> B<true>|B<false>
6773 When enabled, the amount of used and free memory will be collected. How used
6774 memory is calculated is unknown, for example whether or not caches are counted
6776 Defaults to B<false>.
6778 =item B<CollectDF> B<true>|B<false>
6780 When enabled, the amount of used and free disk space will be collected.
6781 Defaults to B<false>.
6783 =item B<CollectDisk> B<true>|B<false>
6785 When enabled, the number of sectors written and bad blocks will be collected.
6786 Defaults to B<false>.
6790 =head2 Plugin C<redis>
6792 The I<Redis plugin> connects to one or more Redis servers and gathers
6793 information about each server's state. For each server there is a I<Node> block
6794 which configures the connection parameters for this node.
6801 <Query "LLEN myqueue">
6808 The information shown in the synopsis above is the I<default configuration>
6809 which is used by the plugin if no configuration is present.
6813 =item B<Node> I<Nodename>
6815 The B<Node> block identifies a new Redis node, that is a new Redis instance
6816 running in an specified host and port. The name for node is a canonical
6817 identifier which is used as I<plugin instance>. It is limited to
6818 64E<nbsp>characters in length.
6820 =item B<Host> I<Hostname>
6822 The B<Host> option is the hostname or IP-address where the Redis instance is
6825 =item B<Port> I<Port>
6827 The B<Port> option is the TCP port on which the Redis instance accepts
6828 connections. Either a service name of a port number may be given. Please note
6829 that numerical port numbers must be given as a string, too.
6831 =item B<Password> I<Password>
6833 Use I<Password> to authenticate when connecting to I<Redis>.
6835 =item B<Timeout> I<Milliseconds>
6837 The B<Timeout> option set the socket timeout for node response. Since the Redis
6838 read function is blocking, you should keep this value as low as possible. Keep
6839 in mind that the sum of all B<Timeout> values for all B<Nodes> should be lower
6840 than B<Interval> defined globally.
6842 =item B<Query> I<Querystring>
6844 The B<Query> block identifies a query to execute against the redis server.
6845 There may be an arbitrary number of queries to execute.
6847 =item B<Type> I<Collectd type>
6849 Within a query definition, a valid collectd type to use as when submitting
6850 the result of the query. When not supplied, will default to B<gauge>.
6852 =item B<Instance> I<Type instance>
6854 Within a query definition, an optional type instance to use when submitting
6855 the result of the query. When not supplied will default to the escaped
6856 command, up to 64 chars.
6860 =head2 Plugin C<rrdcached>
6862 The C<rrdcached> plugin uses the RRDtool accelerator daemon, L<rrdcached(1)>,
6863 to store values to RRD files in an efficient manner. The combination of the
6864 C<rrdcached> B<plugin> and the C<rrdcached> B<daemon> is very similar to the
6865 way the C<rrdtool> plugin works (see below). The added abstraction layer
6866 provides a number of benefits, though: Because the cache is not within
6867 C<collectd> anymore, it does not need to be flushed when C<collectd> is to be
6868 restarted. This results in much shorter (if any) gaps in graphs, especially
6869 under heavy load. Also, the C<rrdtool> command line utility is aware of the
6870 daemon so that it can flush values to disk automatically when needed. This
6871 allows one to integrate automated flushing of values into graphing solutions
6874 There are disadvantages, though: The daemon may reside on a different host, so
6875 it may not be possible for C<collectd> to create the appropriate RRD files
6876 anymore. And even if C<rrdcached> runs on the same host, it may run in a
6877 different base directory, so relative paths may do weird stuff if you're not
6880 So the B<recommended configuration> is to let C<collectd> and C<rrdcached> run
6881 on the same host, communicating via a UNIX domain socket. The B<DataDir>
6882 setting should be set to an absolute path, so that a changed base directory
6883 does not result in RRD files being createdE<nbsp>/ expected in the wrong place.
6887 =item B<DaemonAddress> I<Address>
6889 Address of the daemon as understood by the C<rrdc_connect> function of the RRD
6890 library. See L<rrdcached(1)> for details. Example:
6892 <Plugin "rrdcached">
6893 DaemonAddress "unix:/var/run/rrdcached.sock"
6896 =item B<DataDir> I<Directory>
6898 Set the base directory in which the RRD files reside. If this is a relative
6899 path, it is relative to the working base directory of the C<rrdcached> daemon!
6900 Use of an absolute path is recommended.
6902 =item B<CreateFiles> B<true>|B<false>
6904 Enables or disables the creation of RRD files. If the daemon is not running
6905 locally, or B<DataDir> is set to a relative path, this will not work as
6906 expected. Default is B<true>.
6908 =item B<CreateFilesAsync> B<false>|B<true>
6910 When enabled, new RRD files are enabled asynchronously, using a separate thread
6911 that runs in the background. This prevents writes to block, which is a problem
6912 especially when many hundreds of files need to be created at once. However,
6913 since the purpose of creating the files asynchronously is I<not> to block until
6914 the file is available, values before the file is available will be discarded.
6915 When disabled (the default) files are created synchronously, blocking for a
6916 short while, while the file is being written.
6918 =item B<StepSize> I<Seconds>
6920 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
6921 this setting is unset and the stepsize is set to the interval in which the data
6922 is collected. Do not use this option unless you absolutely have to for some
6923 reason. Setting this option may cause problems with the C<snmp plugin>, the
6924 C<exec plugin> or when the daemon is set up to receive data from other hosts.
6926 =item B<HeartBeat> I<Seconds>
6928 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
6929 in which case the heartbeat is set to twice the B<StepSize> which should equal
6930 the interval in which data is collected. Do not set this option unless you have
6931 a very good reason to do so.
6933 =item B<RRARows> I<NumRows>
6935 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
6936 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
6937 three times five RRAs, i. e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
6938 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
6939 week, one month, and one year.
6941 So for each timespan, it calculates how many PDPs need to be consolidated into
6942 one CDP by calculating:
6943 number of PDPs = timespan / (stepsize * rrarows)
6945 Bottom line is, set this no smaller than the width of you graphs in pixels. The
6948 =item B<RRATimespan> I<Seconds>
6950 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
6951 more then one RRA. If this option is never used, the built-in default of (3600,
6952 86400, 604800, 2678400, 31622400) is used.
6954 For more information on how RRA-sizes are calculated see B<RRARows> above.
6956 =item B<XFF> I<Factor>
6958 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
6959 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
6962 =item B<CollectStatistics> B<false>|B<true>
6964 When set to B<true>, various statistics about the I<rrdcached> daemon will be
6965 collected, with "rrdcached" as the I<plugin name>. Defaults to B<false>.
6967 Statistics are read via I<rrdcached>s socket using the STATS command.
6968 See L<rrdcached(1)> for details.
6972 =head2 Plugin C<rrdtool>
6974 You can use the settings B<StepSize>, B<HeartBeat>, B<RRARows>, and B<XFF> to
6975 fine-tune your RRD-files. Please read L<rrdcreate(1)> if you encounter problems
6976 using these settings. If you don't want to dive into the depths of RRDtool, you
6977 can safely ignore these settings.
6981 =item B<DataDir> I<Directory>
6983 Set the directory to store RRD files under. By default RRD files are generated
6984 beneath the daemon's working directory, i.e. the B<BaseDir>.
6986 =item B<CreateFilesAsync> B<false>|B<true>
6988 When enabled, new RRD files are enabled asynchronously, using a separate thread
6989 that runs in the background. This prevents writes to block, which is a problem
6990 especially when many hundreds of files need to be created at once. However,
6991 since the purpose of creating the files asynchronously is I<not> to block until
6992 the file is available, values before the file is available will be discarded.
6993 When disabled (the default) files are created synchronously, blocking for a
6994 short while, while the file is being written.
6996 =item B<StepSize> I<Seconds>
6998 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
6999 this setting is unset and the stepsize is set to the interval in which the data
7000 is collected. Do not use this option unless you absolutely have to for some
7001 reason. Setting this option may cause problems with the C<snmp plugin>, the
7002 C<exec plugin> or when the daemon is set up to receive data from other hosts.
7004 =item B<HeartBeat> I<Seconds>
7006 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
7007 in which case the heartbeat is set to twice the B<StepSize> which should equal
7008 the interval in which data is collected. Do not set this option unless you have
7009 a very good reason to do so.
7011 =item B<RRARows> I<NumRows>
7013 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
7014 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
7015 three times five RRAs, i.e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
7016 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
7017 week, one month, and one year.
7019 So for each timespan, it calculates how many PDPs need to be consolidated into
7020 one CDP by calculating:
7021 number of PDPs = timespan / (stepsize * rrarows)
7023 Bottom line is, set this no smaller than the width of you graphs in pixels. The
7026 =item B<RRATimespan> I<Seconds>
7028 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
7029 more then one RRA. If this option is never used, the built-in default of (3600,
7030 86400, 604800, 2678400, 31622400) is used.
7032 For more information on how RRA-sizes are calculated see B<RRARows> above.
7034 =item B<XFF> I<Factor>
7036 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
7037 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
7040 =item B<CacheFlush> I<Seconds>
7042 When the C<rrdtool> plugin uses a cache (by setting B<CacheTimeout>, see below)
7043 it writes all values for a certain RRD-file if the oldest value is older than
7044 (or equal to) the number of seconds specified. If some RRD-file is not updated
7045 anymore for some reason (the computer was shut down, the network is broken,
7046 etc.) some values may still be in the cache. If B<CacheFlush> is set, then the
7047 entire cache is searched for entries older than B<CacheTimeout> seconds and
7048 written to disk every I<Seconds> seconds. Since this is kind of expensive and
7049 does nothing under normal circumstances, this value should not be too small.
7050 900 seconds might be a good value, though setting this to 7200 seconds doesn't
7051 normally do much harm either.
7053 =item B<CacheTimeout> I<Seconds>
7055 If this option is set to a value greater than zero, the C<rrdtool plugin> will
7056 save values in a cache, as described above. Writing multiple values at once
7057 reduces IO-operations and thus lessens the load produced by updating the files.
7058 The trade off is that the graphs kind of "drag behind" and that more memory is
7061 =item B<WritesPerSecond> I<Updates>
7063 When collecting many statistics with collectd and the C<rrdtool> plugin, you
7064 will run serious performance problems. The B<CacheFlush> setting and the
7065 internal update queue assert that collectd continues to work just fine even
7066 under heavy load, but the system may become very unresponsive and slow. This is
7067 a problem especially if you create graphs from the RRD files on the same
7068 machine, for example using the C<graph.cgi> script included in the
7069 C<contrib/collection3/> directory.
7071 This setting is designed for very large setups. Setting this option to a value
7072 between 25 and 80 updates per second, depending on your hardware, will leave
7073 the server responsive enough to draw graphs even while all the cached values
7074 are written to disk. Flushed values, i.E<nbsp>e. values that are forced to disk
7075 by the B<FLUSH> command, are B<not> effected by this limit. They are still
7076 written as fast as possible, so that web frontends have up to date data when
7079 For example: If you have 100,000 RRD files and set B<WritesPerSecond> to 30
7080 updates per second, writing all values to disk will take approximately
7081 56E<nbsp>minutes. Together with the flushing ability that's integrated into
7082 "collection3" you'll end up with a responsive and fast system, up to date
7083 graphs and basically a "backup" of your values every hour.
7085 =item B<RandomTimeout> I<Seconds>
7087 When set, the actual timeout for each value is chosen randomly between
7088 I<CacheTimeout>-I<RandomTimeout> and I<CacheTimeout>+I<RandomTimeout>. The
7089 intention is to avoid high load situations that appear when many values timeout
7090 at the same time. This is especially a problem shortly after the daemon starts,
7091 because all values were added to the internal cache at roughly the same time.
7095 =head2 Plugin C<sensors>
7097 The I<Sensors plugin> uses B<lm_sensors> to retrieve sensor-values. This means
7098 that all the needed modules have to be loaded and lm_sensors has to be
7099 configured (most likely by editing F</etc/sensors.conf>. Read
7100 L<sensors.conf(5)> for details.
7102 The B<lm_sensors> homepage can be found at
7103 L<http://secure.netroedge.com/~lm78/>.
7107 =item B<SensorConfigFile> I<File>
7109 Read the I<lm_sensors> configuration from I<File>. When unset (recommended),
7110 the library's default will be used.
7112 =item B<Sensor> I<chip-bus-address/type-feature>
7114 Selects the name of the sensor which you want to collect or ignore, depending
7115 on the B<IgnoreSelected> below. For example, the option "B<Sensor>
7116 I<it8712-isa-0290/voltage-in1>" will cause collectd to gather data for the
7117 voltage sensor I<in1> of the I<it8712> on the isa bus at the address 0290.
7119 See F</"IGNORELISTS"> for details.
7121 =item B<IgnoreSelected> I<true>|I<false>
7123 If no configuration if given, the B<sensors>-plugin will collect data from all
7124 sensors. This may not be practical, especially for uninteresting sensors.
7125 Thus, you can use the B<Sensor>-option to pick the sensors you're interested
7126 in. Sometimes, however, it's easier/preferred to collect all sensors I<except> a
7127 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
7128 I<true> the effect of B<Sensor> is inverted: All selected sensors are ignored
7129 and all other sensors are collected.
7131 =item B<UseLabels> I<true>|I<false>
7133 Configures how sensor readings are reported. When set to I<true>, sensor
7134 readings are reported using their descriptive label (e.g. "VCore"). When set to
7135 I<false> (the default) the sensor name is used ("in0").
7139 =head2 Plugin C<sigrok>
7141 The I<sigrok plugin> uses I<libsigrok> to retrieve measurements from any device
7142 supported by the L<sigrok|http://sigrok.org/> project.
7148 <Device "AC Voltage">
7153 <Device "Sound Level">
7154 Driver "cem-dt-885x"
7161 =item B<LogLevel> B<0-5>
7163 The I<sigrok> logging level to pass on to the I<collectd> log, as a number
7164 between B<0> and B<5> (inclusive). These levels correspond to C<None>,
7165 C<Errors>, C<Warnings>, C<Informational>, C<Debug >and C<Spew>, respectively.
7166 The default is B<2> (C<Warnings>). The I<sigrok> log messages, regardless of
7167 their level, are always submitted to I<collectd> at its INFO log level.
7169 =item E<lt>B<Device> I<Name>E<gt>
7171 A sigrok-supported device, uniquely identified by this section's options. The
7172 I<Name> is passed to I<collectd> as the I<plugin instance>.
7174 =item B<Driver> I<DriverName>
7176 The sigrok driver to use for this device.
7178 =item B<Conn> I<ConnectionSpec>
7180 If the device cannot be auto-discovered, or more than one might be discovered
7181 by the driver, I<ConnectionSpec> specifies the connection string to the device.
7182 It can be of the form of a device path (e.g.E<nbsp>C</dev/ttyUSB2>), or, in
7183 case of a non-serial USB-connected device, the USB I<VendorID>B<.>I<ProductID>
7184 separated by a period (e.g.E<nbsp>C<0403.6001>). A USB device can also be
7185 specified as I<Bus>B<.>I<Address> (e.g.E<nbsp>C<1.41>).
7187 =item B<SerialComm> I<SerialSpec>
7189 For serial devices with non-standard port settings, this option can be used
7190 to specify them in a form understood by I<sigrok>, e.g.E<nbsp>C<9600/8n1>.
7191 This should not be necessary; drivers know how to communicate with devices they
7194 =item B<MinimumInterval> I<Seconds>
7196 Specifies the minimum time between measurement dispatches to I<collectd>, in
7197 seconds. Since some I<sigrok> supported devices can acquire measurements many
7198 times per second, it may be necessary to throttle these. For example, the
7199 I<RRD plugin> cannot process writes more than once per second.
7201 The default B<MinimumInterval> is B<0>, meaning measurements received from the
7202 device are always dispatched to I<collectd>. When throttled, unused
7203 measurements are discarded.
7207 =head2 Plugin C<smart>
7209 The C<smart> plugin collects SMART information from physical
7210 disks. Values collectd include temperature, power cycle count, poweron
7211 time and bad sectors. Also, all SMART attributes are collected along
7212 with the normalized current value, the worst value, the threshold and
7213 a human readable value.
7215 Using the following two options you can ignore some disks or configure the
7216 collection only of specific disks.
7220 =item B<Disk> I<Name>
7222 Select the disk I<Name>. Whether it is collected or ignored depends on the
7223 B<IgnoreSelected> setting, see below. As with other plugins that use the
7224 daemon's ignorelist functionality, a string that starts and ends with a slash
7225 is interpreted as a regular expression. Examples:
7230 See F</"IGNORELISTS"> for details.
7232 =item B<IgnoreSelected> B<true>|B<false>
7234 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
7235 statements, are ignored or if all other disks are ignored. The behavior
7236 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
7237 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
7238 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
7239 is set to B<true>, all disks are collected B<except> the ones matched.
7241 =item B<IgnoreSleepMode> B<true>|B<false>
7243 Normally, the C<smart> plugin will ignore disks that are reported to be asleep.
7244 This option disables the sleep mode check and allows the plugin to collect data
7245 from these disks anyway. This is useful in cases where libatasmart mistakenly
7246 reports disks as asleep because it has not been updated to incorporate support
7247 for newer idle states in the ATA spec.
7249 =item B<UseSerial> B<true>|B<false>
7251 A disk's kernel name (e.g., sda) can change from one boot to the next. If this
7252 option is enabled, the C<smart> plugin will use the disk's serial number (e.g.,
7253 HGST_HUH728080ALE600_2EJ8VH8X) instead of the kernel name as the key for
7254 storing data. This ensures that the data for a given disk will be kept together
7255 even if the kernel name changes.
7259 =head2 Plugin C<snmp>
7261 Since the configuration of the C<snmp plugin> is a little more complicated than
7262 other plugins, its documentation has been moved to an own manpage,
7263 L<collectd-snmp(5)>. Please see there for details.
7265 =head2 Plugin C<statsd>
7267 The I<statsd plugin> listens to a UDP socket, reads "events" in the statsd
7268 protocol and dispatches rates or other aggregates of these numbers
7271 The plugin implements the I<Counter>, I<Timer>, I<Gauge> and I<Set> types which
7272 are dispatched as the I<collectd> types C<derive>, C<latency>, C<gauge> and
7273 C<objects> respectively.
7275 The following configuration options are valid:
7279 =item B<Host> I<Host>
7281 Bind to the hostname / address I<Host>. By default, the plugin will bind to the
7282 "any" address, i.e. accept packets sent to any of the hosts addresses.
7284 =item B<Port> I<Port>
7286 UDP port to listen to. This can be either a service name or a port number.
7287 Defaults to C<8125>.
7289 =item B<DeleteCounters> B<false>|B<true>
7291 =item B<DeleteTimers> B<false>|B<true>
7293 =item B<DeleteGauges> B<false>|B<true>
7295 =item B<DeleteSets> B<false>|B<true>
7297 These options control what happens if metrics are not updated in an interval.
7298 If set to B<False>, the default, metrics are dispatched unchanged, i.e. the
7299 rate of counters and size of sets will be zero, timers report C<NaN> and gauges
7300 are unchanged. If set to B<True>, the such metrics are not dispatched and
7301 removed from the internal cache.
7303 =item B<CounterSum> B<false>|B<true>
7305 When enabled, creates a C<count> metric which reports the change since the last
7306 read. This option primarily exists for compatibility with the I<statsd>
7307 implementation by Etsy.
7309 =item B<TimerPercentile> I<Percent>
7311 Calculate and dispatch the configured percentile, i.e. compute the latency, so
7312 that I<Percent> of all reported timers are smaller than or equal to the
7313 computed latency. This is useful for cutting off the long tail latency, as it's
7314 often done in I<Service Level Agreements> (SLAs).
7316 Different percentiles can be calculated by setting this option several times.
7317 If none are specified, no percentiles are calculated / dispatched.
7319 =item B<TimerLower> B<false>|B<true>
7321 =item B<TimerUpper> B<false>|B<true>
7323 =item B<TimerSum> B<false>|B<true>
7325 =item B<TimerCount> B<false>|B<true>
7327 Calculate and dispatch various values out of I<Timer> metrics received during
7328 an interval. If set to B<False>, the default, these values aren't calculated /
7333 =head2 Plugin C<swap>
7335 The I<Swap plugin> collects information about used and available swap space. On
7336 I<Linux> and I<Solaris>, the following options are available:
7340 =item B<ReportByDevice> B<false>|B<true>
7342 Configures how to report physical swap devices. If set to B<false> (the
7343 default), the summary over all swap devices is reported only, i.e. the globally
7344 used and available space over all devices. If B<true> is configured, the used
7345 and available space of each device will be reported separately.
7347 This option is only available if the I<Swap plugin> can read C</proc/swaps>
7348 (under Linux) or use the L<swapctl(2)> mechanism (under I<Solaris>).
7350 =item B<ReportBytes> B<false>|B<true>
7352 When enabled, the I<swap I/O> is reported in bytes. When disabled, the default,
7353 I<swap I/O> is reported in pages. This option is available under Linux only.
7355 =item B<ValuesAbsolute> B<true>|B<false>
7357 Enables or disables reporting of absolute swap metrics, i.e. number of I<bytes>
7358 available and used. Defaults to B<true>.
7360 =item B<ValuesPercentage> B<false>|B<true>
7362 Enables or disables reporting of relative swap metrics, i.e. I<percent>
7363 available and free. Defaults to B<false>.
7365 This is useful for deploying I<collectd> in a heterogeneous environment, where
7366 swap sizes differ and you want to specify generic thresholds or similar.
7370 =head2 Plugin C<syslog>
7374 =item B<LogLevel> B<debug|info|notice|warning|err>
7376 Sets the log-level. If, for example, set to B<notice>, then all events with
7377 severity B<notice>, B<warning>, or B<err> will be submitted to the
7380 Please note that B<debug> is only available if collectd has been compiled with
7383 =item B<NotifyLevel> B<OKAY>|B<WARNING>|B<FAILURE>
7385 Controls which notifications should be sent to syslog. The default behaviour is
7386 not to send any. Less severe notifications always imply logging more severe
7387 notifications: Setting this to B<OKAY> means all notifications will be sent to
7388 syslog, setting this to B<WARNING> will send B<WARNING> and B<FAILURE>
7389 notifications but will dismiss B<OKAY> notifications. Setting this option to
7390 B<FAILURE> will only send failures to syslog.
7394 =head2 Plugin C<table>
7396 The C<table plugin> provides generic means to parse tabular data and dispatch
7397 user specified values. Values are selected based on column numbers. For
7398 example, this plugin may be used to get values from the Linux L<proc(5)>
7399 filesystem or CSV (comma separated values) files.
7402 <Table "/proc/slabinfo">
7407 InstancePrefix "active_objs"
7413 InstancePrefix "objperslab"
7420 The configuration consists of one or more B<Table> blocks, each of which
7421 configures one file to parse. Within each B<Table> block, there are one or
7422 more B<Result> blocks, which configure which data to select and how to
7425 The following options are available inside a B<Table> block:
7429 =item B<Instance> I<instance>
7431 If specified, I<instance> is used as the plugin instance. So, in the above
7432 example, the plugin name C<table-slabinfo> would be used. If omitted, the
7433 filename of the table is used instead, with all special characters replaced
7434 with an underscore (C<_>).
7436 =item B<Separator> I<string>
7438 Any character of I<string> is interpreted as a delimiter between the different
7439 columns of the table. A sequence of two or more contiguous delimiters in the
7440 table is considered to be a single delimiter, i.E<nbsp>e. there cannot be any
7441 empty columns. The plugin uses the L<strtok_r(3)> function to parse the lines
7442 of a table - see its documentation for more details. This option is mandatory.
7444 A horizontal tab, newline and carriage return may be specified by C<\\t>,
7445 C<\\n> and C<\\r> respectively. Please note that the double backslashes are
7446 required because of collectd's config parsing.
7450 The following options are available inside a B<Result> block:
7454 =item B<Type> I<type>
7456 Sets the type used to dispatch the values to the daemon. Detailed information
7457 about types and their configuration can be found in L<types.db(5)>. This
7458 option is mandatory.
7460 =item B<InstancePrefix> I<prefix>
7462 If specified, prepend I<prefix> to the type instance. If omitted, only the
7463 B<InstancesFrom> option is considered for the type instance.
7465 =item B<InstancesFrom> I<column0> [I<column1> ...]
7467 If specified, the content of the given columns (identified by the column
7468 number starting at zero) will be used to create the type instance for each
7469 row. Multiple values (and the instance prefix) will be joined together with
7470 dashes (I<->) as separation character. If omitted, only the B<InstancePrefix>
7471 option is considered for the type instance.
7473 The plugin itself does not check whether or not all built instances are
7474 different. It’s your responsibility to assure that each is unique. This is
7475 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
7476 sure that the table only contains one row.
7478 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type instance
7481 =item B<ValuesFrom> I<column0> [I<column1> ...]
7483 Specifies the columns (identified by the column numbers starting at zero)
7484 whose content is used as the actual data for the data sets that are dispatched
7485 to the daemon. How many such columns you need is determined by the B<Type>
7486 setting above. If you specify too many or not enough columns, the plugin will
7487 complain about that and no data will be submitted to the daemon. The plugin
7488 uses L<strtoll(3)> and L<strtod(3)> to parse counter and gauge values
7489 respectively, so anything supported by those functions is supported by the
7490 plugin as well. This option is mandatory.
7494 =head2 Plugin C<tail>
7496 The C<tail plugin> follows logfiles, just like L<tail(1)> does, parses
7497 each line and dispatches found values. What is matched can be configured by the
7498 user using (extended) regular expressions, as described in L<regex(7)>.
7501 <File "/var/log/exim4/mainlog">
7505 Regex "S=([1-9][0-9]*)"
7511 Regex "\\<R=local_user\\>"
7512 ExcludeRegex "\\<R=local_user\\>.*mail_spool defer"
7515 Instance "local_user"
7518 Regex "l=([0-9]*\\.[0-9]*)"
7519 <DSType "Distribution">
7529 The config consists of one or more B<File> blocks, each of which configures one
7530 logfile to parse. Within each B<File> block, there are one or more B<Match>
7531 blocks, which configure a regular expression to search for.
7533 The B<Instance> option in the B<File> block may be used to set the plugin
7534 instance. So in the above example the plugin name C<tail-foo> would be used.
7535 This plugin instance is for all B<Match> blocks that B<follow> it, until the
7536 next B<Instance> option. This way you can extract several plugin instances from
7537 one logfile, handy when parsing syslog and the like.
7539 The B<Interval> option allows you to define the length of time between reads. If
7540 this is not set, the default Interval will be used.
7542 Each B<Match> block has the following options to describe how the match should
7547 =item B<Regex> I<regex>
7549 Sets the regular expression to use for matching against a line. The first
7550 subexpression has to match something that can be turned into a number by
7551 L<strtoll(3)> or L<strtod(3)>, depending on the value of C<CounterAdd>, see
7552 below. Because B<extended> regular expressions are used, you do not need to use
7553 backslashes for subexpressions! If in doubt, please consult L<regex(7)>. Due to
7554 collectd's config parsing you need to escape backslashes, though. So if you
7555 want to match literal parentheses you need to do the following:
7557 Regex "SPAM \\(Score: (-?[0-9]+\\.[0-9]+)\\)"
7559 =item B<ExcludeRegex> I<regex>
7561 Sets an optional regular expression to use for excluding lines from the match.
7562 An example which excludes all connections from localhost from the match:
7564 ExcludeRegex "127\\.0\\.0\\.1"
7566 =item B<DSType> I<Type>
7568 Sets how the values are cumulated. I<Type> is one of:
7572 =item B<GaugeAverage>
7574 Calculate the average.
7578 Use the smallest number only.
7582 Use the greatest number only.
7586 Use the last number found.
7588 =item B<GaugePersist>
7590 Use the last number found. The number is not reset at the end of an interval.
7591 It is continously reported until another number is matched. This is intended
7592 for cases in which only state changes are reported, for example a thermometer
7593 that only reports the temperature when it changes.
7599 =item B<AbsoluteSet>
7601 The matched number is a counter. Simply I<sets> the internal counter to this
7602 value. Variants exist for C<COUNTER>, C<DERIVE>, and C<ABSOLUTE> data sources.
7610 Add the matched value to the internal counter. In case of B<DeriveAdd>, the
7611 matched number may be negative, which will effectively subtract from the
7620 Increase the internal counter by one. These B<DSType> are the only ones that do
7621 not use the matched subexpression, but simply count the number of matched
7622 lines. Thus, you may use a regular expression without submatch in this case.
7624 =item B<Distribution>
7626 Type to do calculations based on the distribution of values, primarily
7627 calculating percentiles. This is primarily geared towards latency, but can be
7628 used for other metrics as well. The range of values tracked with this setting
7629 must be in the range (0–2^34) and can be fractional. Please note that neither
7630 zero nor 2^34 are inclusive bounds, i.e. zero I<cannot> be handled by a
7633 This option must be used together with the B<Percentile> and/or B<Bucket>
7638 <DSType "Distribution">
7645 =item B<Percentile> I<Percent>
7647 Calculate and dispatch the configured percentile, i.e. compute the value, so
7648 that I<Percent> of all matched values are smaller than or equal to the computed
7651 Metrics are reported with the I<type> B<Type> (the value of the above option)
7652 and the I<type instance> C<[E<lt>InstanceE<gt>-]E<lt>PercentE<gt>>.
7654 This option may be repeated to calculate more than one percentile.
7656 =item B<Bucket> I<lower_bound> I<upper_bound>
7658 Export the number of values (a C<DERIVE>) falling within the given range. Both,
7659 I<lower_bound> and I<upper_bound> may be a fractional number, such as B<0.5>.
7660 Each B<Bucket> option specifies an interval C<(I<lower_bound>,
7661 I<upper_bound>]>, i.e. the range I<excludes> the lower bound and I<includes>
7662 the upper bound. I<lower_bound> and I<upper_bound> may be zero, meaning no
7665 To export the entire (0–inf) range without overlap, use the upper bound of the
7666 previous range as the lower bound of the following range. In other words, use
7667 the following schema:
7677 Metrics are reported with the I<type> C<bucket> and the I<type instance>
7678 C<E<lt>TypeE<gt>[-E<lt>InstanceE<gt>]-E<lt>lower_boundE<gt>_E<lt>upper_boundE<gt>>.
7680 This option may be repeated to calculate more than one rate.
7686 The B<Gauge*> and B<Distribution> types interpret the submatch as a floating
7687 point number, using L<strtod(3)>. The B<Counter*> and B<AbsoluteSet> types
7688 interpret the submatch as an unsigned integer using L<strtoull(3)>. The
7689 B<Derive*> types interpret the submatch as a signed integer using
7690 L<strtoll(3)>. B<CounterInc> and B<DeriveInc> do not use the submatch at all
7691 and it may be omitted in this case.
7693 =item B<Type> I<Type>
7695 Sets the type used to dispatch this value. Detailed information about types and
7696 their configuration can be found in L<types.db(5)>.
7698 =item B<Instance> I<TypeInstance>
7700 This optional setting sets the type instance to use.
7704 =head2 Plugin C<tail_csv>
7706 The I<tail_csv plugin> reads files in the CSV format, e.g. the statistics file
7707 written by I<Snort>.
7712 <Metric "snort-dropped">
7717 <File "/var/log/snort/snort.stats">
7718 Instance "snort-eth0"
7720 Collect "snort-dropped"
7724 The configuration consists of one or more B<Metric> blocks that define an index
7725 into the line of the CSV file and how this value is mapped to I<collectd's>
7726 internal representation. These are followed by one or more B<Instance> blocks
7727 which configure which file to read, in which interval and which metrics to
7732 =item E<lt>B<Metric> I<Name>E<gt>
7734 The B<Metric> block configures a new metric to be extracted from the statistics
7735 file and how it is mapped on I<collectd's> data model. The string I<Name> is
7736 only used inside the B<Instance> blocks to refer to this block, so you can use
7737 one B<Metric> block for multiple CSV files.
7741 =item B<Type> I<Type>
7743 Configures which I<Type> to use when dispatching this metric. Types are defined
7744 in the L<types.db(5)> file, see the appropriate manual page for more
7745 information on specifying types. Only types with a single I<data source> are
7746 supported by the I<tail_csv plugin>. The information whether the value is an
7747 absolute value (i.e. a C<GAUGE>) or a rate (i.e. a C<DERIVE>) is taken from the
7748 I<Type's> definition.
7750 =item B<Instance> I<TypeInstance>
7752 If set, I<TypeInstance> is used to populate the type instance field of the
7753 created value lists. Otherwise, no type instance is used.
7755 =item B<ValueFrom> I<Index>
7757 Configure to read the value from the field with the zero-based index I<Index>.
7758 If the value is parsed as signed integer, unsigned integer or double depends on
7759 the B<Type> setting, see above.
7763 =item E<lt>B<File> I<Path>E<gt>
7765 Each B<File> block represents one CSV file to read. There must be at least one
7766 I<File> block but there can be multiple if you have multiple CSV files.
7770 =item B<Instance> I<PluginInstance>
7772 Sets the I<plugin instance> used when dispatching the values.
7774 =item B<Collect> I<Metric>
7776 Specifies which I<Metric> to collect. This option must be specified at least
7777 once, and you can use this option multiple times to specify more than one
7778 metric to be extracted from this statistic file.
7780 =item B<Interval> I<Seconds>
7782 Configures the interval in which to read values from this instance / file.
7783 Defaults to the plugin's default interval.
7785 =item B<TimeFrom> I<Index>
7787 Rather than using the local time when dispatching a value, read the timestamp
7788 from the field with the zero-based index I<Index>. The value is interpreted as
7789 seconds since epoch. The value is parsed as a double and may be factional.
7795 =head2 Plugin C<teamspeak2>
7797 The C<teamspeak2 plugin> connects to the query port of a teamspeak2 server and
7798 polls interesting global and virtual server data. The plugin can query only one
7799 physical server but unlimited virtual servers. You can use the following
7800 options to configure it:
7804 =item B<Host> I<hostname/ip>
7806 The hostname or ip which identifies the physical server.
7809 =item B<Port> I<port>
7811 The query port of the physical server. This needs to be a string.
7814 =item B<Server> I<port>
7816 This option has to be added once for every virtual server the plugin should
7817 query. If you want to query the virtual server on port 8767 this is what the
7818 option would look like:
7822 This option, although numeric, needs to be a string, i.E<nbsp>e. you B<must>
7823 use quotes around it! If no such statement is given only global information
7828 =head2 Plugin C<ted>
7830 The I<TED> plugin connects to a device of "The Energy Detective", a device to
7831 measure power consumption. These devices are usually connected to a serial
7832 (RS232) or USB port. The plugin opens a configured device and tries to read the
7833 current energy readings. For more information on TED, visit
7834 L<http://www.theenergydetective.com/>.
7836 Available configuration options:
7840 =item B<Device> I<Path>
7842 Path to the device on which TED is connected. collectd will need read and write
7843 permissions on that file.
7845 Default: B</dev/ttyUSB0>
7847 =item B<Retries> I<Num>
7849 Apparently reading from TED is not that reliable. You can therefore configure a
7850 number of retries here. You only configure the I<retries> here, to if you
7851 specify zero, one reading will be performed (but no retries if that fails); if
7852 you specify three, a maximum of four readings are performed. Negative values
7859 =head2 Plugin C<tcpconns>
7861 The C<tcpconns plugin> counts the number of currently established TCP
7862 connections based on the local port and/or the remote port. Since there may be
7863 a lot of connections the default if to count all connections with a local port,
7864 for which a listening socket is opened. You can use the following options to
7865 fine-tune the ports you are interested in:
7869 =item B<ListeningPorts> I<true>|I<false>
7871 If this option is set to I<true>, statistics for all local ports for which a
7872 listening socket exists are collected. The default depends on B<LocalPort> and
7873 B<RemotePort> (see below): If no port at all is specifically selected, the
7874 default is to collect listening ports. If specific ports (no matter if local or
7875 remote ports) are selected, this option defaults to I<false>, i.E<nbsp>e. only
7876 the selected ports will be collected unless this option is set to I<true>
7879 =item B<LocalPort> I<Port>
7881 Count the connections to a specific local port. This can be used to see how
7882 many connections are handled by a specific daemon, e.E<nbsp>g. the mailserver.
7883 You have to specify the port in numeric form, so for the mailserver example
7884 you'd need to set B<25>.
7886 =item B<RemotePort> I<Port>
7888 Count the connections to a specific remote port. This is useful to see how
7889 much a remote service is used. This is most useful if you want to know how many
7890 connections a local service has opened to remote services, e.E<nbsp>g. how many
7891 connections a mail server or news server has to other mail or news servers, or
7892 how many connections a web proxy holds to web servers. You have to give the
7893 port in numeric form.
7895 =item B<AllPortsSummary> I<true>|I<false>
7897 If this option is set to I<true> a summary of statistics from all connections
7898 are collected. This option defaults to I<false>.
7902 =head2 Plugin C<thermal>
7906 =item B<ForceUseProcfs> I<true>|I<false>
7908 By default, the I<Thermal plugin> tries to read the statistics from the Linux
7909 C<sysfs> interface. If that is not available, the plugin falls back to the
7910 C<procfs> interface. By setting this option to I<true>, you can force the
7911 plugin to use the latter. This option defaults to I<false>.
7913 =item B<Device> I<Device>
7915 Selects the name of the thermal device that you want to collect or ignore,
7916 depending on the value of the B<IgnoreSelected> option. This option may be
7917 used multiple times to specify a list of devices.
7919 See F</"IGNORELISTS"> for details.
7921 =item B<IgnoreSelected> I<true>|I<false>
7923 Invert the selection: If set to true, all devices B<except> the ones that
7924 match the device names specified by the B<Device> option are collected. By
7925 default only selected devices are collected if a selection is made. If no
7926 selection is configured at all, B<all> devices are selected.
7930 =head2 Plugin C<threshold>
7932 The I<Threshold plugin> checks values collected or received by I<collectd>
7933 against a configurable I<threshold> and issues I<notifications> if values are
7936 Documentation for this plugin is available in the L<collectd-threshold(5)>
7939 =head2 Plugin C<tokyotyrant>
7941 The I<TokyoTyrant plugin> connects to a TokyoTyrant server and collects a
7942 couple metrics: number of records, and database size on disk.
7946 =item B<Host> I<Hostname/IP>
7948 The hostname or IP which identifies the server.
7949 Default: B<127.0.0.1>
7951 =item B<Port> I<Service/Port>
7953 The query port of the server. This needs to be a string, even if the port is
7954 given in its numeric form.
7959 =head2 Plugin C<turbostat>
7961 The I<Turbostat plugin> reads CPU frequency and C-state residency on modern
7962 Intel processors by using I<Model Specific Registers>.
7966 =item B<CoreCstates> I<Bitmask(Integer)>
7968 Bit mask of the list of core C-states supported by the processor.
7969 This option should only be used if the automated detection fails.
7970 Default value extracted from the CPU model and family.
7972 Currently supported C-states (by this plugin): 3, 6, 7
7976 All states (3, 6 and 7):
7977 (1<<3) + (1<<6) + (1<<7) = 392
7979 =item B<PackageCstates> I<Bitmask(Integer)>
7981 Bit mask of the list of packages C-states supported by the processor. This
7982 option should only be used if the automated detection fails. Default value
7983 extracted from the CPU model and family.
7985 Currently supported C-states (by this plugin): 2, 3, 6, 7, 8, 9, 10
7989 States 2, 3, 6 and 7:
7990 (1<<2) + (1<<3) + (1<<6) + (1<<7) = 396
7992 =item B<SystemManagementInterrupt> I<true>|I<false>
7994 Boolean enabling the collection of the I/O System-Management Interrupt counter.
7995 This option should only be used if the automated detection fails or if you want
7996 to disable this feature.
7998 =item B<DigitalTemperatureSensor> I<true>|I<false>
8000 Boolean enabling the collection of the temperature of each core. This option
8001 should only be used if the automated detection fails or if you want to disable
8004 =item B<TCCActivationTemp> I<Temperature>
8006 I<Thermal Control Circuit Activation Temperature> of the installed CPU. This
8007 temperature is used when collecting the temperature of cores or packages. This
8008 option should only be used if the automated detection fails. Default value
8009 extracted from B<MSR_IA32_TEMPERATURE_TARGET>.
8011 =item B<RunningAveragePowerLimit> I<Bitmask(Integer)>
8013 Bit mask of the list of elements to be thermally monitored. This option should
8014 only be used if the automated detection fails or if you want to disable some
8015 collections. The different bits of this bit mask accepted by this plugin are:
8019 =item 0 ('1'): Package
8023 =item 2 ('4'): Cores
8025 =item 3 ('8'): Embedded graphic device
8029 =item B<LogicalCoreNames> I<true>|I<false>
8031 Boolean enabling the use of logical core numbering for per core statistics.
8032 When enabled, C<cpuE<lt>nE<gt>> is used as plugin instance, where I<n> is a
8033 sequential number assigned by the kernel. Otherwise, C<coreE<lt>nE<gt>> is used
8034 where I<n> is the n-th core of the socket, causing name conflicts when there is
8035 more than one socket.
8039 =head2 Plugin C<unixsock>
8043 =item B<SocketFile> I<Path>
8045 Sets the socket-file which is to be created.
8047 =item B<SocketGroup> I<Group>
8049 If running as root change the group of the UNIX-socket after it has been
8050 created. Defaults to B<collectd>.
8052 =item B<SocketPerms> I<Permissions>
8054 Change the file permissions of the UNIX-socket after it has been created. The
8055 permissions must be given as a numeric, octal value as you would pass to
8056 L<chmod(1)>. Defaults to B<0770>.
8058 =item B<DeleteSocket> B<false>|B<true>
8060 If set to B<true>, delete the socket file before calling L<bind(2)>, if a file
8061 with the given name already exists. If I<collectd> crashes a socket file may be
8062 left over, preventing the daemon from opening a new socket when restarted.
8063 Since this is potentially dangerous, this defaults to B<false>.
8067 =head2 Plugin C<uuid>
8069 This plugin, if loaded, causes the Hostname to be taken from the machine's
8070 UUID. The UUID is a universally unique designation for the machine, usually
8071 taken from the machine's BIOS. This is most useful if the machine is running in
8072 a virtual environment such as Xen, in which case the UUID is preserved across
8073 shutdowns and migration.
8075 The following methods are used to find the machine's UUID, in order:
8081 Check I</etc/uuid> (or I<UUIDFile>).
8085 Check for UUID from HAL (L<http://www.freedesktop.org/wiki/Software/hal>) if
8090 Check for UUID from C<dmidecode> / SMBIOS.
8094 Check for UUID from Xen hypervisor.
8098 If no UUID can be found then the hostname is not modified.
8102 =item B<UUIDFile> I<Path>
8104 Take the UUID from the given file (default I</etc/uuid>).
8108 =head2 Plugin C<varnish>
8110 The I<varnish plugin> collects information about Varnish, an HTTP accelerator.
8111 It collects a subset of the values displayed by L<varnishstat(1)>, and
8112 organizes them in categories which can be enabled or disabled. Currently only
8113 metrics shown in L<varnishstat(1)>'s I<MAIN> section are collected. The exact
8114 meaning of each metric can be found in L<varnish-counters(7)>.
8119 <Instance "example">
8123 CollectConnections true
8124 CollectDirectorDNS false
8128 CollectObjects false
8130 CollectSession false
8140 CollectWorkers false
8144 The configuration consists of one or more E<lt>B<Instance>E<nbsp>I<Name>E<gt>
8145 blocks. I<Name> is the parameter passed to "varnishd -n". If left empty, it
8146 will collectd statistics from the default "varnishd" instance (this should work
8147 fine in most cases).
8149 Inside each E<lt>B<Instance>E<gt> blocks, the following options are recognized:
8153 =item B<CollectBackend> B<true>|B<false>
8155 Back-end connection statistics, such as successful, reused,
8156 and closed connections. True by default.
8158 =item B<CollectBan> B<true>|B<false>
8160 Statistics about ban operations, such as number of bans added, retired, and
8161 number of objects tested against ban operations. Only available with Varnish
8162 3.x and above. False by default.
8164 =item B<CollectCache> B<true>|B<false>
8166 Cache hits and misses. True by default.
8168 =item B<CollectConnections> B<true>|B<false>
8170 Number of client connections received, accepted and dropped. True by default.
8172 =item B<CollectDirectorDNS> B<true>|B<false>
8174 DNS director lookup cache statistics. Only available with Varnish 3.x. False by
8177 =item B<CollectESI> B<true>|B<false>
8179 Edge Side Includes (ESI) parse statistics. False by default.
8181 =item B<CollectFetch> B<true>|B<false>
8183 Statistics about fetches (HTTP requests sent to the backend). False by default.
8185 =item B<CollectHCB> B<true>|B<false>
8187 Inserts and look-ups in the crit bit tree based hash. Look-ups are
8188 divided into locked and unlocked look-ups. False by default.
8190 =item B<CollectObjects> B<true>|B<false>
8192 Statistics on cached objects: number of objects expired, nuked (prematurely
8193 expired), saved, moved, etc. False by default.
8195 =item B<CollectPurge> B<true>|B<false>
8197 Statistics about purge operations, such as number of purges added, retired, and
8198 number of objects tested against purge operations. Only available with Varnish
8199 2.x. False by default.
8201 =item B<CollectSession> B<true>|B<false>
8203 Client session statistics. Number of past and current sessions, session herd and
8204 linger counters, etc. False by default. Note that if using Varnish 4.x, some
8205 metrics found in the Connections and Threads sections with previous versions of
8206 Varnish have been moved here.
8208 =item B<CollectSHM> B<true>|B<false>
8210 Statistics about the shared memory log, a memory region to store
8211 log messages which is flushed to disk when full. True by default.
8213 =item B<CollectSMA> B<true>|B<false>
8215 malloc or umem (umem_alloc(3MALLOC) based) storage statistics. The umem storage
8216 component is Solaris specific. Only available with Varnish 2.x. False by
8219 =item B<CollectSMS> B<true>|B<false>
8221 synth (synthetic content) storage statistics. This storage
8222 component is used internally only. False by default.
8224 =item B<CollectSM> B<true>|B<false>
8226 file (memory mapped file) storage statistics. Only available with Varnish 2.x.
8229 =item B<CollectStruct> B<true>|B<false>
8231 Current varnish internal state statistics. Number of current sessions, objects
8232 in cache store, open connections to backends (with Varnish 2.x), etc. False by
8235 =item B<CollectTotals> B<true>|B<false>
8237 Collects overview counters, such as the number of sessions created,
8238 the number of requests and bytes transferred. False by default.
8240 =item B<CollectUptime> B<true>|B<false>
8242 Varnish uptime. Only available with Varnish 3.x and above. False by default.
8244 =item B<CollectVCL> B<true>|B<false>
8246 Number of total (available + discarded) VCL (config files). False by default.
8248 =item B<CollectVSM> B<true>|B<false>
8250 Collect statistics about Varnish's shared memory usage (used by the logging and
8251 statistics subsystems). Only available with Varnish 4.x. False by default.
8253 =item B<CollectWorkers> B<true>|B<false>
8255 Collect statistics about worker threads. False by default.
8259 =head2 Plugin C<virt>
8261 This plugin allows CPU, disk, network load and other metrics to be collected for
8262 virtualized guests on the machine. The statistics are collected through libvirt
8263 API (L<http://libvirt.org/>). Majority of metrics can be gathered without
8264 installing any additional software on guests, especially I<collectd>, which runs
8265 only on the host system.
8267 Only I<Connection> is required.
8271 =item B<Connection> I<uri>
8273 Connect to the hypervisor given by I<uri>. For example if using Xen use:
8275 Connection "xen:///"
8277 Details which URIs allowed are given at L<http://libvirt.org/uri.html>.
8279 =item B<RefreshInterval> I<seconds>
8281 Refresh the list of domains and devices every I<seconds>. The default is 60
8282 seconds. Setting this to be the same or smaller than the I<Interval> will cause
8283 the list of domains and devices to be refreshed on every iteration.
8285 Refreshing the devices in particular is quite a costly operation, so if your
8286 virtualization setup is static you might consider increasing this. If this
8287 option is set to 0, refreshing is disabled completely.
8289 =item B<Domain> I<name>
8291 =item B<BlockDevice> I<name:dev>
8293 =item B<InterfaceDevice> I<name:dev>
8295 =item B<IgnoreSelected> B<true>|B<false>
8297 Select which domains and devices are collected.
8299 If I<IgnoreSelected> is not given or B<false> then only the listed domains and
8300 disk/network devices are collected.
8302 If I<IgnoreSelected> is B<true> then the test is reversed and the listed
8303 domains and disk/network devices are ignored, while the rest are collected.
8305 The domain name and device names may use a regular expression, if the name is
8306 surrounded by I</.../> and collectd was compiled with support for regexps.
8308 The default is to collect statistics for all domains and all their devices.
8312 BlockDevice "/:hdb/"
8313 IgnoreSelected "true"
8315 Ignore all I<hdb> devices on any domain, but other block devices (eg. I<hda>)
8318 =item B<BlockDeviceFormat> B<target>|B<source>
8320 If I<BlockDeviceFormat> is set to B<target>, the default, then the device name
8321 seen by the guest will be used for reporting metrics.
8322 This corresponds to the C<E<lt>targetE<gt>> node in the XML definition of the
8325 If I<BlockDeviceFormat> is set to B<source>, then metrics will be reported
8326 using the path of the source, e.g. an image file.
8327 This corresponds to the C<E<lt>sourceE<gt>> node in the XML definition of the
8332 If the domain XML have the following device defined:
8334 <disk type='block' device='disk'>
8335 <driver name='qemu' type='raw' cache='none' io='native' discard='unmap'/>
8336 <source dev='/var/lib/libvirt/images/image1.qcow2'/>
8337 <target dev='sda' bus='scsi'/>
8339 <address type='drive' controller='0' bus='0' target='0' unit='0'/>
8342 Setting C<BlockDeviceFormat target> will cause the I<type instance> to be set
8344 Setting C<BlockDeviceFormat source> will cause the I<type instance> to be set
8345 to C<var_lib_libvirt_images_image1.qcow2>.
8347 =item B<BlockDeviceFormatBasename> B<false>|B<true>
8349 The B<BlockDeviceFormatBasename> controls whether the full path or the
8350 L<basename(1)> of the source is being used as the I<type instance> when
8351 B<BlockDeviceFormat> is set to B<source>. Defaults to B<false>.
8355 Assume the device path (source tag) is C</var/lib/libvirt/images/image1.qcow2>.
8356 Setting C<BlockDeviceFormatBasename false> will cause the I<type instance> to
8357 be set to C<var_lib_libvirt_images_image1.qcow2>.
8358 Setting C<BlockDeviceFormatBasename true> will cause the I<type instance> to be
8359 set to C<image1.qcow2>.
8361 =item B<HostnameFormat> B<name|uuid|hostname|...>
8363 When the virt plugin logs data, it sets the hostname of the collected data
8364 according to this setting. The default is to use the guest name as provided by
8365 the hypervisor, which is equal to setting B<name>.
8367 B<uuid> means use the guest's UUID. This is useful if you want to track the
8368 same guest across migrations.
8370 B<hostname> means to use the global B<Hostname> setting, which is probably not
8371 useful on its own because all guests will appear to have the same name.
8373 You can also specify combinations of these fields. For example B<name uuid>
8374 means to concatenate the guest name and UUID (with a literal colon character
8375 between, thus I<"foo:1234-1234-1234-1234">).
8377 At the moment of writing (collectd-5.5), hostname string is limited to 62
8378 characters. In case when combination of fields exceeds 62 characters,
8379 hostname will be truncated without a warning.
8381 =item B<InterfaceFormat> B<name>|B<address>
8383 When the virt plugin logs interface data, it sets the name of the collected
8384 data according to this setting. The default is to use the path as provided by
8385 the hypervisor (the "dev" property of the target node), which is equal to
8388 B<address> means use the interface's mac address. This is useful since the
8389 interface path might change between reboots of a guest or across migrations.
8391 =item B<PluginInstanceFormat> B<name|uuid|none>
8393 When the virt plugin logs data, it sets the plugin_instance of the collected
8394 data according to this setting. The default is to not set the plugin_instance.
8396 B<name> means use the guest's name as provided by the hypervisor.
8397 B<uuid> means use the guest's UUID.
8399 You can also specify combinations of the B<name> and B<uuid> fields.
8400 For example B<name uuid> means to concatenate the guest name and UUID
8401 (with a literal colon character between, thus I<"foo:1234-1234-1234-1234">).
8403 =item B<Instances> B<integer>
8405 How many read instances you want to use for this plugin. The default is one,
8406 and the sensible setting is a multiple of the B<ReadThreads> value.
8407 If you are not sure, just use the default setting.
8409 =item B<ExtraStats> B<string>
8411 Report additional extra statistics. The default is no extra statistics, preserving
8412 the previous behaviour of the plugin. If unsure, leave the default. If enabled,
8413 allows the plugin to reported more detailed statistics about the behaviour of
8414 Virtual Machines. The argument is a space-separated list of selectors.
8416 Currently supported selectors are:
8420 =item B<cpu_util>: report CPU utilization per domain in percentage.
8422 =item B<disk>: report extra statistics like number of flush operations and total
8423 service time for read, write and flush operations. Requires libvirt API version
8426 =item B<disk_err>: report disk errors if any occured. Requires libvirt API version
8429 =item B<domain_state>: report domain state and reason in human-readable format as
8430 a notification. If libvirt API version I<0.9.2> or later is available, domain
8431 reason will be included in notification.
8433 =item B<fs_info>: report file system information as a notification. Requires
8434 libvirt API version I<1.2.11> or later. Can be collected only if I<Guest Agent>
8435 is installed and configured inside VM. Make sure that installed I<Guest Agent>
8436 version supports retrieving file system information.
8438 =item B<job_stats_background>: report statistics about progress of a background
8439 job on a domain. Only one type of job statistics can be collected at the same time.
8440 Requires libvirt API version I<1.2.9> or later.
8442 =item B<job_stats_completed>: report statistics about a recently completed job on
8443 a domain. Only one type of job statistics can be collected at the same time.
8444 Requires libvirt API version I<1.2.9> or later.
8446 =item B<pcpu>: report the physical user/system cpu time consumed by the hypervisor, per-vm.
8447 Requires libvirt API version I<0.9.11> or later.
8449 =item B<perf>: report performance monitoring events. To collect performance
8450 metrics they must be enabled for domain and supported by the platform. Requires
8451 libvirt API version I<1.3.3> or later.
8452 B<Note>: I<perf> metrics can't be collected if I<intel_rdt> plugin is enabled.
8454 =item B<vcpupin>: report pinning of domain VCPUs to host physical CPUs.
8460 =head2 Plugin C<vmem>
8462 The C<vmem> plugin collects information about the usage of virtual memory.
8463 Since the statistics provided by the Linux kernel are very detailed, they are
8464 collected very detailed. However, to get all the details, you have to switch
8465 them on manually. Most people just want an overview over, such as the number of
8466 pages read from swap space.
8470 =item B<Verbose> B<true>|B<false>
8472 Enables verbose collection of information. This will start collecting page
8473 "actions", e.E<nbsp>g. page allocations, (de)activations, steals and so on.
8474 Part of these statistics are collected on a "per zone" basis.
8478 =head2 Plugin C<vserver>
8480 This plugin doesn't have any options. B<VServer> support is only available for
8481 Linux. It cannot yet be found in a vanilla kernel, though. To make use of this
8482 plugin you need a kernel that has B<VServer> support built in, i.E<nbsp>e. you
8483 need to apply the patches and compile your own kernel, which will then provide
8484 the F</proc/virtual> filesystem that is required by this plugin.
8486 The B<VServer> homepage can be found at L<http://linux-vserver.org/>.
8488 B<Note>: The traffic collected by this plugin accounts for the amount of
8489 traffic passing a socket which might be a lot less than the actual on-wire
8490 traffic (e.E<nbsp>g. due to headers and retransmission). If you want to
8491 collect on-wire traffic you could, for example, use the logging facilities of
8492 iptables to feed data for the guest IPs into the iptables plugin.
8494 =head2 Plugin C<write_graphite>
8496 The C<write_graphite> plugin writes data to I<Graphite>, an open-source metrics
8497 storage and graphing project. The plugin connects to I<Carbon>, the data layer
8498 of I<Graphite>, via I<TCP> or I<UDP> and sends data via the "line based"
8499 protocol (per default using portE<nbsp>2003). The data will be sent in blocks
8500 of at most 1428 bytes to minimize the number of network packets.
8504 <Plugin write_graphite>
8514 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
8515 blocks. Inside the B<Node> blocks, the following options are recognized:
8519 =item B<Host> I<Address>
8521 Hostname or address to connect to. Defaults to C<localhost>.
8523 =item B<Port> I<Service>
8525 Service name or port number to connect to. Defaults to C<2003>.
8527 =item B<Protocol> I<String>
8529 Protocol to use when connecting to I<Graphite>. Defaults to C<tcp>.
8531 =item B<ReconnectInterval> I<Seconds>
8533 When set to non-zero, forces the connection to the Graphite backend to be
8534 closed and re-opend periodically. This behavior is desirable in environments
8535 where the connection to the Graphite backend is done through load balancers,
8536 for example. When set to zero, the default, the connetion is kept open for as
8539 =item B<LogSendErrors> B<false>|B<true>
8541 If set to B<true> (the default), logs errors when sending data to I<Graphite>.
8542 If set to B<false>, it will not log the errors. This is especially useful when
8543 using Protocol UDP since many times we want to use the "fire-and-forget"
8544 approach and logging errors fills syslog with unneeded messages.
8546 =item B<Prefix> I<String>
8548 When set, I<String> is added in front of the host name. Dots and whitespace are
8549 I<not> escaped in this string (see B<EscapeCharacter> below).
8551 =item B<Postfix> I<String>
8553 When set, I<String> is appended to the host name. Dots and whitespace are
8554 I<not> escaped in this string (see B<EscapeCharacter> below).
8556 =item B<EscapeCharacter> I<Char>
8558 I<Carbon> uses the dot (C<.>) as escape character and doesn't allow whitespace
8559 in the identifier. The B<EscapeCharacter> option determines which character
8560 dots, whitespace and control characters are replaced with. Defaults to
8563 =item B<StoreRates> B<false>|B<true>
8565 If set to B<true> (the default), convert counter values to rates. If set to
8566 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
8569 =item B<SeparateInstances> B<false>|B<true>
8571 If set to B<true>, the plugin instance and type instance will be in their own
8572 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
8573 default), the plugin and plugin instance (and likewise the type and type
8574 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
8576 =item B<AlwaysAppendDS> B<false>|B<true>
8578 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
8579 identifier. If set to B<false> (the default), this is only done when there is
8582 =item B<PreserveSeparator> B<false>|B<true>
8584 If set to B<false> (the default) the C<.> (dot) character is replaced with
8585 I<EscapeCharacter>. Otherwise, if set to B<true>, the C<.> (dot) character
8586 is preserved, i.e. passed through.
8588 =item B<DropDuplicateFields> B<false>|B<true>
8590 If set to B<true>, detect and remove duplicate components in Graphite metric
8591 names. For example, the metric name C<host.load.load.shortterm> will
8592 be shortened to C<host.load.shortterm>.
8596 =head2 Plugin C<write_log>
8598 The C<write_log> plugin writes metrics as INFO log messages.
8600 This plugin supports two output formats: I<Graphite> and I<JSON>.
8610 =item B<Format> I<Format>
8612 The output format to use. Can be one of C<Graphite> or C<JSON>.
8616 =head2 Plugin C<write_tsdb>
8618 The C<write_tsdb> plugin writes data to I<OpenTSDB>, a scalable open-source
8619 time series database. The plugin connects to a I<TSD>, a masterless, no shared
8620 state daemon that ingests metrics and stores them in HBase. The plugin uses
8621 I<TCP> over the "line based" protocol with a default port 4242. The data will
8622 be sent in blocks of at most 1428 bytes to minimize the number of network
8631 Host "tsd-1.my.domain"
8633 HostTags "status=production"
8637 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
8638 blocks and global directives.
8640 Global directives are:
8644 =item B<ResolveInterval> I<seconds>
8646 =item B<ResolveJitter> I<seconds>
8648 When I<collectd> connects to a TSDB node, it will request the hostname from
8649 DNS. This can become a problem if the TSDB node is unavailable or badly
8650 configured because collectd will request DNS in order to reconnect for every
8651 metric, which can flood your DNS. So you can cache the last value for
8652 I<ResolveInterval> seconds.
8653 Defaults to the I<Interval> of the I<write_tsdb plugin>, e.g. 10E<nbsp>seconds.
8655 You can also define a jitter, a random interval to wait in addition to
8656 I<ResolveInterval>. This prevents all your collectd servers to resolve the
8657 hostname at the same time when the connection fails.
8658 Defaults to the I<Interval> of the I<write_tsdb plugin>, e.g. 10E<nbsp>seconds.
8660 B<Note:> If the DNS resolution has already been successful when the socket
8661 closes, the plugin will try to reconnect immediately with the cached
8662 information. DNS is queried only when the socket is closed for a longer than
8663 I<ResolveInterval> + I<ResolveJitter> seconds.
8667 Inside the B<Node> blocks, the following options are recognized:
8671 =item B<Host> I<Address>
8673 Hostname or address to connect to. Defaults to C<localhost>.
8675 =item B<Port> I<Service>
8677 Service name or port number to connect to. Defaults to C<4242>.
8680 =item B<HostTags> I<String>
8682 When set, I<HostTags> is added to the end of the metric. It is intended to be
8683 used for name=value pairs that the TSD will tag the metric with. Dots and
8684 whitespace are I<not> escaped in this string.
8686 =item B<StoreRates> B<false>|B<true>
8688 If set to B<true>, convert counter values to rates. If set to B<false>
8689 (the default) counter values are stored as is, as an increasing
8692 =item B<AlwaysAppendDS> B<false>|B<true>
8694 If set the B<true>, append the name of the I<Data Source> (DS) to the "metric"
8695 identifier. If set to B<false> (the default), this is only done when there is
8700 =head2 Plugin C<write_mongodb>
8702 The I<write_mongodb plugin> will send values to I<MongoDB>, a schema-less
8707 <Plugin "write_mongodb">
8716 The plugin can send values to multiple instances of I<MongoDB> by specifying
8717 one B<Node> block for each instance. Within the B<Node> blocks, the following
8718 options are available:
8722 =item B<Host> I<Address>
8724 Hostname or address to connect to. Defaults to C<localhost>.
8726 =item B<Port> I<Service>
8728 Service name or port number to connect to. Defaults to C<27017>.
8730 =item B<Timeout> I<Milliseconds>
8732 Set the timeout for each operation on I<MongoDB> to I<Timeout> milliseconds.
8733 Setting this option to zero means no timeout, which is the default.
8735 =item B<StoreRates> B<false>|B<true>
8737 If set to B<true> (the default), convert counter values to rates. If set to
8738 B<false> counter values are stored as is, i.e. as an increasing integer
8741 =item B<Database> I<Database>
8743 =item B<User> I<User>
8745 =item B<Password> I<Password>
8747 Sets the information used when authenticating to a I<MongoDB> database. The
8748 fields are optional (in which case no authentication is attempted), but if you
8749 want to use authentication all three fields must be set.
8753 =head2 Plugin C<write_prometheus>
8755 The I<write_prometheus plugin> implements a tiny webserver that can be scraped
8756 using I<Prometheus>.
8762 =item B<Port> I<Port>
8764 Port the embedded webserver should listen on. Defaults to B<9103>.
8766 =item B<StalenessDelta> I<Seconds>
8768 Time in seconds after which I<Prometheus> considers a metric "stale" if it
8769 hasn't seen any update for it. This value must match the setting in Prometheus.
8770 It defaults to B<300> seconds (5 minutes), same as Prometheus.
8774 I<Prometheus> has a global setting, C<StalenessDelta>, which controls after
8775 which time a metric without updates is considered "stale". This setting
8776 effectively puts an upper limit on the interval in which metrics are reported.
8778 When the I<write_prometheus plugin> encounters a metric with an interval
8779 exceeding this limit, it will inform you, the user, and provide the metric to
8780 I<Prometheus> B<without> a timestamp. That causes I<Prometheus> to consider the
8781 metric "fresh" each time it is scraped, with the time of the scrape being
8782 considered the time of the update. The result is that there appear more
8783 datapoints in I<Prometheus> than were actually created, but at least the metric
8784 doesn't disappear periodically.
8788 =head2 Plugin C<write_http>
8790 This output plugin submits values to an HTTP server using POST requests and
8791 encoding metrics with JSON or using the C<PUTVAL> command described in
8792 L<collectd-unixsock(5)>.
8796 <Plugin "write_http">
8798 URL "http://example.com/post-collectd"
8805 The plugin can send values to multiple HTTP servers by specifying one
8806 E<lt>B<Node>E<nbsp>I<Name>E<gt> block for each server. Within each B<Node>
8807 block, the following options are available:
8813 URL to which the values are submitted to. Mandatory.
8815 =item B<User> I<Username>
8817 Optional user name needed for authentication.
8819 =item B<Password> I<Password>
8821 Optional password needed for authentication.
8823 =item B<VerifyPeer> B<true>|B<false>
8825 Enable or disable peer SSL certificate verification. See
8826 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
8828 =item B<VerifyHost> B<true|false>
8830 Enable or disable peer host name verification. If enabled, the plugin checks if
8831 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
8832 matches the host name provided by the B<URL> option. If this identity check
8833 fails, the connection is aborted. Obviously, only works when connecting to a
8834 SSL enabled server. Enabled by default.
8836 =item B<CACert> I<File>
8838 File that holds one or more SSL certificates. If you want to use HTTPS you will
8839 possibly need this option. What CA certificates come bundled with C<libcurl>
8840 and are checked by default depends on the distribution you use.
8842 =item B<CAPath> I<Directory>
8844 Directory holding one or more CA certificate files. You can use this if for
8845 some reason all the needed CA certificates aren't in the same file and can't be
8846 pointed to using the B<CACert> option. Requires C<libcurl> to be built against
8849 =item B<ClientKey> I<File>
8851 File that holds the private key in PEM format to be used for certificate-based
8854 =item B<ClientCert> I<File>
8856 File that holds the SSL certificate to be used for certificate-based
8859 =item B<ClientKeyPass> I<Password>
8861 Password required to load the private key in B<ClientKey>.
8863 =item B<Header> I<Header>
8865 A HTTP header to add to the request. Multiple headers are added if this option is specified more than once. Example:
8867 Header "X-Custom-Header: custom_value"
8869 =item B<SSLVersion> B<SSLv2>|B<SSLv3>|B<TLSv1>|B<TLSv1_0>|B<TLSv1_1>|B<TLSv1_2>
8871 Define which SSL protocol version must be used. By default C<libcurl> will
8872 attempt to figure out the remote SSL protocol version. See
8873 L<curl_easy_setopt(3)> for more details.
8875 =item B<Format> B<Command>|B<JSON>|B<KAIROSDB>
8877 Format of the output to generate. If set to B<Command>, will create output that
8878 is understood by the I<Exec> and I<UnixSock> plugins. When set to B<JSON>, will
8879 create output in the I<JavaScript Object Notation> (JSON). When set to KAIROSDB
8880 , will create output in the KairosDB format.
8882 Defaults to B<Command>.
8884 =item B<Attribute> I<String> I<String>
8886 Only available for the KAIROSDB output format.
8888 Consider the two given strings to be the key and value of an additional tag for
8889 each metric being sent out.
8891 You can add multiple B<Attribute>.
8895 Only available for the KAIROSDB output format.
8897 Sets the Cassandra ttl for the data points.
8899 Please refer to L<http://kairosdb.github.io/docs/build/html/restapi/AddDataPoints.html?highlight=ttl>
8901 =item B<Metrics> B<true>|B<false>
8903 Controls whether I<metrics> are POSTed to this location. Defaults to B<true>.
8905 =item B<Notifications> B<false>|B<true>
8907 Controls whether I<notifications> are POSTed to this location. Defaults to B<false>.
8909 =item B<StoreRates> B<true|false>
8911 If set to B<true>, convert counter values to rates. If set to B<false> (the
8912 default) counter values are stored as is, i.e. as an increasing integer number.
8914 =item B<BufferSize> I<Bytes>
8916 Sets the send buffer size to I<Bytes>. By increasing this buffer, less HTTP
8917 requests will be generated, but more metrics will be batched / metrics are
8918 cached for longer before being sent, introducing additional delay until they
8919 are available on the server side. I<Bytes> must be at least 1024 and cannot
8920 exceed the size of an C<int>, i.e. 2E<nbsp>GByte.
8921 Defaults to C<4096>.
8923 =item B<LowSpeedLimit> I<Bytes per Second>
8925 Sets the minimal transfer rate in I<Bytes per Second> below which the
8926 connection with the HTTP server will be considered too slow and aborted. All
8927 the data submitted over this connection will probably be lost. Defaults to 0,
8928 which means no minimum transfer rate is enforced.
8930 =item B<Timeout> I<Timeout>
8932 Sets the maximum time in milliseconds given for HTTP POST operations to
8933 complete. When this limit is reached, the POST operation will be aborted, and
8934 all the data in the current send buffer will probably be lost. Defaults to 0,
8935 which means the connection never times out.
8937 =item B<LogHttpError> B<false>|B<true>
8939 Enables printing of HTTP error code to log. Turned off by default.
8941 The C<write_http> plugin regularly submits the collected values to the HTTP
8942 server. How frequently this happens depends on how much data you are collecting
8943 and the size of B<BufferSize>. The optimal value to set B<Timeout> to is
8944 slightly below this interval, which you can estimate by monitoring the network
8945 traffic between collectd and the HTTP server.
8949 =head2 Plugin C<write_kafka>
8951 The I<write_kafka plugin> will send values to a I<Kafka> topic, a distributed
8955 <Plugin "write_kafka">
8956 Property "metadata.broker.list" "broker1:9092,broker2:9092"
8962 The following options are understood by the I<write_kafka plugin>:
8966 =item E<lt>B<Topic> I<Name>E<gt>
8968 The plugin's configuration consists of one or more B<Topic> blocks. Each block
8969 is given a unique I<Name> and specifies one kafka producer.
8970 Inside the B<Topic> block, the following per-topic options are
8975 =item B<Property> I<String> I<String>
8977 Configure the named property for the current topic. Properties are
8978 forwarded to the kafka producer library B<librdkafka>.
8980 =item B<Key> I<String>
8982 Use the specified string as a partitioning key for the topic. Kafka breaks
8983 topic into partitions and guarantees that for a given topology, the same
8984 consumer will be used for a specific key. The special (case insensitive)
8985 string B<Random> can be used to specify that an arbitrary partition should
8988 =item B<Format> B<Command>|B<JSON>|B<Graphite>
8990 Selects the format in which messages are sent to the broker. If set to
8991 B<Command> (the default), values are sent as C<PUTVAL> commands which are
8992 identical to the syntax used by the I<Exec> and I<UnixSock plugins>.
8994 If set to B<JSON>, the values are encoded in the I<JavaScript Object Notation>,
8995 an easy and straight forward exchange format.
8997 If set to B<Graphite>, values are encoded in the I<Graphite> format, which is
8998 C<E<lt>metricE<gt> E<lt>valueE<gt> E<lt>timestampE<gt>\n>.
9000 =item B<StoreRates> B<true>|B<false>
9002 Determines whether or not C<COUNTER>, C<DERIVE> and C<ABSOLUTE> data sources
9003 are converted to a I<rate> (i.e. a C<GAUGE> value). If set to B<false> (the
9004 default), no conversion is performed. Otherwise the conversion is performed
9005 using the internal value cache.
9007 Please note that currently this option is only used if the B<Format> option has
9008 been set to B<JSON>.
9010 =item B<GraphitePrefix> (B<Format>=I<Graphite> only)
9012 A prefix can be added in the metric name when outputting in the I<Graphite>
9013 format. It's added before the I<Host> name.
9015 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>>
9017 =item B<GraphitePostfix> (B<Format>=I<Graphite> only)
9019 A postfix can be added in the metric name when outputting in the I<Graphite>
9020 format. It's added after the I<Host> name.
9022 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>>
9024 =item B<GraphiteEscapeChar> (B<Format>=I<Graphite> only)
9026 Specify a character to replace dots (.) in the host part of the metric name.
9027 In I<Graphite> metric name, dots are used as separators between different
9028 metric parts (host, plugin, type).
9029 Default is C<_> (I<Underscore>).
9031 =item B<GraphiteSeparateInstances> B<false>|B<true>
9033 If set to B<true>, the plugin instance and type instance will be in their own
9034 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
9035 default), the plugin and plugin instance (and likewise the type and type
9036 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
9038 =item B<GraphiteAlwaysAppendDS> B<true>|B<false>
9040 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
9041 identifier. If set to B<false> (the default), this is only done when there is
9044 =item B<GraphitePreserveSeparator> B<false>|B<true>
9046 If set to B<false> (the default) the C<.> (dot) character is replaced with
9047 I<GraphiteEscapeChar>. Otherwise, if set to B<true>, the C<.> (dot) character
9048 is preserved, i.e. passed through.
9050 =item B<StoreRates> B<true>|B<false>
9052 If set to B<true> (the default), convert counter values to rates. If set to
9053 B<false> counter values are stored as is, i.e. as an increasing integer number.
9055 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
9056 converted values will have "rate" appended to the data source type, e.g.
9057 C<ds_type:derive:rate>.
9061 =item B<Property> I<String> I<String>
9063 Configure the kafka producer through properties, you almost always will
9064 want to set B<metadata.broker.list> to your Kafka broker list.
9068 =head2 Plugin C<write_redis>
9070 The I<write_redis plugin> submits values to I<Redis>, a data structure server.
9074 <Plugin "write_redis">
9086 Values are submitted to I<Sorted Sets>, using the metric name as the key, and
9087 the timestamp as the score. Retrieving a date range can then be done using the
9088 C<ZRANGEBYSCORE> I<Redis> command. Additionally, all the identifiers of these
9089 I<Sorted Sets> are kept in a I<Set> called C<collectd/values> (or
9090 C<${prefix}/values> if the B<Prefix> option was specified) and can be retrieved
9091 using the C<SMEMBERS> I<Redis> command. You can specify the database to use
9092 with the B<Database> parameter (default is C<0>). See
9093 L<http://redis.io/commands#sorted_set> and L<http://redis.io/commands#set> for
9096 The information shown in the synopsis above is the I<default configuration>
9097 which is used by the plugin if no configuration is present.
9099 The plugin can send values to multiple instances of I<Redis> by specifying
9100 one B<Node> block for each instance. Within the B<Node> blocks, the following
9101 options are available:
9105 =item B<Node> I<Nodename>
9107 The B<Node> block identifies a new I<Redis> node, that is a new I<Redis>
9108 instance running on a specified host and port. The node name is a
9109 canonical identifier which is used as I<plugin instance>. It is limited to
9110 51E<nbsp>characters in length.
9112 =item B<Host> I<Hostname>
9114 The B<Host> option is the hostname or IP-address where the I<Redis> instance is
9117 =item B<Port> I<Port>
9119 The B<Port> option is the TCP port on which the Redis instance accepts
9120 connections. Either a service name of a port number may be given. Please note
9121 that numerical port numbers must be given as a string, too.
9123 =item B<Timeout> I<Milliseconds>
9125 The B<Timeout> option sets the socket connection timeout, in milliseconds.
9127 =item B<Prefix> I<Prefix>
9129 Prefix used when constructing the name of the I<Sorted Sets> and the I<Set>
9130 containing all metrics. Defaults to C<collectd/>, so metrics will have names
9131 like C<collectd/cpu-0/cpu-user>. When setting this to something different, it
9132 is recommended but not required to include a trailing slash in I<Prefix>.
9134 =item B<Database> I<Index>
9136 This index selects the redis database to use for writing operations. Defaults
9139 =item B<MaxSetSize> I<Items>
9141 The B<MaxSetSize> option limits the number of items that the I<Sorted Sets> can
9142 hold. Negative values for I<Items> sets no limit, which is the default behavior.
9144 =item B<StoreRates> B<true>|B<false>
9146 If set to B<true> (the default), convert counter values to rates. If set to
9147 B<false> counter values are stored as is, i.e. as an increasing integer number.
9151 =head2 Plugin C<write_riemann>
9153 The I<write_riemann plugin> will send values to I<Riemann>, a powerful stream
9154 aggregation and monitoring system. The plugin sends I<Protobuf> encoded data to
9155 I<Riemann> using UDP packets.
9159 <Plugin "write_riemann">
9165 AlwaysAppendDS false
9169 Attribute "foo" "bar"
9172 The following options are understood by the I<write_riemann plugin>:
9176 =item E<lt>B<Node> I<Name>E<gt>
9178 The plugin's configuration consists of one or more B<Node> blocks. Each block
9179 is given a unique I<Name> and specifies one connection to an instance of
9180 I<Riemann>. Indise the B<Node> block, the following per-connection options are
9185 =item B<Host> I<Address>
9187 Hostname or address to connect to. Defaults to C<localhost>.
9189 =item B<Port> I<Service>
9191 Service name or port number to connect to. Defaults to C<5555>.
9193 =item B<Protocol> B<UDP>|B<TCP>|B<TLS>
9195 Specify the protocol to use when communicating with I<Riemann>. Defaults to
9198 =item B<TLSCertFile> I<Path>
9200 When using the B<TLS> protocol, path to a PEM certificate to present
9203 =item B<TLSCAFile> I<Path>
9205 When using the B<TLS> protocol, path to a PEM CA certificate to
9206 use to validate the remote hosts's identity.
9208 =item B<TLSKeyFile> I<Path>
9210 When using the B<TLS> protocol, path to a PEM private key associated
9211 with the certificate defined by B<TLSCertFile>.
9213 =item B<Batch> B<true>|B<false>
9215 If set to B<true> and B<Protocol> is set to B<TCP>,
9216 events will be batched in memory and flushed at
9217 regular intervals or when B<BatchMaxSize> is exceeded.
9219 Notifications are not batched and sent as soon as possible.
9221 When enabled, it can occur that events get processed by the Riemann server
9222 close to or after their expiration time. Tune the B<TTLFactor> and
9223 B<BatchMaxSize> settings according to the amount of values collected, if this
9228 =item B<BatchMaxSize> I<size>
9230 Maximum payload size for a riemann packet. Defaults to 8192
9232 =item B<BatchFlushTimeout> I<seconds>
9234 Maximum amount of seconds to wait in between to batch flushes.
9235 No timeout by default.
9237 =item B<StoreRates> B<true>|B<false>
9239 If set to B<true> (the default), convert counter values to rates. If set to
9240 B<false> counter values are stored as is, i.e. as an increasing integer number.
9242 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
9243 converted values will have "rate" appended to the data source type, e.g.
9244 C<ds_type:derive:rate>.
9246 =item B<AlwaysAppendDS> B<false>|B<true>
9248 If set to B<true>, append the name of the I<Data Source> (DS) to the
9249 "service", i.e. the field that, together with the "host" field, uniquely
9250 identifies a metric in I<Riemann>. If set to B<false> (the default), this is
9251 only done when there is more than one DS.
9253 =item B<TTLFactor> I<Factor>
9255 I<Riemann> events have a I<Time to Live> (TTL) which specifies how long each
9256 event is considered active. I<collectd> populates this field based on the
9257 metrics interval setting. This setting controls the factor with which the
9258 interval is multiplied to set the TTL. The default value is B<2.0>. Unless you
9259 know exactly what you're doing, you should only increase this setting from its
9262 =item B<Notifications> B<false>|B<true>
9264 If set to B<true>, create riemann events for notifications. This is B<true>
9265 by default. When processing thresholds from write_riemann, it might prove
9266 useful to avoid getting notification events.
9268 =item B<CheckThresholds> B<false>|B<true>
9270 If set to B<true>, attach state to events based on thresholds defined
9271 in the B<Threshold> plugin. Defaults to B<false>.
9273 =item B<EventServicePrefix> I<String>
9275 Add the given string as a prefix to the event service name.
9276 If B<EventServicePrefix> not set or set to an empty string (""),
9277 no prefix will be used.
9281 =item B<Tag> I<String>
9283 Add the given string as an additional tag to the metric being sent to
9286 =item B<Attribute> I<String> I<String>
9288 Consider the two given strings to be the key and value of an additional
9289 attribute for each metric being sent out to I<Riemann>.
9293 =head2 Plugin C<write_sensu>
9295 The I<write_sensu plugin> will send values to I<Sensu>, a powerful stream
9296 aggregation and monitoring system. The plugin sends I<JSON> encoded data to
9297 a local I<Sensu> client using a TCP socket.
9299 At the moment, the I<write_sensu plugin> does not send over a collectd_host
9300 parameter so it is not possible to use one collectd instance as a gateway for
9301 others. Each collectd host must pair with one I<Sensu> client.
9305 <Plugin "write_sensu">
9310 AlwaysAppendDS false
9311 MetricHandler "influx"
9312 MetricHandler "default"
9313 NotificationHandler "flapjack"
9314 NotificationHandler "howling_monkey"
9318 Attribute "foo" "bar"
9321 The following options are understood by the I<write_sensu plugin>:
9325 =item E<lt>B<Node> I<Name>E<gt>
9327 The plugin's configuration consists of one or more B<Node> blocks. Each block
9328 is given a unique I<Name> and specifies one connection to an instance of
9329 I<Sensu>. Inside the B<Node> block, the following per-connection options are
9334 =item B<Host> I<Address>
9336 Hostname or address to connect to. Defaults to C<localhost>.
9338 =item B<Port> I<Service>
9340 Service name or port number to connect to. Defaults to C<3030>.
9342 =item B<StoreRates> B<true>|B<false>
9344 If set to B<true> (the default), convert counter values to rates. If set to
9345 B<false> counter values are stored as is, i.e. as an increasing integer number.
9347 This will be reflected in the C<collectd_data_source_type> tag: If
9348 B<StoreRates> is enabled, converted values will have "rate" appended to the
9349 data source type, e.g. C<collectd_data_source_type:derive:rate>.
9351 =item B<AlwaysAppendDS> B<false>|B<true>
9353 If set the B<true>, append the name of the I<Data Source> (DS) to the
9354 "service", i.e. the field that, together with the "host" field, uniquely
9355 identifies a metric in I<Sensu>. If set to B<false> (the default), this is
9356 only done when there is more than one DS.
9358 =item B<Notifications> B<false>|B<true>
9360 If set to B<true>, create I<Sensu> events for notifications. This is B<false>
9361 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
9363 =item B<Metrics> B<false>|B<true>
9365 If set to B<true>, create I<Sensu> events for metrics. This is B<false>
9366 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
9369 =item B<Separator> I<String>
9371 Sets the separator for I<Sensu> metrics name or checks. Defaults to "/".
9373 =item B<MetricHandler> I<String>
9375 Add a handler that will be set when metrics are sent to I<Sensu>. You can add
9376 several of them, one per line. Defaults to no handler.
9378 =item B<NotificationHandler> I<String>
9380 Add a handler that will be set when notifications are sent to I<Sensu>. You can
9381 add several of them, one per line. Defaults to no handler.
9383 =item B<EventServicePrefix> I<String>
9385 Add the given string as a prefix to the event service name.
9386 If B<EventServicePrefix> not set or set to an empty string (""),
9387 no prefix will be used.
9391 =item B<Tag> I<String>
9393 Add the given string as an additional tag to the metric being sent to
9396 =item B<Attribute> I<String> I<String>
9398 Consider the two given strings to be the key and value of an additional
9399 attribute for each metric being sent out to I<Sensu>.
9403 =head2 Plugin C<xencpu>
9405 This plugin collects metrics of hardware CPU load for machine running Xen
9406 hypervisor. Load is calculated from 'idle time' value, provided by Xen.
9407 Result is reported using the C<percent> type, for each CPU (core).
9409 This plugin doesn't have any options (yet).
9411 =head2 Plugin C<zookeeper>
9413 The I<zookeeper plugin> will collect statistics from a I<Zookeeper> server
9414 using the mntr command. It requires Zookeeper 3.4.0+ and access to the
9419 <Plugin "zookeeper">
9426 =item B<Host> I<Address>
9428 Hostname or address to connect to. Defaults to C<localhost>.
9430 =item B<Port> I<Service>
9432 Service name or port number to connect to. Defaults to C<2181>.
9436 =head1 THRESHOLD CONFIGURATION
9438 Starting with version C<4.3.0> collectd has support for B<monitoring>. By that
9439 we mean that the values are not only stored or sent somewhere, but that they
9440 are judged and, if a problem is recognized, acted upon. The only action
9441 collectd takes itself is to generate and dispatch a "notification". Plugins can
9442 register to receive notifications and perform appropriate further actions.
9444 Since systems and what you expect them to do differ a lot, you can configure
9445 B<thresholds> for your values freely. This gives you a lot of flexibility but
9446 also a lot of responsibility.
9448 Every time a value is out of range a notification is dispatched. This means
9449 that the idle percentage of your CPU needs to be less then the configured
9450 threshold only once for a notification to be generated. There's no such thing
9451 as a moving average or similar - at least not now.
9453 Also, all values that match a threshold are considered to be relevant or
9454 "interesting". As a consequence collectd will issue a notification if they are
9455 not received for B<Timeout> iterations. The B<Timeout> configuration option is
9456 explained in section L<"GLOBAL OPTIONS">. If, for example, B<Timeout> is set to
9457 "2" (the default) and some hosts sends it's CPU statistics to the server every
9458 60 seconds, a notification will be dispatched after about 120 seconds. It may
9459 take a little longer because the timeout is checked only once each B<Interval>
9462 When a value comes within range again or is received after it was missing, an
9463 "OKAY-notification" is dispatched.
9465 Here is a configuration example to get you started. Read below for more
9478 <Plugin "interface">
9495 WarningMin 100000000
9501 There are basically two types of configuration statements: The C<Host>,
9502 C<Plugin>, and C<Type> blocks select the value for which a threshold should be
9503 configured. The C<Plugin> and C<Type> blocks may be specified further using the
9504 C<Instance> option. You can combine the block by nesting the blocks, though
9505 they must be nested in the above order, i.E<nbsp>e. C<Host> may contain either
9506 C<Plugin> and C<Type> blocks, C<Plugin> may only contain C<Type> blocks and
9507 C<Type> may not contain other blocks. If multiple blocks apply to the same
9508 value the most specific block is used.
9510 The other statements specify the threshold to configure. They B<must> be
9511 included in a C<Type> block. Currently the following statements are recognized:
9515 =item B<FailureMax> I<Value>
9517 =item B<WarningMax> I<Value>
9519 Sets the upper bound of acceptable values. If unset defaults to positive
9520 infinity. If a value is greater than B<FailureMax> a B<FAILURE> notification
9521 will be created. If the value is greater than B<WarningMax> but less than (or
9522 equal to) B<FailureMax> a B<WARNING> notification will be created.
9524 =item B<FailureMin> I<Value>
9526 =item B<WarningMin> I<Value>
9528 Sets the lower bound of acceptable values. If unset defaults to negative
9529 infinity. If a value is less than B<FailureMin> a B<FAILURE> notification will
9530 be created. If the value is less than B<WarningMin> but greater than (or equal
9531 to) B<FailureMin> a B<WARNING> notification will be created.
9533 =item B<DataSource> I<DSName>
9535 Some data sets have more than one "data source". Interesting examples are the
9536 C<if_octets> data set, which has received (C<rx>) and sent (C<tx>) bytes and
9537 the C<disk_ops> data set, which holds C<read> and C<write> operations. The
9538 system load data set, C<load>, even has three data sources: C<shortterm>,
9539 C<midterm>, and C<longterm>.
9541 Normally, all data sources are checked against a configured threshold. If this
9542 is undesirable, or if you want to specify different limits for each data
9543 source, you can use the B<DataSource> option to have a threshold apply only to
9546 =item B<Invert> B<true>|B<false>
9548 If set to B<true> the range of acceptable values is inverted, i.E<nbsp>e.
9549 values between B<FailureMin> and B<FailureMax> (B<WarningMin> and
9550 B<WarningMax>) are not okay. Defaults to B<false>.
9552 =item B<Persist> B<true>|B<false>
9554 Sets how often notifications are generated. If set to B<true> one notification
9555 will be generated for each value that is out of the acceptable range. If set to
9556 B<false> (the default) then a notification is only generated if a value is out
9557 of range but the previous value was okay.
9559 This applies to missing values, too: If set to B<true> a notification about a
9560 missing value is generated once every B<Interval> seconds. If set to B<false>
9561 only one such notification is generated until the value appears again.
9563 =item B<Percentage> B<true>|B<false>
9565 If set to B<true>, the minimum and maximum values given are interpreted as
9566 percentage value, relative to the other data sources. This is helpful for
9567 example for the "df" type, where you may want to issue a warning when less than
9568 5E<nbsp>% of the total space is available. Defaults to B<false>.
9570 =item B<Hits> I<Number>
9572 Delay creating the notification until the threshold has been passed I<Number>
9573 times. When a notification has been generated, or when a subsequent value is
9574 inside the threshold, the counter is reset. If, for example, a value is
9575 collected once every 10E<nbsp>seconds and B<Hits> is set to 3, a notification
9576 will be dispatched at most once every 30E<nbsp>seconds.
9578 This is useful when short bursts are not a problem. If, for example, 100% CPU
9579 usage for up to a minute is normal (and data is collected every
9580 10E<nbsp>seconds), you could set B<Hits> to B<6> to account for this.
9582 =item B<Hysteresis> I<Number>
9584 When set to non-zero, a hysteresis value is applied when checking minimum and
9585 maximum bounds. This is useful for values that increase slowly and fluctuate a
9586 bit while doing so. When these values come close to the threshold, they may
9587 "flap", i.e. switch between failure / warning case and okay case repeatedly.
9589 If, for example, the threshold is configures as
9594 then a I<Warning> notification is created when the value exceeds I<101> and the
9595 corresponding I<Okay> notification is only created once the value falls below
9596 I<99>, thus avoiding the "flapping".
9600 =head1 FILTER CONFIGURATION
9602 Starting with collectd 4.6 there is a powerful filtering infrastructure
9603 implemented in the daemon. The concept has mostly been copied from
9604 I<ip_tables>, the packet filter infrastructure for Linux. We'll use a similar
9605 terminology, so that users that are familiar with iptables feel right at home.
9609 The following are the terms used in the remainder of the filter configuration
9610 documentation. For an ASCII-art schema of the mechanism, see
9611 L<"General structure"> below.
9617 A I<match> is a criteria to select specific values. Examples are, of course, the
9618 name of the value or it's current value.
9620 Matches are implemented in plugins which you have to load prior to using the
9621 match. The name of such plugins starts with the "match_" prefix.
9625 A I<target> is some action that is to be performed with data. Such actions
9626 could, for example, be to change part of the value's identifier or to ignore
9627 the value completely.
9629 Some of these targets are built into the daemon, see L<"Built-in targets">
9630 below. Other targets are implemented in plugins which you have to load prior to
9631 using the target. The name of such plugins starts with the "target_" prefix.
9635 The combination of any number of matches and at least one target is called a
9636 I<rule>. The target actions will be performed for all values for which B<all>
9637 matches apply. If the rule does not have any matches associated with it, the
9638 target action will be performed for all values.
9642 A I<chain> is a list of rules and possibly default targets. The rules are tried
9643 in order and if one matches, the associated target will be called. If a value
9644 is handled by a rule, it depends on the target whether or not any subsequent
9645 rules are considered or if traversal of the chain is aborted, see
9646 L<"Flow control"> below. After all rules have been checked, the default targets
9651 =head2 General structure
9653 The following shows the resulting structure:
9660 +---------+ +---------+ +---------+ +---------+
9661 ! Rule !->! Match !->! Match !->! Target !
9662 +---------+ +---------+ +---------+ +---------+
9665 +---------+ +---------+ +---------+
9666 ! Rule !->! Target !->! Target !
9667 +---------+ +---------+ +---------+
9674 +---------+ +---------+ +---------+
9675 ! Rule !->! Match !->! Target !
9676 +---------+ +---------+ +---------+
9686 There are four ways to control which way a value takes through the filter
9693 The built-in B<jump> target can be used to "call" another chain, i.E<nbsp>e.
9694 process the value with another chain. When the called chain finishes, usually
9695 the next target or rule after the jump is executed.
9699 The stop condition, signaled for example by the built-in target B<stop>, causes
9700 all processing of the value to be stopped immediately.
9704 Causes processing in the current chain to be aborted, but processing of the
9705 value generally will continue. This means that if the chain was called via
9706 B<Jump>, the next target or rule after the jump will be executed. If the chain
9707 was not called by another chain, control will be returned to the daemon and it
9708 may pass the value to another chain.
9712 Most targets will signal the B<continue> condition, meaning that processing
9713 should continue normally. There is no special built-in target for this
9720 The configuration reflects this structure directly:
9722 PostCacheChain "PostCache"
9724 <Rule "ignore_mysql_show">
9727 Type "^mysql_command$"
9728 TypeInstance "^show_"
9738 The above configuration example will ignore all values where the plugin field
9739 is "mysql", the type is "mysql_command" and the type instance begins with
9740 "show_". All other values will be sent to the C<rrdtool> write plugin via the
9741 default target of the chain. Since this chain is run after the value has been
9742 added to the cache, the MySQL C<show_*> command statistics will be available
9743 via the C<unixsock> plugin.
9745 =head2 List of configuration options
9749 =item B<PreCacheChain> I<ChainName>
9751 =item B<PostCacheChain> I<ChainName>
9753 Configure the name of the "pre-cache chain" and the "post-cache chain". The
9754 argument is the name of a I<chain> that should be executed before and/or after
9755 the values have been added to the cache.
9757 To understand the implications, it's important you know what is going on inside
9758 I<collectd>. The following diagram shows how values are passed from the
9759 read-plugins to the write-plugins:
9765 + - - - - V - - - - +
9766 : +---------------+ :
9769 : +-------+-------+ :
9772 : +-------+-------+ : +---------------+
9773 : ! Cache !--->! Value Cache !
9774 : ! insert ! : +---+---+-------+
9775 : +-------+-------+ : ! !
9776 : ! ,------------' !
9778 : +-------+---+---+ : +-------+-------+
9779 : ! Post-Cache +--->! Write-Plugins !
9780 : ! Chain ! : +---------------+
9781 : +---------------+ :
9784 + - - - - - - - - - +
9786 After the values are passed from the "read" plugins to the dispatch functions,
9787 the pre-cache chain is run first. The values are added to the internal cache
9788 afterwards. The post-cache chain is run after the values have been added to the
9789 cache. So why is it such a huge deal if chains are run before or after the
9790 values have been added to this cache?
9792 Targets that change the identifier of a value list should be executed before
9793 the values are added to the cache, so that the name in the cache matches the
9794 name that is used in the "write" plugins. The C<unixsock> plugin, too, uses
9795 this cache to receive a list of all available values. If you change the
9796 identifier after the value list has been added to the cache, this may easily
9797 lead to confusion, but it's not forbidden of course.
9799 The cache is also used to convert counter values to rates. These rates are, for
9800 example, used by the C<value> match (see below). If you use the rate stored in
9801 the cache B<before> the new value is added, you will use the old, B<previous>
9802 rate. Write plugins may use this rate, too, see the C<csv> plugin, for example.
9803 The C<unixsock> plugin uses these rates too, to implement the C<GETVAL>
9806 Last but not last, the B<stop> target makes a difference: If the pre-cache
9807 chain returns the stop condition, the value will not be added to the cache and
9808 the post-cache chain will not be run.
9810 =item B<Chain> I<Name>
9812 Adds a new chain with a certain name. This name can be used to refer to a
9813 specific chain, for example to jump to it.
9815 Within the B<Chain> block, there can be B<Rule> blocks and B<Target> blocks.
9817 =item B<Rule> [I<Name>]
9819 Adds a new rule to the current chain. The name of the rule is optional and
9820 currently has no meaning for the daemon.
9822 Within the B<Rule> block, there may be any number of B<Match> blocks and there
9823 must be at least one B<Target> block.
9825 =item B<Match> I<Name>
9827 Adds a match to a B<Rule> block. The name specifies what kind of match should
9828 be performed. Available matches depend on the plugins that have been loaded.
9830 The arguments inside the B<Match> block are passed to the plugin implementing
9831 the match, so which arguments are valid here depends on the plugin being used.
9832 If you do not need any to pass any arguments to a match, you can use the
9837 Which is equivalent to:
9842 =item B<Target> I<Name>
9844 Add a target to a rule or a default target to a chain. The name specifies what
9845 kind of target is to be added. Which targets are available depends on the
9846 plugins being loaded.
9848 The arguments inside the B<Target> block are passed to the plugin implementing
9849 the target, so which arguments are valid here depends on the plugin being used.
9850 If you do not need any to pass any arguments to a target, you can use the
9855 This is the same as writing:
9862 =head2 Built-in targets
9864 The following targets are built into the core daemon and therefore need no
9865 plugins to be loaded:
9871 Signals the "return" condition, see the L<"Flow control"> section above. This
9872 causes the current chain to stop processing the value and returns control to
9873 the calling chain. The calling chain will continue processing targets and rules
9874 just after the B<jump> target (see below). This is very similar to the
9875 B<RETURN> target of iptables, see L<iptables(8)>.
9877 This target does not have any options.
9885 Signals the "stop" condition, see the L<"Flow control"> section above. This
9886 causes processing of the value to be aborted immediately. This is similar to
9887 the B<DROP> target of iptables, see L<iptables(8)>.
9889 This target does not have any options.
9897 Sends the value to "write" plugins.
9903 =item B<Plugin> I<Name>
9905 Name of the write plugin to which the data should be sent. This option may be
9906 given multiple times to send the data to more than one write plugin. If the
9907 plugin supports multiple instances, the plugin's instance(s) must also be
9912 If no plugin is explicitly specified, the values will be sent to all available
9915 Single-instance plugin example:
9921 Multi-instance plugin example:
9923 <Plugin "write_graphite">
9933 Plugin "write_graphite/foo"
9938 Starts processing the rules of another chain, see L<"Flow control"> above. If
9939 the end of that chain is reached, or a stop condition is encountered,
9940 processing will continue right after the B<jump> target, i.E<nbsp>e. with the
9941 next target or the next rule. This is similar to the B<-j> command line option
9942 of iptables, see L<iptables(8)>.
9948 =item B<Chain> I<Name>
9950 Jumps to the chain I<Name>. This argument is required and may appear only once.
9962 =head2 Available matches
9968 Matches a value using regular expressions.
9974 =item B<Host> I<Regex>
9976 =item B<Plugin> I<Regex>
9978 =item B<PluginInstance> I<Regex>
9980 =item B<Type> I<Regex>
9982 =item B<TypeInstance> I<Regex>
9984 =item B<MetaData> I<String> I<Regex>
9986 Match values where the given regular expressions match the various fields of
9987 the identifier of a value. If multiple regular expressions are given, B<all>
9988 regexen must match for a value to match.
9990 =item B<Invert> B<false>|B<true>
9992 When set to B<true>, the result of the match is inverted, i.e. all value lists
9993 where all regular expressions apply are not matched, all other value lists are
9994 matched. Defaults to B<false>.
10001 Host "customer[0-9]+"
10007 Matches values that have a time which differs from the time on the server.
10009 This match is mainly intended for servers that receive values over the
10010 C<network> plugin and write them to disk using the C<rrdtool> plugin. RRDtool
10011 is very sensitive to the timestamp used when updating the RRD files. In
10012 particular, the time must be ever increasing. If a misbehaving client sends one
10013 packet with a timestamp far in the future, all further packets with a correct
10014 time will be ignored because of that one packet. What's worse, such corrupted
10015 RRD files are hard to fix.
10017 This match lets one match all values B<outside> a specified time range
10018 (relative to the server's time), so you can use the B<stop> target (see below)
10019 to ignore the value, for example.
10025 =item B<Future> I<Seconds>
10027 Matches all values that are I<ahead> of the server's time by I<Seconds> or more
10028 seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
10031 =item B<Past> I<Seconds>
10033 Matches all values that are I<behind> of the server's time by I<Seconds> or
10034 more seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
10046 This example matches all values that are five minutes or more ahead of the
10047 server or one hour (or more) lagging behind.
10051 Matches the actual value of data sources against given minimumE<nbsp>/ maximum
10052 values. If a data-set consists of more than one data-source, all data-sources
10053 must match the specified ranges for a positive match.
10059 =item B<Min> I<Value>
10061 Sets the smallest value which still results in a match. If unset, behaves like
10064 =item B<Max> I<Value>
10066 Sets the largest value which still results in a match. If unset, behaves like
10069 =item B<Invert> B<true>|B<false>
10071 Inverts the selection. If the B<Min> and B<Max> settings result in a match,
10072 no-match is returned and vice versa. Please note that the B<Invert> setting
10073 only effects how B<Min> and B<Max> are applied to a specific value. Especially
10074 the B<DataSource> and B<Satisfy> settings (see below) are not inverted.
10076 =item B<DataSource> I<DSName> [I<DSName> ...]
10078 Select one or more of the data sources. If no data source is configured, all
10079 data sources will be checked. If the type handled by the match does not have a
10080 data source of the specified name(s), this will always result in no match
10081 (independent of the B<Invert> setting).
10083 =item B<Satisfy> B<Any>|B<All>
10085 Specifies how checking with several data sources is performed. If set to
10086 B<Any>, the match succeeds if one of the data sources is in the configured
10087 range. If set to B<All> the match only succeeds if all data sources are within
10088 the configured range. Default is B<All>.
10090 Usually B<All> is used for positive matches, B<Any> is used for negative
10091 matches. This means that with B<All> you usually check that all values are in a
10092 "good" range, while with B<Any> you check if any value is within a "bad" range
10093 (or outside the "good" range).
10097 Either B<Min> or B<Max>, but not both, may be unset.
10101 # Match all values smaller than or equal to 100. Matches only if all data
10102 # sources are below 100.
10108 # Match if the value of any data source is outside the range of 0 - 100.
10116 =item B<empty_counter>
10118 Matches all values with one or more data sources of type B<COUNTER> and where
10119 all counter values are zero. These counters usually I<never> increased since
10120 they started existing (and are therefore uninteresting), or got reset recently
10121 or overflowed and you had really, I<really> bad luck.
10123 Please keep in mind that ignoring such counters can result in confusing
10124 behavior: Counters which hardly ever increase will be zero for long periods of
10125 time. If the counter is reset for some reason (machine or service restarted,
10126 usually), the graph will be empty (NAN) for a long time. People may not
10131 Calculates a hash value of the host name and matches values according to that
10132 hash value. This makes it possible to divide all hosts into groups and match
10133 only values that are in a specific group. The intended use is in load
10134 balancing, where you want to handle only part of all data and leave the rest
10137 The hashing function used tries to distribute the hosts evenly. First, it
10138 calculates a 32E<nbsp>bit hash value using the characters of the hostname:
10141 for (i = 0; host[i] != 0; i++)
10142 hash_value = (hash_value * 251) + host[i];
10144 The constant 251 is a prime number which is supposed to make this hash value
10145 more random. The code then checks the group for this host according to the
10146 I<Total> and I<Match> arguments:
10148 if ((hash_value % Total) == Match)
10153 Please note that when you set I<Total> to two (i.E<nbsp>e. you have only two
10154 groups), then the least significant bit of the hash value will be the XOR of
10155 all least significant bits in the host name. One consequence is that when you
10156 have two hosts, "server0.example.com" and "server1.example.com", where the host
10157 name differs in one digit only and the digits differ by one, those hosts will
10158 never end up in the same group.
10164 =item B<Match> I<Match> I<Total>
10166 Divide the data into I<Total> groups and match all hosts in group I<Match> as
10167 described above. The groups are numbered from zero, i.E<nbsp>e. I<Match> must
10168 be smaller than I<Total>. I<Total> must be at least one, although only values
10169 greater than one really do make any sense.
10171 You can repeat this option to match multiple groups, for example:
10176 The above config will divide the data into seven groups and match groups three
10177 and five. One use would be to keep every value on two hosts so that if one
10178 fails the missing data can later be reconstructed from the second host.
10184 # Operate on the pre-cache chain, so that ignored values are not even in the
10189 # Divide all received hosts in seven groups and accept all hosts in
10193 # If matched: Return and continue.
10196 # If not matched: Return and stop.
10202 =head2 Available targets
10206 =item B<notification>
10208 Creates and dispatches a notification.
10214 =item B<Message> I<String>
10216 This required option sets the message of the notification. The following
10217 placeholders will be replaced by an appropriate value:
10225 =item B<%{plugin_instance}>
10229 =item B<%{type_instance}>
10231 These placeholders are replaced by the identifier field of the same name.
10233 =item B<%{ds:>I<name>B<}>
10235 These placeholders are replaced by a (hopefully) human readable representation
10236 of the current rate of this data source. If you changed the instance name
10237 (using the B<set> or B<replace> targets, see below), it may not be possible to
10238 convert counter values to rates.
10242 Please note that these placeholders are B<case sensitive>!
10244 =item B<Severity> B<"FAILURE">|B<"WARNING">|B<"OKAY">
10246 Sets the severity of the message. If omitted, the severity B<"WARNING"> is
10253 <Target "notification">
10254 Message "Oops, the %{type_instance} temperature is currently %{ds:value}!"
10260 Replaces parts of the identifier using regular expressions.
10266 =item B<Host> I<Regex> I<Replacement>
10268 =item B<Plugin> I<Regex> I<Replacement>
10270 =item B<PluginInstance> I<Regex> I<Replacement>
10272 =item B<TypeInstance> I<Regex> I<Replacement>
10274 =item B<MetaData> I<String> I<Regex> I<Replacement>
10276 =item B<DeleteMetaData> I<String> I<Regex>
10278 Match the appropriate field with the given regular expression I<Regex>. If the
10279 regular expression matches, that part that matches is replaced with
10280 I<Replacement>. If multiple places of the input buffer match a given regular
10281 expression, only the first occurrence will be replaced.
10283 You can specify each option multiple times to use multiple regular expressions
10291 # Replace "example.net" with "example.com"
10292 Host "\\<example.net\\>" "example.com"
10294 # Strip "www." from hostnames
10295 Host "\\<www\\." ""
10300 Sets part of the identifier of a value to a given string.
10306 =item B<Host> I<String>
10308 =item B<Plugin> I<String>
10310 =item B<PluginInstance> I<String>
10312 =item B<TypeInstance> I<String>
10314 =item B<MetaData> I<String> I<String>
10316 Set the appropriate field to the given string. The strings for plugin instance,
10317 type instance, and meta data may be empty, the strings for host and plugin may
10318 not be empty. It's currently not possible to set the type of a value this way.
10320 The following placeholders will be replaced by an appropriate value:
10328 =item B<%{plugin_instance}>
10332 =item B<%{type_instance}>
10334 These placeholders are replaced by the identifier field of the same name.
10336 =item B<%{meta:>I<name>B<}>
10338 These placeholders are replaced by the meta data value with the given name.
10342 Please note that these placeholders are B<case sensitive>!
10344 =item B<DeleteMetaData> I<String>
10346 Delete the named meta data field.
10353 PluginInstance "coretemp"
10354 TypeInstance "core3"
10359 =head2 Backwards compatibility
10361 If you use collectd with an old configuration, i.E<nbsp>e. one without a
10362 B<Chain> block, it will behave as it used to. This is equivalent to the
10363 following configuration:
10365 <Chain "PostCache">
10369 If you specify a B<PostCacheChain>, the B<write> target will not be added
10370 anywhere and you will have to make sure that it is called where appropriate. We
10371 suggest to add the above snippet as default target to your "PostCache" chain.
10375 Ignore all values, where the hostname does not contain a dot, i.E<nbsp>e. can't
10390 B<Ignorelists> are a generic framework to either ignore some metrics or report
10391 specific metircs only. Plugins usually provide one or more options to specify
10392 the items (mounts points, devices, ...) and the boolean option
10397 =item B<Select> I<String>
10399 Selects the item I<String>. This option often has a plugin specific name, e.g.
10400 B<Sensor> in the C<sensors> plugin. It is also plugin specific what this string
10401 is compared to. For example, the C<df> plugin's B<MountPoint> compares it to a
10402 mount point and the C<sensors> plugin's B<Sensor> compares it to a sensor name.
10404 By default, this option is doing a case-sensitive full-string match. The
10405 following config will match C<foo>, but not C<Foo>:
10409 If I<String> starts and ends with C</> (a slash), the string is compiled as a
10410 I<regular expression>. For example, so match all item starting with C<foo>, use
10411 could use the following syntax:
10415 The regular expression is I<not> anchored, i.e. the following config will match
10416 C<foobar>, C<barfoo> and C<AfooZ>:
10420 The B<Select> option may be repeated to select multiple items.
10422 =item B<IgnoreSelected> B<true>|B<false>
10424 If set to B<true>, matching metrics are I<ignored> and all other metrics are
10425 collected. If set to B<false>, matching metrics are I<collected> and all other
10426 metrics are ignored.
10433 L<collectd-exec(5)>,
10434 L<collectd-perl(5)>,
10435 L<collectd-unixsock(5)>,
10448 Florian Forster E<lt>octo@collectd.orgE<gt>