=item
-Apache
server stats (I<apache>)
+Apache
and lighttpd server statistics (I<apache>)
=item
=item
+Irq (I<irq>)
+
+=item
+
System load averages (I<load>)
=item
=head2 apache
-This module connects to an Apache webserver and expects the output produced by
-B<mod_status.c>. If requires B<libcurl> to set up the HTTP connection and issue
-the request(s). The following is a sample config for the Apache webserver. The
-use of C<ExtendedStatus on> is mandatory.
+This module connects to an Apache or lighttpd webserver and expects the output
+produced by B<mod_status.c>. If requires B<libcurl> to set up the HTTP
+connection and issue the request(s). The following is a sample config for the
+Apache webserver. Under Apache, the use of C<ExtendedStatus on> is mandatory.
ExtendedStatus on
<IfModule mod_status.c>
e:<type>:<size>
+If C<size> is less than or equal to zero, C<size> is ignored.
+
Spam score:
s:<value>
Each line is limited to 256 characters (including the newline character).
Longer lines will be ignored.
+=head2 exec
+
+The C<exec> plugin forks of an executable and reads back values that it writes
+to C<STDOUT>. The executable is forked kind of as L<init> does: It is forked
+once and not again until it exits. If it exited, it will be forked again after
+at most I<Interval> seconds. It is perfectly legal for the executable to run
+for a long time and continuously write values to C<STDOUT>.
+
+The forked executable is expected to print values to C<STDOUT>. The expected
+format is as follows:
+
+=over 4
+
+=item
+
+Each line beginning with a C<#> (hash mark) is ignored.
+
+=item
+
+Any other line must be of the form C<I<type>,I<type-instance>,I<value>>, where
+I<type> is either B<counter> or B<gauge>, I<type-instance> may not contain
+C<,> (comma), C</> (slash) and C<\0> (null byte) and I<value> is either an
+integer (if I<type> is B<counter>) or a floating-point number (if I<type> is
+B<gauge>).
+
+=back
+
+The values are always considered to be "fresh", i.E<nbsp>e. the time is set to
+"now".
+
+When collectd exits it sends a B<SIGTERM> to all still running
+child-processes upon which they have to quit.
+
=head2 mysql
Requires B<mysqlclient> to be installed. It connects to the database when
in F<mysql_threads.rrd>. Please refer to the B<MySQL reference manual>,
I<5.2.4. Server Status Variables> for an explanation of these values.
+=head2 perl
+
+The C<perl plugin> includes a Perl-interpreter in collectd and provides
+Perl-equvalents of the plugin-functions. This makes it possible to write
+plugins in Perl.
+
+There are two more comlex types you need to know about:
+
+=over 4
+
+=item Data-Set
+
+A data-set is a list of one or more data-sources. Each data-source defines a
+name, type, min- and max-value and the data-set wraps them up into one
+structure. The general layout looks like this:
+
+ [{
+ name => 'data_source_name',
+ type => DS_TYPE_COUNTER || DS_TYPE_GAUGE
+ min => value || undef,
+ max => value || undef
+ }, ...]
+
+=item Value-List
+
+A value-list is one structure which features an array of values and fields to
+identify the values, i. e. time and host, plugin name and plugin-instance as
+well as a type and type-instance. Since the "type" is not included in the
+value-list but is passed as an extra argument, the general layout looks like
+this:
+
+ {
+ values => [123, 0.5],
+ time => time (),
+ host => 'localhost',
+ plugin => 'myplugin',
+ plugin_instance => '',
+ type_instance => ''
+ }
+
+=back
+
+The following functions provide the C-interface to Perl-modules:
+
+=over 4
+
+=item B<plugin_register> (I<type>, I<name>, I<data>)
+
+Registers a callback-function or data-set.
+
+I<type> can be one of:
+
+=over 4
+
+=item TYPE_INIT
+
+=item TYPE_READ
+
+=item TYPE_WRITE
+
+=item TYPE_LOG
+
+=item TYPE_SHUTDOWN
+
+=item TYPE_DATASET
+
+=back
+
+I<name> is the name of the callback-function or the type of the data-set,
+depending on the value of I<type>. (Please note that the type of the data-set
+is the value passed as I<name> here and has nothing to do with the I<type>
+argument which simply tells B<plugin_register> what is being registered.)
+
+The last argument, I<data>, is either a function- or an array-reference. If
+I<type> is B<TYPE_DATASET>, then the I<data> argument must be an
+array-reference which points to an array of hashes. Each hash describes one
+data-source. For the exact layout see B<Data-Set> above.
+
+If the I<type> argument is any of the other types (B<TYPE_INIT>, B<TYPE_READ>,
+...) when I<data> is expected to be a funtion reference. These functions are
+called in the various stages of the daemon and are passed the following
+arguments:
+
+=over 4
+
+=item TYPE_INIT
+
+=item TYPE_READ
+
+=item TYPE_SHUTDOWN
+
+No arguments are passed
+
+=item TYPE_WRITE
+
+The arguments passed are I<type>, I<data-set>, and I<value-list>. I<type> is a
+string. For the layout of I<data-set> and I<value-list> see above.
+
+=item TYPE_LOG
+
+The arguments are I<log-level> and I<message>. The log level is small for
+important messages and high for less important messages. The least important
+level is B<LOG_DEBUG>, the most important level is B<LOG_ERR>. In between there
+are (from least to most important): B<LOG_INFO>, B<LOG_NOTICE>, and
+B<LOG_WARNING>. I<message> is simply a string B<without> a newline at the end.
+
+=back
+
+=item B<plugin_unregister> (I<type>, I<plugin>)
+
+Removes a callback or data-set from collectd's internal list of
+functionsE<nbsp>/ datasets.
+
+=item B<plugin_dispatch_values> (I<type>, I<value-list>)
+
+Submits a I<value-list> of type I<type> to the daemon. If the data-set I<type>
+is found (and the number of values matches the number of data-sources) then the
+type, data-set and value-list is passed to all write-callbacks that are
+registered with the daemon.
+
+=item B<plugin_log> (I<log-level>, I<message>)
+
+TODO.
+
+=back
+
=head2 sensors
The B<sensors> module uses lm_sensors to retrieve sensor-values. This means
DS:value:GAUGE:HEARTBEAT:U:U
+=item Irq (F<irq-I<E<lt>irqnumberE<gt>>.rrd>)
+
+ DS:value:COUNTER:HEARTBEAT:0:65535
+
=item System load (F<load.rrd>)
DS:shortterm:GAUGE:HEARTBEAT:0:100
projects / collectd.git / blobdiff