1 =head1 NAME
3 collectdctl - Control interface for collectd
5 =head1 SYNOPSIS
7 collectdctl I<[options]> I<E<lt>commandE<gt>> I<[command options]>
9 =head1 DESCRIPTION
11 collectdctl provides a control interface for collectd, which may be used to
12 interact with the daemon using the C<unixsock plugin>.
14 =head1 OPTIONS
16 collectdctl supports the following options:
18 =over 4
20 =item B<-s> I<socket>
22 Path to the UNIX socket opened by collectd's C<unixsock plugin>.
23 Default: /var/run/collectd-unixsock
25 =item B<-h>
27 Display usage information and exit.
29 =back
31 =head1 AVAILABLE COMMANDS
33 The following commands are supported:
35 =over 4
37 =item B<getval> I<E<lt>identifierE<gt>>
39 Query the latest collected value identified by the specified
40 I<E<lt>identifierE<gt>> (see below). The value-list associated with that
41 data-set is returned as a list of key-value-pairs, each on its own line. Keys
42 and values are separated by the equal sign (C<=>).
44 =item B<flush> [B<timeout=>I<E<lt>secondsE<gt>>] [B<plugin=>I<E<lt>nameE<gt>>]
45 [B<identifier=>I<E<lt>idE<gt>>]
47 Flush the daemon. This is useful, e.E<nbsp>g., to make sure that the latest
48 values have been written to the respective RRD file before graphing them or
49 copying them to somewhere else.
51 The following options are supported by the flush command:
53 =over 4
55 =item B<timeout=>I<E<lt>secondsE<gt>>
57 Flush values older than the specified timeout (in seconds) only.
59 =item B<plugin=>I<E<lt>nameE<gt>>
61 Flush the specified plugin only. I.E<nbsp>e., data cached by the specified
62 plugin is written to disk (or network or whatever), if the plugin supports
63 that operation.
65 Example: B<rrdtool>.
67 =item B<identifier=>I<E<lt>idE<gt>>
69 If this option is present, only the data specified by the specified identifier
70 (see below) will be flushed. Note that this option is not supported by all
71 plugins (e.E<nbsp>g., the C<network> plugin does not support this).
73 =back
75 The B<plugin> and B<identifier> options may be specified more than once. In
76 that case, all combinations of specified plugins and identifiers will be
77 flushed only.
79 =item B<listval>
81 Returns a list of all values (by their identifier) available to the
82 C<unixsock> plugin. Each value is printed on its own line. I.E<nbsp>e., this
83 command returns a list of valid identifiers that may be used with the other
84 commands.
86 =item B<putval> I<E<lt>identifierE<gt>> [B<interval=>I<E<lt>secondsE<gt>>]
87 I<E<lt>value-list(s)E<gt>>
89 Submit one or more values (identified by I<E<lt>identifierE<gt>>, see below)
90 to the daemon which will then dispatch them to the write plugins. B<interval>
91 specifies the interval (in seconds) used to collect the values following that
92 option. It defaults to the default of the running collectd instance receiving
93 the data. Multiple I<E<lt>value-list(s)E<gt>> (see below) may be specified.
94 Each of them will be submitted to the daemon. The values have to match the
95 data-set definition specified by the type as given in the identifier (see
96 L<types.db(5)> for details).
98 =back
100 =head1 IDENTIFIERS
102 An identifier has the following format:
104 [I<hostname>/]I<plugin>[-I<plugin_instance>]/I<type>[-I<type_instance>]
106 Examples:
107 somehost/cpu-0/cpu-idle
108 uptime/uptime
109 otherhost/memory/memory-used
111 Hostname defaults to the local (non-fully qualified) hostname if omitted. No
112 error is returned if the specified identifier does not exist (this is a
113 limitation in the C<libcollectdclient> library).
115 =head1 VALUE-LIST
117 A value list describes one data-set as handled by collectd. It is a colon
118 (C<:>) separated list of the time and the values. Each value is either given
119 as an integer if the data-type is a counter, or as a double if the data-type
120 is a gauge value. A literal C<U> is interpreted as an undefined gauge value.
121 The number of values and the data-types have to match the type specified in
122 the identifier (see L<types.db(5)> for details). The time is specified as
123 epoch (i.E<nbsp>e., standard UNIX time) or as a literal C<N> which will be
124 interpreted as now.
126 =head1 EXAMPLES
128 =over 4
130 =item C<collectdctl flush plugin=rrdtool identifier=somehost/cpu-0/cpu-wait>
132 Flushes all CPU wait RRD values of the first CPU of the local host.
133 I.E<nbsp>e., writes all pending RRD updates of that data-source to disk.
135 =item C<for ident in `collectdctl listval | grep users/users`; do
136 collectdctl getval $ident;
137 done>
139 Query the latest number of logged in users on all hosts known to the local
140 collectd instance.
142 =back
144 =head1 SEE ALSO
146 L<collectd(1)>,
147 L<collectd.conf(5)>,
148 L<collectd-unixsock(5)>,
149 L<types.db(5)>
151 =head1 AUTHOR
153 collectd has been written by Florian Forster E<lt>octo at verplant.orgE<gt>
154 and many contributors (see `AUTHORS').
156 collectdctl has been written by
157 HÃ¥kon J Dugstad Johnsen E<lt>hakon-dugstad.johnsenE<nbsp>atE<nbsp>telenor.comE<gt>
158 and Sebastian Harl E<lt>sh at tokkee.orgE<gt>.
160 =cut