src/collectd.pod

   1 =head1 NAME
   2
   3 collectd - System statistics collection daemon
   4
   5 =head1 SYNOPSIS
   6
   7 collectd I<[options]>
   8
   9 =head1 DESCRIPTION
  10
  11 collectd is a daemon that collects various system statistics periodically and
  12 stores them into RRD-files. Which data is collected depends on compile-time
  13 settings. The following features may be available:
  14
  15 =over 4
  16
  17 =item
  18
  19 Battery status (I<battery>)
  20
  21 =item
  22
  23 CPU utilization (I<cpu>)
  24
  25 =item
  26
  27 Mountpoint usage (I<df>)
  28
  29 =item
  30
  31 Disk and partition usage/throughput (I<disk>)
  32
  33 =item
  34
  35 Harddisk temperatures (I<hddtemp>)
  36
  37 =item
  38
  39 System load averages (I<load>)
  40
  41 =item
  42
  43 Memory usage (I<memory>)
  44
  45 =item
  46
  47 MySQL statistics (I<mysql>)
  48
  49 =item
  50
  51 NFS utilization (I<nfs>, Linux only)
  52
  53 =item
  54
  55 Network latency (I<ping>)
  56
  57 =item
  58
  59 Number of processes (I<processes>, Linux only)
  60
  61 =item
  62
  63 lm_sensors information (I<sensors>, Linux only)
  64
  65 =item
  66
  67 Serial port traffic (I<serial>, Linux only)
  68
  69 =item
  70
  71 Swap usage (I<swap>)
  72
  73 =item
  74
  75 Tape drive usage (I<tape>, Solaris only)
  76
  77 =item
  78
  79 Network traffic (I<traffic>)
  80
  81 =item
  82
  83 Number of users logged into the system (I<users>)
  84
  85 =item
  86
  87 System ressources used by VServers (I<vserver>)
  88
  89 =back
  90
  91 =head1 OPTIONS
  92
  93 =over 4
  94
  95 =item B<-C> I<E<lt>config-fileE<gt>>
  96
  97 Specify an alternative config file. This is the place to go when you wish to
  98 change B<collectd>'s behavior. The path may be relative to the current working
  99 directory.
 100
 101 =item B<-f>
 102
 103 Don't fork to the background. I<collectd> will also B<not> close standard file
 104 descriptors, detach from the session nor write a pid file. This is mainly
 105 thought for 'supervisioning' init replacements such as I<runit>.
 106
 107 =item B<-h>
 108
 109 Output usage information and exit.
 110
 111 =back
 112
 113 =head1 MODES
 114
 115 collectd can operate in three different operating modes. The modes are
 116 described below.
 117
 118 The simplest mode is the so called B<local mode>. Data is collected locally and
 119 written in RRD files that reside in I<DataDir>. This is the default mode when
 120 collectd is linked against C<librrd>.
 121
 122 The other two modes, B<client mode> and B<server mode>, are used to send data
 123 over a network and receive it again.
 124
 125 In B<client mode> the daemon collectd the data locally and send it's result to
 126 one or more network addresses. No RRD files are written in this case. This is
 127 the only mode available if collectd is not linked against C<librrd>.
 128
 129 If started in B<server mode> the daemon will listen on one or more interfaces
 130 and write the data it receives to RRD files. No data is collected locally.
 131
 132 Please refer to L<collectd.conf(5)> for the configuration options and default
 133 values.
 134
 135 =head1 SPECIAL PLUGINS
 136
 137 =head2 cpufreq
 138
 139 This module reads F</sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq> (for
 140 the first CPU installed) to get the current CPU frequency. If this file does
 141 not exist make sure B<cpufreqd> (L<http://cpufreqd.sourceforge.net/>) or a
 142 similar tool is installed.
 143
 144 =head2 mysql
 145
 146 Requires B<mysqlclient> to be installed. It connects to the database when
 147 started and keeps the connection up as long as possible. When the connection is
 148 interrupted for whatever reason it will try to re-connect. The syslog will
 149 contain loud complaints in case anything goes wrong.
 150
 151 This plugin issues C<SHOW STATUS> and evaluates C<Bytes_{received,sent}>,
 152 C<Com_*> and C<Handler_*> which correspond to F<traffic-mysql.rrd>,
 153 F<mysql_commands-*.rrd> and F<mysql_handler-*.rrd>. Also, the values of
 154 C<Qcache_*> are put in F<mysql_qcache.rrd> and values of C<Threads_*> are put
 155 in F<mysql_threads.rrd>. Please refer to the B<MySQL reference manual>,
 156 I<5.2.4. Server Status Variables> for an explanation of these values.
 157
 158 =head2 sensors
 159
 160 The B<sensors> module uses lm_sensors to retrieve sensor-values. This means
 161 that all the needed modules have to be loaded and lm_sensors has to be
 162 configured (most likely by editing F</etc/sensors.conf>. Read
 163 L<sensors.conf(5)> for details.
 164
 165 The B<lm_sensors> homepage can be found at
 166 L<http://secure.netroedge.com/~lm78/>.
 167
 168 =head2 hddtemp
 169
 170 To get values from B<hddtemp> collectd connects to B<localhost> (127.0.0.1),
 171 port B<7634/tcp>. The B<Host> and B<Port> options can be used to change these
 172 default values. See L<collectd.conf(5)> for details. C<hddtemp> has to be
 173 running to work correctly. If C<hddtemp> is not running timeouts may appear
 174 which may interfere with other statistics..
 175
 176 The B<hddtemp> homepage can be found at
 177 L<http://www.guzu.net/linux/hddtemp.php>.
 178
 179 =head2 vserver
 180
 181 B<VServer> support is only available for Linux. It cannot yet be found in a
 182 vanilla kernel, though. To make use of this plugin you need a kernel that has
 183 B<VServer> support built in, i.e. you need to apply the patches and compile
 184 your own kernel, which will then provide the /proc/virtual filesystem that is
 185 required by this plugin.
 186
 187 The B<VServer> homepage can be found at L<http://linux-vserver.org/>.
 188
 189 =head1 RRD FILES
 190
 191 The RRD files are created automatically with the following RRAs:
 192
 193   RRA:AVERAGE:0.2:6:1500
 194   RRA:AVERAGE:0.1:180:1680
 195   RRA:AVERAGE:0.1:2160:1520
 196   RRA:MIN:0.2:6:1500
 197   RRA:MIN:0.1:180:1680
 198   RRA:MIN:0.1:2160:1520
 199   RRA:MAX:0.2:6:1500
 200   RRA:MAX:0.1:180:1680
 201   RRA:MAX:0.1:2160:1520
 202
 203 Since collectd uses a 10 second I<step> the RRAs contain the following
 204 timespans:
 205
 206   Resolution | Data points |  Timespan
 207   -----------+-------------+----------
 208   60 seconds |        1500 |  25 hours
 209   30 minutes |        1680 |  35 days
 210    6 hours   |        1520 | 380 days
 211
 212 The DS'es depend on the module creating the RRD files:
 213
 214 =over 4
 215
 216 =item Battery charge (F<battery-I<E<lt>nameE<gt>>/charge.rrd>)
 217
 218   DS:charge:GAUGE:25:0:U
 219
 220 =item Battery current (F<battery-I<E<lt>nameE<gt>>/current.rrd>)
 221
 222   DS:current:GAUGE:25:U:U
 223
 224 =item Battery voltage (F<battery-I<E<lt>nameE<gt>>/voltage.rrd>)
 225
 226   DS:voltage:GAUGE:25:U:U
 227
 228 =item CPU (F<cpu-I<E<lt>numE<gt>>.rrd>)
 229
 230   DS:user:COUNTER:25:0:100
 231   DS:nice:COUNTER:25:0:100
 232   DS:syst:COUNTER:25:0:100
 233   DS:idle:COUNTER:25:0:100
 234   DS:wait:COUNTER:25:0:100
 235
 236 =item Mountpoints (F<df-I<E<lt>pathE<gt>>.rrd>)
 237
 238   DS:used:GAUGE:25:0:U
 239   DS:free:GAUGE:25:0:U
 240
 241 =item Diskstats (F<disk-I<E<lt>majorE<gt>>-I<E<lt>minorE<gt>>.rrd>)
 242
 243   DS:rcount:COUNTER:25:0:U
 244   DS:rmerged:COUNTER:25:0:U
 245   DS:rbytes:COUNTER:25:0:U
 246   DS:rtime:COUNTER:25:0:U
 247   DS:wcount:COUNTER:25:0:U
 248   DS:wmerged:COUNTER:25:0:U
 249   DS:wbytes:COUNTER:25:0:U
 250   DS:wtime:COUNTER:25:0:U
 251
 252 =item Diskstats (F<partition-I<E<lt>majorE<gt>>-I<E<lt>minorE<gt>>.rrd>)
 253
 254   DS:rcount:COUNTER:25:0:U
 255   DS:rbytes:COUNTER:25:0:U
 256   DS:wcount:COUNTER:25:0:U
 257   DS:wbytes:COUNTER:25:0:U
 258
 259 =item HDD Temperature (F<hddtemp-I<E<lt>majorE<gt>>-I<E<lt>minorE<gt>>.rrd>)
 260
 261   DS:value:GAUGE:25:U:U
 262
 263 =item System load (F<load.rrd>)
 264
 265   DS:shortterm:GAUGE:25:0:100
 266   DS:midterm:GAUGE:25:0:100
 267   DS:longterm:GAUGE:25:0:100
 268
 269 =item Memory usage (F<memory.rrd>)
 270
 271   DS:used:GAUGE:25:0:9223372036854775807
 272   DS:free:GAUGE:25:0:9223372036854775807
 273   DS:buffers:GAUGE:25:0:9223372036854775807
 274   DS:cached:GAUGE:25:0:9223372036854775807
 275
 276 =item MySQL commands and handlers (F<mysql_commands-I<E<lt>commandE<gt>>.rrd> and F<mysql_handler-I<E<lt>handlerE<gt>>.rrd>)
 277
 278   DS:value:COUNTER:25:0:U
 279
 280 =item MySQL query cache (F<mysql_qcache.rrd>)
 281
 282   DS:hits:COUNTER:25:0:U
 283   DS:inserts:COUNTER:25:0:U
 284   DS:not_cached:COUNTER:25:0:U
 285   DS:lowmem_prunes:COUNTER:25:0:U
 286   DS:queries_in_cache:GAUGE:25:0:U
 287
 288 =item MySQL threads (F<mysql_threads.rrd>)
 289
 290   DS:running:GAUGE:25:0:U
 291   DS:connected:GAUGE:25:0:U
 292   DS:cached:GAUGE:25:0:U
 293   DS:created:COUNTER:25:0:U
 294
 295 =item NFSv2 Procedures (F<nfs2_procedures-I<(client|server)>.rrd>)
 296
 297   DS:null:COUNTER:25:0:U
 298   DS:getattr:COUNTER:25:0:U
 299   DS:setattr:COUNTER:25:0:U
 300   DS:root:COUNTER:25:0:U
 301   DS:lookup:COUNTER:25:0:U
 302   DS:readlink:COUNTER:25:0:U
 303   DS:read:COUNTER:25:0:U
 304   DS:wrcache:COUNTER:25:0:U
 305   DS:write:COUNTER:25:0:U
 306   DS:create:COUNTER:25:0:U
 307   DS:remove:COUNTER:25:0:U
 308   DS:rename:COUNTER:25:0:U
 309   DS:link:COUNTER:25:0:U
 310   DS:symlink:COUNTER:25:0:U
 311   DS:mkdir:COUNTER:25:0:U
 312   DS:rmdir:COUNTER:25:0:U
 313   DS:readdir:COUNTER:25:0:U
 314   DS:fsstat:COUNTER:25:0:U
 315
 316 =item NFSv3 Procedures (F<nfs3_procedures-I<(client|server)>.rrd>)
 317
 318   DS:null:COUNTER:25:0:U
 319   DS:getattr:COUNTER:25:0:U
 320   DS:setattr:COUNTER:25:0:U
 321   DS:lookup:COUNTER:25:0:U
 322   DS:access:COUNTER:25:0:U
 323   DS:readlink:COUNTER:25:0:U
 324   DS:read:COUNTER:25:0:U
 325   DS:write:COUNTER:25:0:U
 326   DS:create:COUNTER:25:0:U
 327   DS:mkdir:COUNTER:25:0:U
 328   DS:symlink:COUNTER:25:0:U
 329   DS:mknod:COUNTER:25:0:U
 330   DS:remove:COUNTER:25:0:U
 331   DS:rmdir:COUNTER:25:0:U
 332   DS:rename:COUNTER:25:0:U
 333   DS:link:COUNTER:25:0:U
 334   DS:readdir:COUNTER:25:0:U
 335   DS:readdirplus:COUNTER:25:0:U
 336   DS:fsstat:COUNTER:25:0:U
 337   DS:fsinfo:COUNTER:25:0:U
 338   DS:pathconf:COUNTER:25:0:U
 339   DS:commit:COUNTER:25:0:U
 340
 341 =item Network latency / Ping (F<ping-I<E<lt>hostnameE<gt>>.rrd>)
 342
 343   DS:ping:GAUGE:25:0:65535
 344
 345 =item Processes (F<processes.rrd>)
 346
 347   DS:running:GAUGE:25:0:65535
 348   DS:sleeping:GAUGE:25:0:65535
 349   DS:zombies:GAUGE:25:0:65535
 350   DS:stopped:GAUGE:25:0:65535
 351   DS:paging:GAUGE:25:0:65535
 352   DS:blocked:GAUGE:25:0:65535
 353
 354 =item lm_sensors (F<sensors-I<E<lt>chipE<gt>>-I<E<lt>featureE<gt>>.rrd>)
 355
 356   DS:value:GAUGE:25:U:U
 357
 358 =item Serial port traffic (F<serial-I<E<lt>numE<gt>>.rrd>)
 359
 360   DS:incoming:COUNTER:25:0:U
 361   DS:outgoing:COUNTER:25:0:U
 362
 363 =item Swap usage (F<swap.rrd>)
 364
 365   DS:used:GAUGE:25:0:1099511627776
 366   DS:free:GAUGE:25:0:1099511627776
 367   DS:cached:GAUGE:25:0:1099511627776
 368   DS:resv:GAUGE:25:0:1099511627776
 369
 370 =item Tape drive usage (F<tape-I<E<lt>nameE<gt>>.rrd>)
 371
 372   DS:rcount:COUNTER:25:0:
 373   DS:rmerged:COUNTER:25:0:U
 374   DS:rbytes:COUNTER:25:0:U
 375   DS:rtime:COUNTER:25:0:U
 376   DS:wcount:COUNTER:25:0:U
 377   DS:wmerged:COUNTER:25:0:U
 378   DS:wbytes:COUNTER:25:0:U
 379   DS:wtime:COUNTER:25:0:U
 380
 381 =item Network traffic (F<traffic-I<E<lt>nameE<gt>>.rrd>)
 382
 383   DS:incoming:COUNTER:25:0:U
 384   DS:outgoing:COUNTER:25:0:U
 385
 386 =item Users (F<users.rrd>)
 387
 388   DS:users:GAUGE:25:0:65535
 389
 390 =item VServer load (F<vserver-I<E<lt>xidE<gt>>/load.rrd>)
 391
 392   DS:shortterm:GAUGE:25:0:100
 393   DS:midterm:GAUGE:25:0:100
 394   DS:longterm:GAUGE:25:0:100
 395
 396 =item VServer threads (F<vserver-I<E<lt>xidE<gt>>/threads.rrd>)
 397
 398   DS:total:GAUGE:25:0:65535
 399   DS:running:GAUGE:25:0:65535
 400   DS:uninterruptible:GAUGE:25:0:65535
 401   DS:onhold:GAUGE:25:0:65535
 402
 403 =item VServer network traffic (F<vserver-I<E<lt>xidE<gt>>/traffic-I<E<lt>nameE<gt>>.rrd>)
 404
 405   DS:incoming:COUNTER:25:0:9223372036854775807
 406   DS:outgoing:COUNTER:25:0:9223372036854775807
 407   DS:failed:COUNTER:25:0:9223372036854775807
 408
 409 =item VServer processes (F<vserver-I<E<lt>xidE<gt>>/vs_processes.rrd>)
 410
 411   DS:total:GAUGE:25:0:65535
 412
 413 =item VServer memory usage (F<vserver-I<E<lt>xidE<gt>>/vs_memory.rrd>)
 414
 415   DS:vm:GAUGE:25:0:9223372036854775807
 416   DS:vml:GAUGE:25:0:9223372036854775807
 417   DS:rss:GAUGE:25:0:9223372036854775807
 418   DS:anon:GAUGE:25:0:9223372036854775807
 419
 420 =back
 421
 422 =head1 SEE ALSO
 423
 424 L<collectd.conf(5)>, L<rrdtool(1)>, L<sensors(1)>, L<hddtemp(8)>,
 425 L<kstat(3KSTAT)>
 426
 427 =head1 AUTHOR
 428
 429 Florian Forster E<lt>octo@verplant.orgE<gt>
 430
 431 =cut