123 lines
2.8 KiB
Text
123 lines
2.8 KiB
Text
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#!/usr/bin/perl -w
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# -*- perl -*-
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=head1 NAME
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docker_cpu - Munin plugin to monitor docker container CPU usage.
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=head1 APPLICABLE SYSTEMS
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Should work on any Linux system that has docker support.
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=head1 CONFIGURATION
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Root privilege required to execute docker command.
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1. Create a new file named "docker" inside the folder /etc/munin/plugin-conf.d/
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2. Docker file content:
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[docker_cpu]
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user root
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=head1 MAGIC MARKERS
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#%# family=auto
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#%# capabilities=autoconf
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=head1 VERSION
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v.0.1
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=head1 AUTHOR
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Copyright (C) 2015 Samuel Cantero <scanterog at gmail dot com>
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=head1 LICENSE
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GPLv3
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=cut
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my $docker=`which docker`;
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if ( defined $ARGV[0] and $ARGV[0] eq "autoconf" ) {
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if ($docker) {
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print "yes\n";
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exit 0;
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}
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else{
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print "no (Docker has not been found)\n";
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exit 0;
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}
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}
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$docker =~ s/\s+$//;
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my @containers = split "\n" , `$docker ps --no-trunc=true`;
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my $result;
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for my $i (1 .. $#containers)
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{
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my @fields = split / +/, $containers[$i];
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my $id = $fields[0];
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my $name = $fields[$#fields];
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my $label = $name;
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# manage container name containing arithmetic operators and dots. E.g, my-container.
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$name =~ s/[-\+*\/\.]/_/g;
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# truncate container name with "," character.
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$name =~ s/,.*//g;
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# prefix if container starts with 0-9
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$name =~ s/^([0-9])/c$1/;
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if (open(my $file, '<', "/sys/fs/cgroup/cpuacct/docker/$id/cpuacct.usage"))
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{
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my $total_cpu_ns = <$file>;
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$total_cpu_ns =~ s/\s+$//;
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close $file;
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if (open($file, '<', "/sys/fs/cgroup/cpuacct/docker/$id/cpuacct.usage_percpu"))
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{
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my @ncpu = split / /, <$file>;
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close $file;
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push @result, {'name'=>$name, 'label'=>$label, 'total_cpu_ns'=>$total_cpu_ns, 'ncpu'=>$#ncpu};
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}
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}
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}
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if (defined $ARGV[0] and $ARGV[0] eq "config")
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{
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my $nanoSecondsInSecond=1000000000;
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my $graphlimit = 1;
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foreach(@result){
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if ($$_{'ncpu'} || 1 > $graphlimit){
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$graphlimit = $$_{'ncpu'};
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}
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}
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$graphlimit = $graphlimit * 100;
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print "graph_title Docker container CPU usage\n";
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print "graph_args --base 1000 -r --lower-limit 0 --upper-limit $graphlimit\n";
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print "graph_vlabel %\n";
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print "graph_scale no\n";
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print "graph_period second\n";
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print "graph_category virtualization\n";
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print "graph_info This graph shows docker container CPU usage.\n";
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foreach(@result)
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{
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print "$$_{'name'}.label $$_{'label'}\n";
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print "$$_{'name'}.draw LINE2\n";
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print "$$_{'name'}.min 0\n";
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print "$$_{'name'}.type DERIVE\n";
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print "$$_{'name'}.cdef $$_{'name'},$nanoSecondsInSecond,/\n";
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}
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exit 0;
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}
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# Note: Counters/derive need to report integer values.
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foreach(@result)
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{
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$tcpu = ($$_{'total_cpu_ns'}*100); #to percentage
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print "$$_{'name'}.value $tcpu\n";
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}
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# vim:syntax=perl
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