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#!/usr/bin/perl -wT
#
# Script to minitor the cpu usage of Xen domains
#
# Author: Adam Crews <doo <at> shroom <dot> com>
#
# License: GPL
# Based on the origional xen script from Matthias Pfafferodt, syntron at web.de
#
# Note: Your munin config must run this as root.
#
# Parameters
# config (required)
# autoconf (optional - used by munin-config)
#
#%# family=auto
#%# capabilities=autoconf
# Define where to find xm tools
my $XM = '/usr/sbin/xm';
my $XMTOP = '/usr/sbin/xentop';
##############
# You should not need to edit anything below here
#
use strict;
$ENV{PATH} = '/bin:/usr/bin:/usr/sbin';
my $arg; undef($arg);
if (defined($ARGV[0])) {
$arg = 'config' if ($ARGV[0] eq 'config');
$arg = 'autoconf' if ($ARGV[0] eq 'autoconf');
if ( "$arg" eq 'autoconf') {
if ( -e $XM && -e $XMTOP ) {
print "yes\n";
exit 0;
} else {
print "no ($XM and/or $XMTOP not found\n";
exit 1;
}
}
if ( "$arg" eq 'config') {
my %cnf; undef(%cnf);
%cnf = (
'graph_title' => 'Xen Domain CPU Usage',
'graph_args' => '--base 1000 -l 0 --upper-limit 100 --rigid',
'graph_vlabel' => 'Percent (%)',
'graph_category' => 'xen',
'graph_info' => 'Display the % of CPU Usage for each domain',
);
my @domains = `$XM list`;
shift(@domains); # we dont need the header line
my $cnt = "0";
foreach my $domain ( @domains ) {
my ($dom,undef) = split(/\s/, $domain, 2);
# we need to change - and . to _ or things get weird with the graphs
# some decent quoting would probably fix this, but this works for now
$dom =~ s/[-.]/_/g;
$cnf{ "$dom" . '.label' } = "$dom";
$cnf{ "$dom" . '.draw' } = 'STACK';
$cnf{ "$dom" . '.min' } = '0';
$cnf{ "$dom" . '.max' } = '100';
$cnf{ "$dom" . '.info' } = '% CPU used for ' . "$dom";
if ( "$cnt" == "0") { $cnf{$dom.'.draw'} = 'AREA'; }
$cnt++;
}
foreach my $key (sort(keys(%cnf))) {
print "$key $cnf{$key}\n";
}
exit 0;
}
}
# Nothing was passed as an argument, so let's just return the proper values
my @chunks; undef(@chunks);
{
# run the xentop command a few times because the first reading is not always accurate
local $/ = undef;
@chunks = split(/^xentop - .*$/m, `$XMTOP -b -i2 -d2`);
}
# Take only the last run of xentop
my @stats = split (/\n/,pop(@chunks));
# remove the first 4 items that are junk that we don't need.
shift(@stats);
shift(@stats);
shift(@stats);
shift(@stats);
my %vals; undef(%vals);
foreach my $domain (@stats) {
# trim the leading whitespace
$domain =~ s/^\s+//;
my @v_tmp = split(/\s+/, $domain);
# we need to change - and . to _ or things get weird with the graphs
# some decent quoting would probably fix this, but this works for now
$v_tmp[0] =~ s/[-.]/_/g;
$vals{$v_tmp[0]}{'cpu_percent'} = $v_tmp[3];
$vals{$v_tmp[0]}{'vcpu'} = $v_tmp[8];
if ( $vals{$v_tmp[0]}{'vcpu'} =~ m/n\/a/ ) {
my $cpu = `grep -c "processor" < /proc/cpuinfo`;
if ( $cpu =~ m/^(\d+)$/ ) {
$vals{$v_tmp[0]}{'vcpu'} = $1;
}
}
}
foreach my $key (sort(keys(%vals))) {
print "$key.value " . ($vals{$key}{'cpu_percent'}/$vals{'Domain_0'}{'vcpu'}), "\n";
}
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