Munin contributed plugins

#!/usr/bin/perl -w

#

# Copyright (C) 2006 Lars Strand

#

# Munin plugin to monitor CPU-load by use of SNMP.

# Based on snmp__df plugin.

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; version 2 dated June,

# 1991.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#

# $Log$

#

#

#

#%# family=snmpauto

#%# capabilities=snmpconf

use strict;

use Net::SNMP;

my $DEBUG = 0;

my $host      = $ENV{host}      || undef;

my $port      = $ENV{port}      || 161;

my $community = $ENV{community} || "public";

my $response;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf")

{

    print "index 1.3.6.1.2.1.25.3.3.1.2.\n";

    print "require 1.3.6.1.2.1.25.3.3.1.2.1\n"; # CPU #1

    exit 0;

}

if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_cpu$/)

{

    $host  = $1;

    if ($host =~ /^([^:]+):(\d+)$/)

    {

	$host = $1;

	$port = $2;

    }

}

elsif (!defined($host))

{

    print "# Debug: $0 -- $1\n" if $DEBUG;

    die "# Error: couldn't understand what I'm supposed to monitor.";

}

my ($session, $error) = Net::SNMP->session(

    -hostname  => $host,

    -community => $community,

    -port      => $port

    );

if (!defined ($session))

{

    die "Croaking: $error";

}

# CPUs

my $hrProcessorLoad = "1.3.6.1.2.1.25.3.3.1.2.";

$response = $session->get_table($hrProcessorLoad);

if (!defined ($response))

{

    die "Croaking: $error";

}

if (defined $ARGV[0] and $ARGV[0] eq "config")

{

    print "host_name $host\n";

    print "graph_title CPU usage (in %)

graph_category system

graph_args --upper-limit 100 -l 0 

graph_vlabel % 

graph_info This graph shows the CPU load on the system.

";

    foreach my $cpuoid (keys %$response) {

	my @oid = split(/\./, $cpuoid);

	my $cpu = pop @oid;

	print "cpu$cpu.label CPU $cpu\n";

	print "cpu$cpu.info CPU load on CPU $cpu\n";

    }

    exit 0;

}

# the values

while (my ($cpuoid, $load) = each(%$response)) {

    my @oid = split(/\./, $cpuoid);

    my $cpu = pop @oid;

    print "cpu$cpu.value $load\n";

}