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173 lines
4 KiB
Perl
Executable file
173 lines
4 KiB
Perl
Executable file
#!/usr/bin/perl -w
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#
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# Copyright (C) 2006 Lars Strand
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#
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# Munin plugin to monitor swap usage by use of SNMP.
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# Based on the snmp__df plugin
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2 dated June,
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# 1991.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# $Log$
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#
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#%# family=snmpauto
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#%# capabilities=snmpconf
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use strict;
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use Net::SNMP;
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my $DEBUG = 0;
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my $MAXLABEL = 20;
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my $host = $ENV{host} || undef;
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my $port = $ENV{port} || 161;
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my $community = $ENV{community} || "public";
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my $iface = $ENV{interface} || undef;
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my $response;
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if (defined $ARGV[0] and $ARGV[0] eq "snmpconf")
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{
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# HOST-RESOURCES-MIB::hrStorage
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# HOST-RESOURCES-TYPES::hrStorageVirtualMemory
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print "require 1.3.6.1.2.1.25.2. 1.3.6.1.2.1.25.2.1.3\n";
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exit 0;
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}
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if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_swap$/)
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{
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$host = $1;
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if ($host =~ /^([^:]+):(\d+)$/)
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{
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$host = $1;
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$port = $2;
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}
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}
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elsif (!defined($host))
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{
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print "# Debug: $0 -- $1\n" if $DEBUG;
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die "# Error: couldn't understand what I'm supposed to monitor.";
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}
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my ($session, $error) = Net::SNMP->session(
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-hostname => $host,
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-community => $community,
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-port => $port
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);
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if (!defined ($session))
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{
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die "Croaking: $error";
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}
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my $hrStorage = "1.3.6.1.2.1.25.2.";
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my $hrStorageVirtualMemory = "1.3.6.1.2.1.25.2.1.3";
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my $hrStorageSize = "1.3.6.1.2.1.25.2.3.1.5.";
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my $hrStorageUsed = "1.3.6.1.2.1.25.2.3.1.6.";
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my $swap_d = get_by_regex($session, $hrStorage, $hrStorageVirtualMemory);
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my $swapsize = 0; my $swapused = 0;
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foreach my $swap (keys %$swap_d)
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{
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$swapsize += get_single($session, $hrStorageSize . $swap);
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$swapused += get_single($session, $hrStorageUsed . $swap);
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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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print "host_name $host\n";
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print "graph_title Virtual memory usage\n";
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if ($swapsize > 0)
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{
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print "graph_args -l 0 --base 1000 --upper-limit $swapsize\n";
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}
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else
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{
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print "graph_args -l 0 --base 1000\n";
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}
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print "graph_vlabel Bytes\n";
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print "graph_category disk\n";
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print "graph_info This graph shows swap usage in bytes.\n";
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print "swap.label swap\n";
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print "swap.type DERIVE\n";
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print "swap.min 0\n";
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exit 0;
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}
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print "swap.value $swapused\n";
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sub get_single
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{
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my $handle = shift;
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my $oid = shift;
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print "# Getting single $oid..." if $DEBUG;
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$response = $handle->get_request ($oid);
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if (!defined $response->{$oid})
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{
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print "undef\n" if $DEBUG;
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return undef;
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}
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else
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{
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print "\"$response->{$oid}\"\n" if $DEBUG;
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return $response->{$oid};
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}
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}
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sub get_by_regex
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{
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my $handle = shift;
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my $oid = shift;
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my $regex = shift;
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my $result = {};
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my $num = 0;
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my $ret = $oid . "0";
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my $response;
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print "# Starting browse of $oid...\n" if $DEBUG;
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while (1)
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{
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if ($num == 0)
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{
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print "# Checking for $ret...\n" if $DEBUG;
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$response = $handle->get_request ($ret);
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}
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if ($num or !defined $response)
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{
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print "# Checking for sibling of $ret...\n" if $DEBUG;
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$response = $handle->get_next_request ($ret);
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}
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if (!$response)
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{
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return undef;
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}
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my @keys = keys %$response;
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$ret = $keys[0];
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print "# Analyzing $ret (compared to $oid)...\n" if $DEBUG;
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last unless ($ret =~ /^$oid/);
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$num++;
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next unless ($response->{$ret} =~ /$regex/);
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@keys = split (/\./, $ret);
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$result->{$keys[-1]} = $response->{$ret};;
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print "# Index $num: ", $keys[-1], " (", $response->{$ret}, ")\n" if $DEBUG;
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};
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return $result;
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}
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