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Lars Strand 2006-11-20 13:38:40 +01:00 • committed by Steve Schnepp
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commit 175c1a2087
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#!/usr/bin/perl -w
#
# Copyright (C) 2006 Lars Strand
#
# Munin plugin to monitor memory usage 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 1.3.6.1.2.1.25.5.1.1.2.\n";
print "require 1.3.6.1.2.1.25.5.1.1.2. [1-9]\n";
print "require 1.3.6.1.2.1.25.2.2.0\n"; # memsize
exit 0;
}
if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_memory$/)
{
$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.";
}
# memory usage pr. process
my $hrSWRunPerfMem = "1.3.6.1.2.1.25.5.1.1.2.";
my ($session, $error) = Net::SNMP->session(
-hostname => $host,
-community => $community,
-port => $port
);
if (!defined ($session))
{
die "Croaking: $error";
}
# total memory
my $memsize = &get_single($session, "1.3.6.1.2.1.25.2.2.0") * 1024;
if (defined $ARGV[0] and $ARGV[0] eq "config")
{
print "host_name $host\n";
print "graph_title Memory usage\n";
print "graph_category system\n";
print "graph_vlabel Bytes\n";
print "graph_info This grap shows memory usage.\n";
# some devices reports negative memtotal value
print "# Total memsize reported $memsize..." if $DEBUG;
if ($memsize > 0)
{
print "grap_args --base 1024 -l 0 --upper-limit $memsize\n";
}
else
{
print "grap_args --base 1024 -l 0\n";
}
print "memory.draw AREA\n";
print "memory.label memory\n";
exit 0;
}
my $processes = get_by_regex($session, $hrSWRunPerfMem, "[1-9]");
# the values
my $memtotal = 0;
while (my ($pid, $mem) = each(%$processes)) {
$memtotal += $mem;
}
printf "memory.value %d\n", ($memtotal * 1024);
sub get_single
{
my $handle = shift;
my $oid = shift;
print "# Getting single $oid..." if $DEBUG;
$response = $handle->get_request ($oid);
if (!defined $response->{$oid})
{
print "undef\n" if $DEBUG;
return undef;
}
else
{
print "\"$response->{$oid}\"\n" if $DEBUG;
return $response->{$oid};
}
}
sub get_by_regex
{
my $handle = shift;
my $oid = shift;
my $regex = shift;
my $result = {};
my $num = 0;
my $ret = $oid . "0";
my $response;
print "# Starting browse of $oid...\n" if $DEBUG;
while (1)
{
if ($num == 0)
{
print "# Checking for $ret...\n" if $DEBUG;
$response = $handle->get_request ($ret);
}
if ($num or !defined $response)
{
print "# Checking for sibling of $ret...\n" if $DEBUG;
$response = $handle->get_next_request ($ret);
}
if (!$response)
{
return undef;
}
my @keys = keys %$response;
$ret = $keys[0];
print "# Analyzing $ret (compared to $oid)...\n" if $DEBUG;
last unless ($ret =~ /^$oid/);
$num++;
next unless ($response->{$ret} =~ /$regex/);
@keys = split (/\./, $ret);
$result->{$keys[-1]} = $response->{$ret};;
print "# Index $num: ", $keys[-1], " (", $response->{$ret}, ")\n" if $DEBUG;
};
return $result;
}