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Create check_pf_mem

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Although it is written in Perl, this is a far cleaner version than my check_pf_mem hackjob. The original version of this plugin may be Nagios Exchange. I modified the location of the perl intepreter and I also modified the script to use the "used" parameter by default if neither option was provided.
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#!/usr/local/bin/perl
# $Id: check_mem.pl,v 1.1.1.1 2007/11/13 05:25:13 hmann Exp $
# check_mem.pl Copyright (C) 2000 Dan Larsson <dl@tyfon.net>
#
# 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; either version 2
# of the License, or (at your option) any later version.
#
# 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 (or with Nagios); if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA
# Tell Perl what we need to use
use strict;
use warnings;
use Getopt::Std;
use vars qw($opt_c $opt_f $opt_u $opt_w
$free_memory $used_memory $total_memory
$crit_level $warn_level
%exit_codes @memlist
$percent $fmt_pct
$verb_err $sysctl $sysctl_output);
# Predefined exit codes for Nagios
%exit_codes = ('UNKNOWN' ,-1,
'OK' , 0,
'WARNING' , 1,
'CRITICAL', 2,);
# Turn this to 1 to see reason for parameter errors (if any)
$verb_err = 0;
# query the system through the generic sysctl(8) interface
# (this does not require special priviledges)
$sysctl = {};
$sysctl_output = `/sbin/sysctl -a`;
foreach my $line (split(/\n/, $sysctl_output)) {
if ($line =~ m/^([^:]+):\s+(.+)\s*$/s) {
$sysctl->{$1} = $2;
}
}
my $mem_active = $sysctl->{"vm.stats.vm.v_active_count"} * $sysctl->{"hw.pagesize"};
my $mem_inactive = $sysctl->{"vm.stats.vm.v_inactive_count"} * $sysctl->{"hw.pagesize"};
my $mem_cache = $sysctl->{"vm.stats.vm.v_cache_count"} * $sysctl->{"hw.pagesize"};
my $mem_free = $sysctl->{"vm.stats.vm.v_free_count"} * $sysctl->{"hw.pagesize"};
# Define the calculating scalars
$free_memory = $mem_inactive + $mem_cache + $mem_free;
$total_memory = &mem_rounded($sysctl->{"hw.physmem"});
$used_memory = $total_memory - $free_memory;
# Get the options
if ($#ARGV le 0)
{
&usage;
}
else
{
getopts('c:fuw:');
}
# Shortcircuit the switches
if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0)
{
print "*** You must define WARN and CRITICAL levels!" if ($verb_err);
&usage;
}
elsif (!$opt_f and !$opt_u)
{
$opt_u = 1;
# print "*** You must select to monitor either USED or FREE memory!" if ($verb_err);
# &usage;
}
# Check if levels are sane
if ($opt_w <= $opt_c and $opt_f)
{
print "*** WARN level must not be less than CRITICAL when checking FREE memory!" if ($verb_err);
&usage;
}
elsif ($opt_w >= $opt_c and $opt_u)
{
print "*** WARN level must not be greater than CRITICAL when checking USED memory!" if ($verb_err);
&usage;
}
$warn_level = $opt_w;
$crit_level = $opt_c;
if ($opt_f)
{
$percent = $free_memory / $total_memory * 100;
$fmt_pct = sprintf "%.1f", $percent;
if ($percent <= $crit_level)
{
print "Memory CRITICAL - $fmt_pct% ($free_memory kB) free |pct=$fmt_pct\n";
exit $exit_codes{'CRITICAL'};
}
elsif ($percent <= $warn_level)
{
print "Memory WARNING - $fmt_pct% ($free_memory kB) free |pct=$fmt_pct\n";
exit $exit_codes{'WARNING'};
}
else
{
print "Memory OK - $fmt_pct% ($free_memory kB) free |pct=$fmt_pct\n";
exit $exit_codes{'OK'};
}
}
elsif ($opt_u)
{
$percent = $used_memory / $total_memory * 100;
$fmt_pct = sprintf "%.1f", $percent;
if ($percent >= $crit_level)
{
print "Memory CRITICAL - $fmt_pct% ($used_memory kB) used |pct=$fmt_pct\n";
exit $exit_codes{'CRITICAL'};
}
elsif ($percent >= $warn_level)
{
print "Memory WARNING - $fmt_pct% ($used_memory kB) used |pct=$fmt_pct\n";
exit $exit_codes{'WARNING'};
}
else
{
print "Memory OK - $fmt_pct% ($used_memory kB) used |pct=$fmt_pct\n";
exit $exit_codes{'OK'};
}
}
# round the physical memory size to the next power of two which is
# reasonable for memory cards. We do this by first determining the
# guessed memory card size under the assumption that usual computer
# hardware has an average of a maximally eight memory cards installed
# and those are usually of equal size.
sub mem_rounded {
my ($mem_size) = @_;
my $chip_size = 1;
my $chip_guess = ($mem_size / 8) - 1;
while ($chip_guess != 0) {
$chip_guess >>= 1;
$chip_size <<= 1;
}
my $mem_round = (int($mem_size / $chip_size) + 1) * $chip_size;
return $mem_round;
}
# Show usage
sub usage()
{
print "\ncheck_mem.pl v1.0 - Nagios Plugin\n\n";
print "usage:\n";
print " check_mem.pl -<f|u> -w <warnlevel> -c <critlevel>\n\n";
print "options:\n";
print " -f Check FREE memory\n";
print " -u Check USED memory\n";
print " -w PERCENT Percent free/used when to warn\n";
print " -c PERCENT Percent free/used when critical\n";
print "\nCopyright (C) 2000 Dan Larsson <dl\@tyfon.net>\n";
print "check_mem.pl comes with absolutely NO WARRANTY either implied or explicit\n";
print "This program is licensed under the terms of the\n";
print "GNU General Public License (check source code for details)\n";
exit $exit_codes{'UNKNOWN'};
}