scripts / nagios-plugins

Commit c381946e6a58db3e5f378463ca50ac6319357d8c

Authored by Frederik Lindenaar
0 parents

Initial checkin of standard check_memory script

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Showing 1 changed file with 154 additions and 0 deletions
check_memory 0 → 100755
  View file @c381946
  1 +++ a/check_memory
  1 +#!/usr/bin/perl
  2 +#
  3 +# check_memory - Check free(1) data against given tresholds
  4 +#
  5 +# Copyright (C) 2007 Thomas Guyot-Sionnest <tguyot@gmail.com>
  6 +#
  7 +# This program is free software; you can redistribute it and/or
  8 +# modify it under the terms of the GNU General Public License
  9 +# as published by the Free Software Foundation; either version 2
  10 +# of the License, or (at your option) any later version.
  11 +#
  12 +# This program is distributed in the hope that it will be useful,
  13 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 +# GNU General Public License for more details.
  16 +#
  17 +# You should have received a copy of the GNU General Public License
  18 +# along with this program; if not, write to the Free Software
  19 +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20 +#
  21 +
  22 +
  23 +use strict;
  24 +use warnings;
  25 +use vars qw($PROGNAME $VERSION $FREECMD $UNIT);
  26 +use Nagios::Plugin;
  27 +
  28 +$PROGNAME = "check_memory";
  29 +$VERSION = '1.0.1';
  30 +$FREECMD = '/usr/bin/free';
  31 +$UNIT = 'M';
  32 +
  33 +my $np = Nagios::Plugin->new(
  34 + usage => "Usage: %s [ -w <warning_threshold> ] [ -c <critical_threshold> ]\n"
  35 + . ' [ -u <unit> ]',
  36 + version => $VERSION,
  37 + plugin => $PROGNAME,
  38 + blurb => 'Check free(1) data against given tresholds',
  39 + timeout => 30,
  40 +);
  41 +
  42 +$np->add_arg(
  43 + spec => 'warning|w=s',
  44 + help => "-w, --warning=THRESHOLD[%]\n"
  45 + . " Warning threshold (in bytes or percent) for free memory. See\n"
  46 + . " http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT\n"
  47 + . " for the threshold format. Alternatively this can be defined as a percentage\n"
  48 + . ' of minimum free memory (warning and critical must be in the same format).',
  49 + required => 0,
  50 +);
  51 +
  52 +$np->add_arg(
  53 + spec => 'critical|c=s',
  54 + help => "-c, --critical=THRESHOLD[%]\n"
  55 + . " Critical threshold (in bytes or percent) for free memory. See\n"
  56 + . " http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT\n"
  57 + . " for the threshold format. Alternatively this can be defined as a percentage\n"
  58 + . ' of minimum free memory (warning and critical must be in the same format).',
  59 + required => 0,
  60 +);
  61 +
  62 +$np->add_arg(
  63 + spec => 'unit|u=s',
  64 + help => "-u, --unit=UNIT\n"
  65 + . " Unit to use for human-redeable output. Can be 'b', 'K' 'M' or 'G' for\n"
  66 + . " bytes, KiB, MiB or GiB respectively (default: '$UNIT').",
  67 + default => $UNIT,
  68 + required => 0,
  69 +);
  70 +
  71 +$np->getopts;
  72 +
  73 +# Assign, then check args
  74 +
  75 +my $multiple;
  76 +my $unit = $np->opts->unit;
  77 +if ($unit eq 'M') {
  78 + $multiple = 1024 * 1024;
  79 +} elsif ( $unit eq 'K') {
  80 + $multiple = 1024;
  81 +} elsif ( $unit eq 'b') {
  82 + $multiple = 1;
  83 +} elsif ( $unit eq 'G') {
  84 + $multiple = 1024 * 1024 * 1024;
  85 +} else {
  86 + $np->nagios_exit('UNKNOWN', "Unit must be one of 'b', 'K', 'M' or 'G', case-sensitive.");
  87 +}
  88 +my $verbose = $np->opts->verbose;
  89 +
  90 +# Would better fit later but doing it here validates thresholds
  91 +my $warning = $np->opts->warning;
  92 +my $critical = $np->opts->critical;
  93 +$np->set_thresholds(
  94 + warning => ((defined($warning) && $warning !~ /^\d+%$/) ? $warning : undef),
  95 + critical => ((defined($critical) && $critical !~ /^\d+%$/) ? $critical : undef),
  96 +);
  97 +
  98 +# Better safe than sorry
  99 +alarm $np->opts->timeout;
  100 +
  101 +# We always get bytes, then calculate units ourselves
  102 +warn("Running: '$FREECMD -b'\n") if ($verbose);
  103 +open(RESULT, "$FREECMD -b |")
  104 + or $np->nagios_exit('CRITICAL', "Could not run $FREECMD");
  105 +
  106 +warn("Output from $FREECMD:\n") if ($verbose > 1);
  107 +my ($used, $free);
  108 +while (<RESULT>) {
  109 + warn(" $_") if ($verbose > 1);
  110 + next unless (m#^\-/\+\ buffers/cache:\s*(\d+)\s+(\d+)#);
  111 + $used = $1;
  112 + $free = $2;
  113 +}
  114 +
  115 +close(RESULT);
  116 +alarm(0);
  117 +
  118 +$np->nagios_exit('CRITICAL', "Unable to interpret $FREECMD output") if (!defined($free));
  119 +
  120 +my $total = $used + $free;
  121 +if (defined($warning) && $warning =~ /^\d+%$/) {
  122 + if ($warning) {
  123 + $warning =~ s/%//;
  124 + $warning = $total / 100 * $warning;
  125 + $warning .= ':';
  126 + }
  127 + warn("Calculated threshold (from percentage): warn=>$warning\n") if ($verbose);
  128 +}
  129 +
  130 +if (defined($critical) && $critical =~ /^\d+%$/) {
  131 + if ($critical) {
  132 + $critical =~ s/%//;
  133 + $critical = $total / 100 * $critical;
  134 + $critical .= ':';
  135 + }
  136 + warn("Calculated threshold (from percentage): crit=>$critical\n") if ($verbose);
  137 +}
  138 +
  139 +$np->set_thresholds(
  140 + warning => $warning,
  141 + critical => $critical,
  142 +);
  143 +
  144 +$np->add_perfdata(
  145 + label => "free",
  146 + value => $free,
  147 + uom => 'b',
  148 + threshold => $np->threshold,
  149 +);
  150 +
  151 +my $freeprint = int($free/$multiple);
  152 +
  153 +$np->nagios_exit($np->check_threshold($free), "$freeprint$unit free");
  154 +