/usr/lib/nagios/plugins/check_memory is in nagios-plugins-contrib 21.20170222.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | #!/usr/bin/perl
#
# check_memory - Check free(1) data against given tresholds
#
# Copyright (C) 2007 Thomas Guyot-Sionnest <tguyot@gmail.com>
#
# 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; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
use strict;
use warnings;
use vars qw($PROGNAME $VERSION $FREECMD $UNIT);
sub load_module {
my @names = @_;
my $module;
for my $name (@names) {
my $file = $name;
# requires need either a bare word or a file name
$file =~ s{::}{/}gsxm;
$file .= '.pm';
eval {
require $file;
$name->import();
$module = $name;
};
last if $module;
}
return $module;
}
my $plugin_module;
BEGIN {
$plugin_module = load_module( 'Monitoring::Plugin', 'Nagios::Plugin' );
}
$PROGNAME = "check_memory";
$VERSION = '1.0.1';
$FREECMD = '/usr/bin/free';
$UNIT = 'M';
my $np = $plugin_module->new(
usage => "Usage: %s [ -w <warning_threshold> ] [ -c <critical_threshold> ]\n"
. ' [ -u <unit> ]',
version => $VERSION,
plugin => $PROGNAME,
blurb => 'Check free(1) data against given tresholds',
timeout => 30,
);
$np->add_arg(
spec => 'warning|w=s',
help => "-w, --warning=THRESHOLD[%]\n"
. " Warning threshold (in bytes or percent) for free memory. See\n"
. " http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT\n"
. " for the threshold format. Alternatively this can be defined as a percentage\n"
. ' of minimum free memory (warning and critical must be in the same format).',
required => 0,
);
$np->add_arg(
spec => 'critical|c=s',
help => "-c, --critical=THRESHOLD[%]\n"
. " Critical threshold (in bytes or percent) for free memory. See\n"
. " http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT\n"
. " for the threshold format. Alternatively this can be defined as a percentage\n"
. ' of minimum free memory (warning and critical must be in the same format).',
required => 0,
);
$np->add_arg(
spec => 'unit|u=s',
help => "-u, --unit=UNIT\n"
. " Unit to use for human-redeable output. Can be 'b', 'K' 'M' or 'G' for\n"
. " bytes, KiB, MiB or GiB respectively (default: '$UNIT').",
default => $UNIT,
required => 0,
);
$np->getopts;
# Assign, then check args
my $multiple;
my $unit = $np->opts->unit;
if ($unit eq 'M') {
$multiple = 1024 * 1024;
} elsif ( $unit eq 'K') {
$multiple = 1024;
} elsif ( $unit eq 'b') {
$multiple = 1;
} elsif ( $unit eq 'G') {
$multiple = 1024 * 1024 * 1024;
} else {
$np->nagios_exit('UNKNOWN', "Unit must be one of 'b', 'K', 'M' or 'G', case-sensitive.");
}
my $verbose = $np->opts->verbose;
# Would better fit later but doing it here validates thresholds
my $warning = $np->opts->warning;
my $critical = $np->opts->critical;
$np->set_thresholds(
warning => ((defined($warning) && $warning !~ /^\d+%$/) ? $warning : undef),
critical => ((defined($critical) && $critical !~ /^\d+%$/) ? $critical : undef),
);
# Better safe than sorry
alarm $np->opts->timeout;
# We always get bytes, then calculate units ourselves
warn("Running: '$FREECMD -b'\n") if ($verbose);
open(RESULT, "$FREECMD -b |")
or $np->nagios_exit('CRITICAL', "Could not run $FREECMD");
warn("Output from $FREECMD:\n") if ($verbose > 1);
my $new_format = 0;
my ($total, $used, $free);
while (<RESULT>) {
warn(" $_") if ($verbose > 1);
# New `free` output from procps doesn't provide "buffers/cache" anymore, but
# provides a better estimate of available memory ("available" column).
$new_format = 1 if m{^\s+total\s+used\s+free\s+shared\s+buff/cache\s+available$};
if ($new_format and /^Mem:\s+(\d+)\s+\d+\s+\d+\s+\d+\s+\d+\s+(\d+)$/) {
$total = $1;
$free = $2; # available column
$used = $total - $free; # used is everything which is not available
} elsif (m#^\-/\+\ buffers/cache:\s*(\d+)\s+(\d+)#) {
$used = $1;
$free = $2;
$total = $used + $free;
}
}
close(RESULT);
alarm(0);
$np->nagios_exit('CRITICAL', "Unable to interpret $FREECMD output") if (!defined($free));
if (defined($warning) && $warning =~ /^\d+%$/) {
if ($warning) {
$warning =~ s/%//;
$warning = $total / 100 * $warning;
$warning .= ':';
}
warn("Calculated threshold (from percentage): warn=>$warning\n") if ($verbose);
}
if (defined($critical) && $critical =~ /^\d+%$/) {
if ($critical) {
$critical =~ s/%//;
$critical = $total / 100 * $critical;
$critical .= ':';
}
warn("Calculated threshold (from percentage): crit=>$critical\n") if ($verbose);
}
$np->set_thresholds(
warning => $warning,
critical => $critical,
);
$np->add_perfdata(
label => "free",
value => $free,
uom => 'b',
threshold => $np->threshold,
);
my $freeprint = int($free/$multiple);
$np->nagios_exit($np->check_threshold($free), "$freeprint$unit free");
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