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
|
#!/usr/bin/perl -w
# $Id$
# 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 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 $command_line);
# 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;
# This the unix command string that brings Perl the data
$command_line = `vmstat | tail -1 | awk '{print \$4,\$5}'`;
chomp $command_line;
@memlist = split(/ /, $command_line);
# Define the calculating scalars
$used_memory = $memlist[0];
$free_memory = $memlist[1];
$total_memory = $used_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)
{
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\n";
exit $exit_codes{'CRITICAL'};
}
elsif ($percent <= $warn_level)
{
print "Memory WARNING - $fmt_pct% ($free_memory kB) free\n";
exit $exit_codes{'WARNING'};
}
else
{
print "Memory OK - $fmt_pct% ($free_memory kB) free\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\n";
exit $exit_codes{'CRITICAL'};
}
elsif ($percent >= $warn_level)
{
print "Memory WARNING - $fmt_pct% ($used_memory kB) used\n";
exit $exit_codes{'WARNING'};
}
else
{
print "Memory OK - $fmt_pct% ($used_memory kB) used\n";
exit $exit_codes{'OK'};
}
}
# 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'};
}
|