3
# check_rrd_data plugin for nagios
6
# check_rrd machine_id perlexp_warn perlexp_crit perlexp_default [ds]
8
# Checks data from a RRD file. machine_id is normally an IP address, that has
9
# to be mapped to a RRD file, by means of the config file (by default
10
# /var/spool/nagios/rrd-files, a file with pairs of (machine_id,rrd_file),
11
# separated by whitespace). It can be a RRD file, too.
13
# The Perl expressions are expressions to be evaluated in the following cases:
15
# - perlexp_crit. The first one, to check if there is a critical situation. If
16
# it returns other than "", it will be a critical message.
17
# - perlexp_warn. The second one to be evaluated. If returns other than "", a
18
# warning will be issued to Nagios.
19
# - perlexp_default. If both of the above return "", it will be evaluated, and
20
# wathever returns this expression will be returned by the script. NOTE that
21
# this is different from the other two cases, to allow the user issue a
22
# warning or critical failure even if the other two don't return it.
24
# Use these hosts.cfg entries as examples
26
# command[check_ping]=$USER1$/check_rrd_data.pl $HOSTADDRESS$ \
27
# 'return "CHECK_CRICKET_PING: Warning\n" if ($value > 10);' 'return \
28
# "CHECK_CRICKET_PING: Critical\n" if ($value > 100);' 'printf \
29
# "PING OK - RTA = %.2fms\n", $value; return 0;' 1
30
# service[machine]=PING;0;24x7;3;5;1;router-admins;240;24x7;1;1;1;;check_ping
32
# initial version: 28 Nov 2000 by Esteban Manchado Vel�zquez
35
# Copyright Notice: GPL
40
# my $runtimedir = substr($0,0,rindex($0,'/'));
41
# require "$runtimedir/utils.pm";
44
require '/usr/libexec/nagios/plugins/utils.pm';
46
# use strict; # RRD:File and utils.pm don't like this
48
my $configfilepath = "/var/spool/nagios/rrd-files"; # Change if needed
49
my %hostfile; # For storing config
50
my $rrdfile; # RRD file to open
52
$ENV{'PATH'} = "/bin:/usr/bin";
55
if (scalar @ARGV != 4 && scalar @ARGV != 5) {
56
print STDERR join "' '", @ARGV, "\n";
57
my $foo = 'check_rrd_data';
58
print STDERR $foo, " <file.rrd> <perl_exp_warn> <perl_exp_crit> <perl_exp_default> [<ds>]\n\n";
59
print STDERR "<perl_exp_*> is an expression that gets evaluated with \$_ at the current\n";
60
print STDERR "value of the data source. If it returns something other than \"\", there\n";
61
print STDERR "will be a warning or a critical failure. Else, the expression\n";
62
print STDERR "<perl_exp_default> will be evaluated\n";
66
# Check configuration file
67
open F, $configfilepath or do {
68
print "Can't open config file $configfilepath\n";
69
return $ERRORS{'UNKNOWN'};
72
next unless /(.+)\s+(.+)/;
78
my $ds = defined $ARGV[4]?$ARGV[4]:0;
79
# print "\$ds = " . $ds . ":";
80
# print "\$ARGV[4] = " . $ARGV[4] . ":";
81
$ds =~ s/\$//g; # Sometimes Nagios gives 1$ as the last parameter
83
# Guess which RRD file have to be opened
84
$rrdfile = $ARGV[0] if (-r $ARGV[0]); # First the parameter
85
$rrdfile = $hostfile{$ARGV[0]} unless $rrdfile; # Second, the config file
89
print "Can't open data file for $ARGV[0]\n"; # Aaaargh!
90
return $ERRORS{'UNKNOWN'}; # Unknown
93
# print "Opening file $rrdfile:";
94
my $rrd = new RRD::File ( -file => $rrdfile );
96
if (! $rrd->loadHeader()) {
97
print "Couldn't read header from $rrdfile\n";
98
exit $ERRORS{'UNKNOWN'}; # Unknown
100
my $value = $rrd->getDSCurrentValue($ds);
103
# Perl expressions to evaluate
104
my ($perl_exp_warn, $perl_exp_crit, $perl_exp_default) =
105
($ARGV[1], $ARGV[2], $ARGV[3]);
106
my $result; # Result of the expressions (will be printed)
107
my @data; # Special data reserved for the expressions, to pass data
109
# First check for critical errors
110
$perl_exp_crit =~ /(.*)/;
112
$result = eval $perl_exp_crit;
119
$perl_exp_warn =~ /(.*)/;
121
$result = eval $perl_exp_warn;
127
$perl_exp_default =~ /(.*)/;
128
$perl_exp_default = $1;
129
eval $perl_exp_default; # Normally returns 0 (OK)