Notifying Nagios that a Node is down/disabled

I wrote a simple perl script for Nagios/Icinga a while ago where you can specify the hostname of the appliance and the pool name you want to monitor. It simply gives you the status of the pool and the number of active nodes.

Usage: check_ltm_pool.pl LTMHOSTNAME POOLNAME

Example output: "OK - Pool: EXAMPLE-POOL / Status: available / Members active: 2 out of 2"

or

"WARNING: Pool EXAMPLE-POOL / Status: available /Members active 1 out of 3"

The script is very quick and dirty written. But maybe you can use it as a start for your own check:

!/usr/bin/perl

       Nagios-Check to monitor Big IP 11 Pool and Member availability.

       Timo Schlueter (26.04.2012)
       Mail: timo@timo.in


use Switch;

my $snmpwalkPath = "/usr/bin/snmpwalk";
my $snmpCommunity = "public";

my $hostname = $ARGV[0];
my $pool_name = $ARGV[1];

my $outputString = "Pool: " . $pool_name . " / ";

my $activeMemberCountOid = "1.3.6.1.4.1.3375.2.2.5.1.2.1.8";
my $availableMemberCountOid = "1.3.6.1.4.1.3375.2.2.5.1.2.1.23";
my $poolAvailabilityCountOid = "1.3.6.1.4.1.3375.2.2.5.5.2.1.2";

my $critCount = 0;
my $warnCount = 0;
my $unknwonCount = 0;

if ($ARGV[0] eq "" || $ARGV[1] eq "") {
        print "UNKNOWN - Missing parameters.";
        exit 1;
}

$pool_availability = snmpwalkCmd($poolAvailabilityCountOid);
$members_available = snmpwalkCmd($availableMemberCountOid);
$members_active = snmpwalkCmd($activeMemberCountOid);

if ($pool_availability eq "" || $members_available eq "" || $members_active eq "") {
        print "UNKNOWN - Invalid pool or snmp problem.";
        exit 1;
}

sub snmpwalkCmd {
        $pool_oid = $pool_name;
        $pool_oid =~ s/(.)/sprintf('.%u', ord($1))/eg;
        $output = `$snmpwalkPath -v2c -c $snmpCommunity -m '' -On -Oe $hostname $_[0] | grep $pool_oid`;
        @array = split(' ', $output);
        @array[$array];
}

switch($pool_availability) {
        case 0  {
                        $outputString .= "Status: not availabie";
                        $critCount++;
                        break;
                }
        case 1  {
                        $outputString .= "Status: available";
                        break;
                }
        else    {
                        $outputString .= "Status: unknown";
                        $unknownCount++;
                        break;
                }
}

$outputString .= " / ";

if ($members_active == 0) {
        $outputString .= "Members active: 0 out of $members_available";
        $critCount++;
} else {
        if ($members_active < $members_available) {
                $outputString .= "Members active: $members_active out of $members_available";
                $warnCount++;
        } else {
                $outputString .= "Members active: $members_active out of $members_available";
        }
}

if ($critCount > 0) {
        print "CRITICAL - " . $outputString;
        exit 2;
}

if ($warnCount > 0) {
        print "WARNING - " . $outputString;
        exit 1;
}

if ($unknownCount > 0) {
        print "UNKNOWN - " . $outputString;
        exit 3;
}

print "OK - " . $outputString;
exit 0;

Regards, Timo