Nagios script: check_nsca

2006-06-01 00:00:00

This script was written at the time I was hired by KPN i-Diensten. It is reproduced/shared here with their permission.

At $CLIENT we've often run into problems with the NSCA daemon, where the daemon would not crash per se, but where it would also not process incoming service checks. The nsca process was still running, but it simply wasn't transferring the incoming results to the Nagios command file.

I was amazed to find that nobody else had written a script to do this! So I quickly wrote one. 

#!/usr/bin/bash
#
# NSCA Nagios service results monitor plugin for Nagios
# Written by Thomas Sluyter (nagiosATkilalaDOTnl)
# By request of KPN-IS, i-Provide, the Netherlands
# Last Modified: 16-08-2006
# 
# Usage: ./check_nsca
#
# Description:
# Aside from checking whether the NSCA process is still running, this script
# also attempts to insert a message into the Nagios queue. After sending a 
# message to the NSCA daemon, it will verify that the message is received by
# Nagios, by checking the nagios.log file. 
#
# Limitations:
#   This script should work properly on all implementations of Linux, Solaris
# and Mac OS X.
#
# Output:
# If the NSCA daemon, or something along the message path, is borked, a 
# CRIT message will be issued. 
#

# You may have to change this, depending on where you installed your
# Nagios plugins
PROGNAME="check_nsca"
PATH="/usr/bin:/usr/sbin:/bin:/sbin"

NAGIOSHOME="/usr/local/nagios"
LIBEXEC="$NAGIOSHOME/libexec"
NAGVAR="$NAGIOSHOME/var"
NAGBIN="$NAGIOSHOME/bin"
NAGETC="$NAGIOSHOME/etc"

. $LIBEXEC/utils.sh


### REQUISITE NAGIOS COMMAND LINE STUFF ###

print_usage() {
	echo "Usage: $PROGNAME"
	echo "Usage: $PROGNAME --help"
}

print_help() {
	echo ""
	print_usage
	echo ""
	echo "NSCA Nagios service results monitor plugin for Nagios"
	echo ""
	echo "This plugin not developped by the Nagios Plugin group."
	echo "Please do not e-mail them for support on this plugin, since"
	echo "they won't know what you're talking about :P"
	echo ""
	echo "For contact info, read the plugin itself..."
}

while test -n "$1" 
do
	case "$1" in
	  --help) print_help; exit $STATE_OK;;
	  -h) print_help; exit $STATE_OK;;
	  *) print_usage; exit $STATE_UNKNOWN;;
	esac
done


### PLATFORM INDEPENDENCE ###

case `uname` in
	Linux) PSLIST="ps -ef";;
	SunOS) PSLIST="ps -ef";;
	Darwin) PSLIST="ps -ajx";;
	*) ;;
    esac


### CHECKING FOR THE NSCA PROCESS ###

[ `$PSLIST | grep nsca | grep -v grep | wc -l` -lt 1 ] && (echo "NSCA process not running."; exit $STATE_CRITICAL)


### INSERTING A TEST MESSAGE ###

DATE=`date +%Y%m%d%H%M`
STRING="`hostname`\tFOOBAR\t0\t$DATE This is a test of the emergency broadcast system.\n"

echo -e "$STRING" | $NAGBIN/send_nsca -H localhost -c $NAGETC/send_nsca.cfg >/dev/null 2>&1


### CHECKING THE NAGIOS LOG FILE ###

sleep 10

if [ `tail -1000 $NAGVAR/nagios.log | grep "emergency broadcast system" | grep $DATE | wc -l` -lt 1 ] 
then
	# Giving it a second try
	sleep 10
	if [ `tail -5000 $NAGVAR/nagios.log | grep "emergency broadcast system" | grep $DATE | wc -l` -lt 1 ]	
	then
		echo "NSCA daemon not processing check results."
		exit $STATE_CRITICAL
	fi
fi


### EXITING NORMALLY ###

echo "OK - NSCA working like it should."
exit $STATE_OK

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