Nagios script: check_ntp_s

2005-07-01 00:00:00

This script was written at the time I was hired by UPC / Liberty Global.

Basic monitor that checks if the server is up and running. It checks for a process and whether the server has drifted from its higher level Stratum server.

This script was quickly hacked together for my current customer, as a Q&D solution for their monitoring needs. It's no beauty, but it works. Written in ksh and tested with:

• Solaris 8
• NRPE 1.9
• xntpd
• Should work with other versions as well.

The script sends a Critical if:

A) One or more processes are not running, or

B) The server's clock has drifted too far from its higher level Stratum server.

Requires the "check_ntp" plugin which is part of the default monitor package.

UPDATE 19/06/2006:

Cleaned up the script a bit and added some checks that are considered the Right Thing to do. Should have done this -way- earlier!

#!/usr/bin/bash
#
# NTP server process monitor plugin for Nagios
# Written by Thomas Sluyter (nagiosATkilalaDOTnl)
# By request of DTV Labs, Liberty Global, the Netherlands
# Last Modified: 19-06-2006
# 
# Usage: ./check_ntp_s
#
# Description:
# This plugin determines whether the Nagios client is functioning 
# properly as an NTP server. It does this by checking:
# * Are all required processes running?
# * Is the server's time up to scratch with its higher stratum server?
#
# Limitations:
# Currently this plugin will only function correctly on Solaris systems.
#
# Output:
# The script returns a CRIT when one of the abovementioned criteria
# is not matched.
#

# Host OS check and warning message
if [ `uname` != "SunOS" ]
then
        echo "WARNING:"
        echo "This script was originally written for use on Solaris."
        echo "You may run into some problems running it on this host."
        echo ""
        echo "Please verify that the script works before using it in a"
        echo "live environment. You can easily disable this message after"
        echo "testing the script."
        echo ""
fi

# You may have to change this, depending on where you installed your
# Nagios plugins
PATH="/usr/bin:/usr/sbin:/bin:/sbin"
LIBEXEC="/usr/local/nagios/libexec"
. $LIBEXEC/utils.sh

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

print_help() {
	echo ""
	print_usage
	echo ""
	echo "NTP server 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

check_processes()
{
	PROCESS="0"
	if [ `ps -ef | grep xntpd | grep -v grep | grep -v nagios | wc -l` -lt 1 ]; then PROCESS=1;fi
	if [ $PROCESS -eq 1 ]; then 
		echo "NTP-S NOK - One or more processes not running"
		exitstatus=$STATE_CRITICAL
		exit $exitstatus
	fi
}

check_time()
{
	TIME="0"
	#SERVERS="ntp0.nl.net ntp1.nl.net ntp2.nl.net"
	SERVERS="nl-ams99z-a02-01"
	for SERV in `echo $SERVERS`; do
		if [ `/usr/local/nagios/libexec/check_ntp -H $SERV | awk '{print $2}'` != "OK:" ]; then
			TIME=1
		else
			TIME=0
			break
		fi
	done
	if [ $TIME -eq 1 ]; then
		echo "NTP-S NOK - Time not in synch with higher Stratum."
		exitstatus=$STATE_CRITICAL
		exit $exitstatus
	fi
}

check_processes
check_time

echo "NTP-S OK - Everything running like it should"
exitstatus=$STATE_OK
exit $exitstatus

kilala.nl tags: nagios, unix, programming,

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