Nagios script: check_postfix

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 Postfix is up and running. It checks for a number of processes and ports.

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
• Should work with other versions as well.

The script sends a Critical if:

A) One or more processes are not running, or

B) One or more ports are not available for connections.

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
#
# Postfix 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_postfix
#
# Description:
# This plugin determines whether the Postfix SMTP server
# is running properly. It will check the following:
# * Are all required processes running?
# * Are all the required TCP/IP ports open?
#
# Limitations:
# Currently this plugin will only function correctly on Solaris systems.
#
# Output:
# 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 "Postfix 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

check_processes()
{
	PROCESS="0"
	PROCLIST="smtpd qmgr pickup master sendmail"
	for PROC in `echo $PROCLIST`; do
	if [ `ps -ef | grep $PROC | grep -v grep | wc -l` -lt 1 ]; then 
		if [ $PROC == "smtpd" ]; then
			if [ `ps -ef | grep proxymap | grep -v grep | wc -l` -lt 1 ]; then
				PROCESS=1
			else
				PROCESS=0
			fi
		else
			PROCESS=1
		fi
	fi
	done

	if [ $PROCESS -eq 1 ]; then 
		echo "SMTP-S NOK - One or more processes not running"
		exitstatus=$STATE_CRITICAL
		exit $exitstatus
	fi
}

check_ports()
{
	PORTS="0"
	PORTLIST="25"
	for NUM in `echo $PORTLIST`; do
	if [ `netstat -an | grep LISTEN | grep $NUM | grep -v grep | wc -l` -lt 1 ]; then PORTS=1;fi
	done

	if [ $PORTS -eq 1 ]; then 
		echo "SMTP-S NOK - One or more TCP/IP ports not listening."
		exitstatus=$STATE_CRITICAL
		exit $exitstatus
	fi
}

check_processes
check_ports

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

kilala.nl tags: nagios, unix, programming,

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