Shell Script To Monitor Services Such As Web / Http, Ssh, Mail Server

#!/bin/bash
# Shell script to monitor running services such as web/http, ssh, mail etc.
# If service fails it will send an Email to ADMIN user
# -------------------------------------------------------------------------
# Copyright (c) 2006 nixCraft project <http://www.cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# ----------------------------------------------------------------------
# See URL for more info
# http://www.cyberciti.biz/tips/processing-the-delimited-files-using-cut-and-awk.html
# ---------------------------------------------------
# Last updated: Jun - 15 - 2009.
ports="22 80 25"
 
# service names as per above ports
service="SSH WEB MAIL"
 
#Email id to send alert
ADMINEMAIL="admin@myispname.com"
 
#Bin paths, set them according to your Linux distro
NETSTAT=/bin/netstat
MAIL=/bin/mail
LOGGER=/bin/logger
 
#Counters, set defaults
c=1
status=""
sendmail=0
 
# set the following to 1, if you want message in /var/log/messages via a SYSLOG
logtosyslog=0
 
# Log file used to send an email
LOG="/tmp/services.log.$$"
 
# log message to screen and a log file
log(){
	echo "$@"
	echo "$@" >> $LOG
}
 
# log message and stop script
die(){
	echo "$@"
	exit 999
}
 
# Look out for all bins and create a log file
init_script(){
	[ ! -x $MAIL ] && die "$MAIL command not found."
	[ ! -x $NETSTAT ] && die "$MAIL command not found."
	[ ! -x $LOGGER ] && die "$LOGGER command not found."
	>$LOG
}
 
# check for all running services and shoot an email if service is not running
chk_services(){
	log "-------------------------------------------------------------"
	log "Running services status @ $(hostname) [ $(date) ]"
	log "-------------------------------------------------------------"
 
	# get open ports
	RPORTS=$($NETSTAT -tulpn -A inet | grep -vE '^Active|Proto' | awk '{ print $4}' | cut -d: -f2 | sed '/^$/d' | sort  -u)
 
	# okay let us compare them
	for t in $ports
	do
		sname=$(echo $service | cut -d' ' -f$c)
		echo -en " $sname\t\t\t : "
		echo -en " $sname\t\t\t : " >> $LOG
		for r in $RPORTS
		do
			if [ "$r" == "$t" ]
			then
				status="YES"
				sendmail=1
				break
			fi
		done
		echo -n "$status"
		echo ""
		echo -n "$status" >>$LOG
		echo "" >>$LOG
		# Log to a syslog /var/log/messages?
		# This is useful if you have a dedicated syslog server
		[ $logtosyslog -eq 1  ] && $LOGGER "$sname service running : $status"
 
		# Update counters for next round
		c=$( expr $c + 1 )
		status="NO"
	done
	log "-------------------------------------------------------------"
	log "This is an automatically generated $(uname) service status notification by $0 script."
 
	if [ $sendmail -eq 1 ];
	then
		$MAIL -s "Service Down @ $(hostname)" $ADMINEMAIL < $LOG
	fi
}
 
### main ###
init_script
chk_services
 
### remove a log file ###
[ -f $LOG ] && /bin/rm -f $LOG

Tagged as: adminemail, delimited, delimiter, echo line, echo service, expr, for loop, grep, loop method, mail service, mail services, monitor mail server, monitore web server, script collection, sendmail, service names, service status, shell loops, sudo, web mail, while loop