#!/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 # 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 53 80 25" # service names as per above portsservice="SSH DNS WEB MAIL" #Email id to send alertADMINEMAIL="admin@myispname.com" #Bin paths, set them according to your Linux distro NETSTAT=/bin/netstatMAIL=/usr/bin/mailLOGGER=/usr/bin/loggerID=/usr/bin/id # Red hat usr uncomment MAIL=/bin/mailLOGGER=/bin/logger #Counters, set defaultsc=1status=""sendmail=0 # set the following to 1, if you want message in /var/log/messages via a SYSLOGlogtosyslog=0 # Log file used to send an emailLOG="/tmp/services.log.$$" # log message to screen and a log filelog(){echo "$@"echo "$@" >> $LOG} # log message and stop scriptdie(){echo "$@"exit 999} # Make sure only root can run itis_root(){local id=$($ID -u)[ $id -ne 0 ] && die "You must be root to run $0."}# Look out for all bins and create a log fileinit_script(){[ ! -x $MAIL ] && die "$MAIL command not found."[ ! -x $NETSTAT ] && die "$NETSTAT command not found."[ ! -x $LOGGER ] && die "$LOGGER command not found."[ ! -x $ID ] && die "$ID command not found."is_root>$LOG} # check for all running services and shoot an email if service is not runningchk_services(){log "-------------------------------------------------------------"log "Running services status @ $(hostname) [ $(date) ]"log "-------------------------------------------------------------" # get open ports RPORTS=$($NETSTAT -tulpn -A inet | grep -vE '^Active|Proto' | grep 'LISTEN' | awk '{ print $4}' | cut -d: -f2 | sed '/^$/d' | sort -u) # okay let us compare themfor t in $portsdosname=$(echo $service | cut -d' ' -f$c)echo -en " $sname\t\t\t : "echo -en " $sname\t\t\t : " >> $LOGfor r in $RPORTSdoif [ "$r" == "$t" ]thenstatus="YES"sendmail=1breakfidoneecho -n "$status"echo ""echo -n "$status" >>$LOGecho "" >>$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 : $status" # Update counters for next roundc=$( expr $c + 1 )status="NO"donelog "-------------------------------------------------------------"log "This is an automatically generated $(uname) service status notification by $0 script." if [ $sendmail -eq 1 ];then$MAIL -s "Service Down @ $(hostname)" $ADMINEMAIL < $LOGfi} ### main ###init_scriptchk_services ### remove a log file ###[ -f $LOG ] && /bin/rm -f $LOG