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 53 80 25"


 


# service names as per above ports


service="SSH DNS WEB MAIL"


 


#Email id to send alert


ADMINEMAIL="admin@myispname.com"


 


#Bin paths, set them according to your Linux distro 


NETSTAT=/bin/netstat


MAIL=/usr/bin/mail


LOGGER=/usr/bin/logger


ID=/usr/bin/id


 


# Red hat usr uncomment 


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


}


 


# Make sure only root can run it


is_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 file


init_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 running


chk_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 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