Linux / Unix Script: Simple Process Checker To Find Out If A Service Is Running or Not

Linux / Unix Script: Simple Process Checker To Find Out If A Service Is Running or Not

 

simple shell script to find out whether critical services are running or, not under Linux or Unix operating systems. The script can send notification using email.

 

#!/bin/bash
# Name : service.chk 
# URL: http://bash.cyberciti.biz/monitoring/simple-process-checker-script/
# Purpose: A simple process checker. Find out if service is running or not.
# Tested on: Debian and RHEL based system only.
# ----------------------------------------------------------------------------
# Author: nixCraft
# Copyright: 2009 nixCraft under GNU GPL v2.0+
# ----------------------------------------------------------------------------
# Last updated: 13/Mar/2013 - Added support for email and other enhancements 
# Last updated: 05/Dec/2011 - Added support for binary path check
# ----------------------------------------------------------------------------

## Change as per your distro 
_pgrep="/usr/bin/pgrep"
_mail="/usr/bin/mail"

## Add binary list here
_chklist="/usr/bin/php-cgi /usr/sbin/nginx /usr/sbin/lighttpd /usr/sbin/mysqld /usr/sbin/apache2 /usr/sbin/named /usr/sbin/pgsqld"

## yes | no
_sendemail="no"

## Add your email id
_email="your@mobile.email.id.example.com"

## Do not change below
_failed="false"
_service="Service:"

_running() {
local p="${1##*/}"
local s="true"
$_pgrep "${p}" >/dev/null || { s="false"; _failed="true"; _service="${_service} $1,"; }
[[ "$s" == "true" ]] && echo "$1 running" || { echo -n "$1 not running"; [[ ! -f "$1" ]] && echo " [ $1 not found ]" || echo ; }
}

## header
echo "Service status on ${HOSTNAME} @ $(date)"
echo "------------------------------------------------------"

## Check if your service is running or not 
for s in $_chklist
do
_running "$s"
done

## Send a quick email update (good for cron jobs) ##
[[ "$_failed" == "true" && "$_sendemail" == "yes" ]] && { _mess="$_service failed on $HOSTNAME @ $(date)"; 
                                      $_mail -s 'Service not found' "$_email" < "${_mess}";
                                                   }

Sample outputs:

Fig.01: Script in action (click to enlarge)