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Hey guys, this is the first ever post on Serverlogs. The shell scripts are always to handy to do some tasks on a Linux based server for SysAdmins, they can automate everything they do frequently through a shell script. Here I’m going to introduce my first ever script to monitor server load on a Linux based system and alert us via email if it exceeded a triggering value. This will definitely helps us to investigate the server load issues as soon as possible without any paid monitoring addons, I will enhance this more soon to include few other information which will help us to troubleshoot the load issue on a server.

Let’s see the script here:

#!/bin/bash
#
# Date: Jan 18th 2017
# Author: Muhammed Fasal (https://fasal.cf)
# Bash script for monitoring server load and alert us via Email if it exceeds a certain value
#
# Copyright (C) 2017 Muhammed Fasal
#
#variable for triggering
trig=5.00

#Get current load on the server
load=`cat /proc/loadavg | awk '{print $1}'`

#Check both
if [[ $load > $trig ]];
then
echo -e "\n\nYour server load is High. Check Immediatly\n\nServer load : $load " | mail -s "High Server Load [$load]" user@example.com
fi 

You can adjust triggering value there on ‘trig‘ variable, default would be 5 also replace ‘user@example.com‘ with your email address where you wish to receive the alert. Save this on to a file check_load.sh, or you can download this directly from here. Once you have saved/downloaded the file there, create below cron job on the server to monitor the server.

*/2   *   *   *   *  /bin/bash   /path/to/the/folder/check_load.sh

The above crob job will monitor the server on every 2 minutes, and alert us if there any issue with the server load.

If you run into any issues, please contact me at [fasal(at)serverlogs(dot)tk] and let me know thoughts or ideas for improvement. Thanks!