Send alert email if CPU usage is continuously higher than a certain amount
This can be done through following shell script and a frequent cron job.
cpu_monitor.sh
CPU=$(sar 1 5 | grep "Average" | sed 's/^.* //')if [ $CPU -lt 20 ]then cat mail_content.html | /usr/lib/sendmail -telse echo "Normal"fimail_content.html
From: donotreply@sample.comTo: info@sample.comSubject: Subject of the mailMime-Version: 1.0Content-Type: text/html<h1>CPU usage increased heigh</h1>Here the script will take the CPU ideal percentage for each 1 seconds. And 5 samples will be taken. Then average of that ideal percentage will be passed to variable CPU. When the ideal goes below the 20% mail will be send out.
We can setup the cron with 5 minute duration.
*/5 * * * * cd /full/path/to/script/; ./cpu_monitor.sh;