How to Get Login Alerts via Email when Root user logs in through SSH in centos

A very good practice is to know when any body logs in to your server using root user, To configure your server to send a email alert when someone logs in as root in your server follow the steps below.

• SSH server as root user

• yum install mailx

• cd /root

• vi .bashrc

Copy the line below and paste it at the end.

• echo 'ALERT - Root Shell Access on (server.hostname.com) on:' `date` from `who` | mail -s "Alert: Root Access from `who | cut -d'(' -f2 | cut -d')' -f1`" contact@dexterserver.com

• Save and exit

Now whenever any body will login as root user in the server you will get the email alert with the IP from which login was made.