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How To Set SSH Login Email Alerts In Linux Server

To improve the security of the server, especially web server which exposes to the Internet and possible worldwide hackers, it’s best to enable server to automatically send a notification email to predefined email address every time someone logs in as root to the host. To configure the automatic email alert notification to a default email address on each incident of root log on on the server, use the following guide.

 

Step 1 – On Debian/Ubuntu/Linux Mint

# apt-get install mailx

 

Step 1 – On RHEL/CentOS/Fedora

# yum install mailx

 

Step 2 – Now login as root user and go to root’s home directory by typing cd /root command.

# cd /root

 

Step 3 – Open .bashrc file with vi or nano editor. Please remember .bashrc is a hidden file, you won’t see it by doing ls -l command. You’ve to use -a flag to see hidden files in Linux.

# vi .bashrc

 

Step 4 – Add the following whole line at the bottom of the file. Make sure to replace “ServerName” with a hostname of your Server and change “your@yourdomain.com” with a your email address.

echo 'ALERT - Root Shell Access (ServerName) on:' `date` `who` | mail -s 
"Alert: Root Access from `who | cut -d'(' -f2 | cut -d')' -f1`" your@yourdomain.com

 

Step 5 – Save and close the file and logout and log back in. Once you login via SSH, a .bashrc file by default executed and sends you an email address of the root login alert.

 

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