Automatic Login in SSH using config file

Remembering tons of SSH hosts and respective signature files is hard. This is when the config file comes in place. Edit the file ~/.ssh/config.

$ vi ~/.ssh/config

Add the following:

Host server1
     HostName server1.example.com
     User root
     Port 22
     IdentityFile ~/.ssh/test.pem

Next time you try to login to the server:

$ ssh server1