SSH alias will be helpful while dealing with multiple systems as there no need to remember all hostnames/ip addresses.
This article explains the steps to configure SSH alias using config file.
Step1: Open default SSH client configuration file "~/.ssh/config".
Step2: Update the server details to this file in the following format.
Host webserver HostName 192.168.10.1 User root IdentityFIle ~/.ssh/Key-file Port 22 Host dbserver HostName 192.168.10.2 User root IdentityFIle ~/.ssh/Key-file Port 22
Here the values Host, Hostname, User, Key-file and Port need to be replaced according to the required environments.
Now we can able to use the aliases for ssh in the following way.
#ssh webserver #ssh dbserver
Please note that this alias is available only for the current user. If you want to make the aliases available for all users, do the same configurations in /etc/ssh/ssh_config file.