SSH Config file is a way to manage your manage your ssh connections.

If you have multiple ssh keys, one can connect to a different host using

ssh -i ~/.ssh/custom_key  username@host.com

Another way to deal with multiple hosts ans keys is to use an ssh config file (~/.ssh/config)

For example, here is how my file looks

Host github.com
    User git
    IdentityFile ~/.ssh/id_git
    Port 22

Host home
   Hostname homeserver.duckdns.org
   User ubuntu
   Port 2224
   IdentityFile ~/.ssh/id_homeserver

You can ignore the port line above, is the ssh server is listening on port 22.

Now, you can connect to the destination, by using

ssh home

See also

• SSH Tunneling