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How to add multiple ssh keys for a single user

If you are using multiple email addresses for different services and each of them require you to enter a different public key, then you need to have a public key generated locally for each such email address. The only catch is, the default one can live in the file called id_rsa.pub whereas the others have to live in a different file and your local ssh would need to know where to find this file.

The following steps also help resolve the error - "Fingerprint has already been taken" when you are adding an existing ssh key on your website
Lets say you registered with github.com using [email protected] and with gitlab.com using [email protected]
# First lets generate our SSH key for github.com
ssh-keygen -t rsa -C "[email protected]"
# Assume you saved the above generated key in the default file id_rsa.pub

# Now lets generate our SSH key for gitlab.com
# We will need to save the next key in a different file.

ssh-keygen -t rsa -C "[email protected]"
# Assume you saved this one in /home/username/.ssh/id_rsa.two
The next step is to configure SSH to look for your custom file name. Here's how thats done. Edit your ~/.ssh/config file and add en entry for your custom file name which is used by gitlab.
Host gitlab.com
  HostName gitlab.com
  User git
  IdentityFile ~/.ssh/id_rsa.two
And now you can easily use each SSH key for each such website.