Using multiple github accounts with ssh keys

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

1. Generate ssh key pairs for accounts and add them to GitHub accounts.

2. Edit/Create ssh config file (~/.ssh/config):

   # Default github account: oanhnn
   Host github.com
      HostName github.com
      IdentityFile ~/.ssh/oanhnn_private_key
      IdentitiesOnly yes
      
   # Other github account: superman
   Host github-superman
      HostName github.com
      IdentityFile ~/.ssh/superman_private_key
      IdentitiesOnly yes
   

3. Add ssh private keys to your agent:

   $ ssh-add ~/.ssh/oanhnn_private_key
   $ ssh-add ~/.ssh/superman_private_key

4. Test your connection

   $ ssh -T [email protected]
   $ ssh -T git@github-superman

   With each command, you may see this kind of warning, type yes:

   The authenticity of host 'github.com (192.30.252.1)' can't be established.
   RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:
   Are you sure you want to continue connecting (yes/no)?

   If everything is OK, you will see these messages:

   Hi oanhnn! You've successfully authenticated, but GitHub does not provide shell access.

   Hi superman! You've successfully authenticated, but GitHub does not provide shell access.

5. Now all are set, just clone your repositories

   $ git clone git@github-superman:org2/project2.git /path/to/project2
   $ cd /path/to/project2
   $ git config user.email "[email protected]"
   $ git config user.name  "Super Man"

Done! Goodluck!