Multiple SSH Keys settings for different github account

Create different public key

Create different ssh key according the article Generating SSH keys.

Example:

$ ssh-keygen -t rsa -C "[email protected]" -f id_rsa_personal

Or for your work account:

$ ssh-keygen -t rsa -C "[email protected]" -f id_rsa_work

For example, 2 keys created at:

~/.ssh/id_rsa_work
~/.ssh/id_rsa_personal

Then, add these two keys as following:

$ ssh-add ~/.ssh/id_rsa_work
$ ssh-add ~/.ssh/id_rsa_personal

You can delete all cached keys before:

$ ssh-add -D

Finally, check your saved keys:

$ ssh-add -l

Remember to add created keys to your Github account. This guide will help you.

Modify the ssh config

Open ~/.ssh/config file:

$ cd ~/.ssh/
$ touch config
$ vim config # please use your favorite editor

Then add something like:

# work account
Host github.com-work
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_work

# personal account
Host github.com-personal
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_personal

Finally, test your added hosts:

$ ssh -T [email protected]
Hi WorkUser! You've successfully authenticated, but GitHub does not provide shell access.

Or:

$ ssh -T [email protected]
Hi PersonalUser! You've successfully authenticated, but GitHub does not provide shell access.

Clone you repo and modify your Git config

Clone your repo using a configured host (in this case, "github.com-personal"):

    git clone [email protected]:repoowner/repo.git

Enter repository and modify git config:

$ git config user.name "personal"
$ git config user.email "[email protected]" 

Done!