How to use different ssh keys with GitHub/Gitlab

Jul 23, 2024

1. Generate a new SSH key

ssh-keygen -t rsa -b 4096 -C "[email protected]"

2. Start the ssh-agent in the background

eval "$(ssh-agent -s)"

3. Add your private key to the ssh-agent

ssh-add ~/.ssh/id_rsa

4. Create or modify the SSH config file

nano ~/.ssh/config

5. Add the following lines to the config file

Host github.com
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa

Host gitlab.com
    HostName gitlab.com
    User git
    IdentityFile ~/.ssh/id_rsa_gitlab

6. Save and exit the config file

7. Test the connection to GitHub

ssh -T [email protected]

8. Test the connection to GitLab

ssh -T [email protected]