Specify Different Certificates To Access Different Git Repositories

Besides HTTPS, we can make a connection to a Git repository using SSH. For authentication, we should store our public key on the remote host, and set the remote Git URL on our host to the correct address for SSH connection. For example:

git remote set-url myremote ssh://git@myremotegit.com/myrepo.git

Common SSH client tools provide a specific parameter to set which private key should be used for authentication. For example, the OpenSSH client provides -i parameter to specify the location of the private key that will be used. Meanwhile, common Git client tools may not provide it. When we run a Git command, the tool will look for a private key stored in the default directory which is ~/.ssh/id_rsa. We can resolve this issue by setting up a configuration file that will be stored in ~/.ssh/config. For instance, this is a sample of a configuration file.

Host myremotegit
  HostName myremotegit.com
  User git
  IdentityFile C:\\keys1\\id_rsa
  IdentitiesOnly yes

Host bitbucket-com
  HostName bitbucket.com
  User git
  IdentityFile C:\\keys2\\id_rsa
  IdentitiesOnly yes

We set the Host parameter into a custom name while HostName is the actual address of the host. Then, we can set the remote Git URL using the custom name. This method will make any SSH client including Git client read the ~/.ssh/config file before they can establish an SSH connection. For example:

git remote set-url myremote ssh://git@myremotegit/myrepo.git

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