Git and SSH, which key is used?

Question

Say your .ssh directory contains 30 keys (15 private and 15 public).

Where in Git can one check which one is used to connect to a given remote repository?

Answer 1

Since git just uses ssh to connect, it will use whichever key ssh would use to connect to the remote host. See the ~/.ssh/config file for details; the host block uses the IdentityFile directive to specify the private key to use. The ssh_config(5) manpage contains full details.