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

On the remote server, edit the sshd_config file and change LogLevel from INFO to VERBOSE and restart ssh.

Now your log file will hold the fingerprint of the key that was used to authenticate each user.

On Ubuntu, these files are:

/etc/ssh/sshd_config
/var/log/auth.log

but they may be different on another distro. Just google for their location (some use /var/log/secure for example).