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Specify a different ssh key for each host

The ~/.ssh/config file can be edited to specify a different key/identity for each host. This is useful when you have different ssh keys setup on different git servers.

Host mycompany
    HostName mycompany.com
    User fooey
Host github.com
    IdentityFile ~/.ssh/github.key

If you specify a HostName that is different from Host, the .git/config file should use the name specified in Host. That should also be the host name used in git commands such as clone and remote.

See Simplify Your Life With an SSH Config File for more.