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Is it possible to have multiple SSH key in a single client, and let ssh choose the right one automatically?

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2 Answers 2

up vote 11 down vote accepted

You can have different private keys in different files and specify all of them in ~/.ssh/config using separate IdentityFile values (or using -i option while running ssh). They would be tried in sequence (checkout man 5 ssh_config).

If you are using ssh-agent though, you might have to tell the agent about the multiple keys you have using ssh-add.

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Note that if one account has multiple valid keys (e.g. because you use authorized_keys to run specific commands instead of a shell), you may have to use the IdentitiesOnly yes option to make sure ssh-agent doesn't use the wrong one. See also unix.stackexchange.com/q/52092/863 –  Tobias Kienzler Oct 18 '12 at 6:13

Yes:

-i identity_file

Selects a file from which the identity (private key) for public key authentication is read. The default is ~/.ssh/identity for protocol version 1, and ~/.ssh/id_dsa, ~/.ssh/id_ecdsa and ~/.ssh/id_rsa for protocol version 2. Identity files may also be specified on a per-host basis in the configuration file. It is possible to have multiple -i options (and multiple identities specified in configuration files). ssh will also try to load certificate information from the filename obtained by appending -cert.pub to identity filenames.

Just add -i for each identity, or use several IdentityFile lines in you .ssh/config.

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