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SSH-Agent

Once you have setup your SSH-Keys, you can still make logging in almost "password-free" even if you have set a passphrase to be used. This is thanks to your SSH-Agent. To continue the lock and key analogy, setting up a passphrase means that, on top of needing the key to unlock the door, you need to say the right thing to the bouncer. Using the agent is essentially having a minion to whom you tell the passphrase once and who will deal with the bouncer from now on.

To tell your agent to use a given key:

ssh-add mykey_id_rsa

To list the keys (or identities) currently in use:

ssh-add -L

To remove a key from the list:

ssh-add -d mykey_id_rsa

To remove all keys:

ssh-add -D