ssh

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Notes

To enable logging in from a specific remote client with no password (typically so scripts can connect with ssh or rsync):

• Generate a public/private key pair on the client using ssh-keygen
• Copy the public key file (~/.ssh/id_rsa.pub) from the client to ~/.ssh/authorized_keys
  • If the latter file doesn't already exist, then it can just be a direct copy of id_rsa.pub.
  • If the latter file does already exist, then id_rsa.pub can just be appended to authorized_keys.
• It may be necessary to manually log on once to the client from the host (using the same usernames as above) in order to add the client to the host's known_hosts file; I'm not sure about this part. Need to test.
• Manually log on from the client to the host to make sure that the host is added to the client's known_hosts file, otherwise the verification prompt may interrupt any processes trying to log on automatically.
• If you disable logins now (e.g. via Webmin's "No login allowed" option), you will still be able to log in from a client with an authorized key.

Specific commands for doing this may be found here.