I don’t know why I’ve never got round to doing this before, but this handy guide will show you how to create an RSA key and stop having to authenticate with a password each time you try to SSH into your server.
https://help.ubuntu.com/community/SSH/OpenSSH/Keys
Suprisingly simple, and great when managing various servers. Now, why didn’t I get round to doing this when I had 150+ servers in the mid 2000s.
Note:
When I ran into some problems along the way (due to not setting the permissions to 600 on the authorized_keys file, I used:
ssh -v user@host
To get a verbose output and find the problem.