This is one of those things that are terribly easy nowadays, but since I only do it every once in a while I never remember how it's done: setting up a passwordless ssh. I won't write any explanation, just the command to set it up so I can keep it as reference for the next time I have to do it:
ssh-keygen -t rsa && ssh-copy-id USR@HOST
You might also want to specify that HOST requires USR, instead of $(whoami), so you won't have to type ssh USR@HOST next time you want a passwordless loggin. This can be done in /etc/ssh/ssh_config, like this:
Host $HOST
User $USER
Replace as needed.