SSH Without A Password

Here's a quick post explaining how you can SSH into a remote machine without using a password.

Spoiler: Yes, it is of course using a public key.

First generate a pair of authentication keys on your laptop.

ssh-keygen -t rsa

Then copy the public key generated in the previous step, located at .ssh/id_rsa.pub, to /home/ubuntu/.ssh/authorized_keys of your remote machine.

Once done, you can log into the remote machine directly without a password.

ssh <user>@<remote-machine-address>

In case of ubuntu user, you'd use:

ssh ubuntu@<remote-machine-address>