The basis of this is that your ID must be in the list of authorized hosts in the server. So, for password-less login to work, generate your public key, and append it to the authorized_hosts file in the server.
To create a public key, from terminal do
ssh-keygen -t rsa
To copy to authorized_hosts file do
cat ~/.ssh/id_rsa.pub | ssh [email protected] 'cat >> ~/.ssh/authorized_keys'
If no password is asked, everything worked fine.
You can also do the following command to copy the key
ssh-copy-id [email protected]
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