Password-less SSH Login

Check if there is already a public authentication key on local computer, this first step is important because if you override existing public authentication key, you will not be able to password-less login to previously set remote computers:

ls -la ~/.ssh/id_*.pub

If you already have public authentication key you can use it for password-less login but if there’s none, generate a new SSH key pair:

ssh-keygen -t rsa -b 4096 -C "your_email"

Go with the default file location and file name, press Enter for no passphrase and check it:

ls ~/.ssh/id_*

Next step is to copy your public authentication key to remote server:

ssh-copy-id remote_user_name@remote_server_ip_address

Enter the remote_user_name password. Now check if its working:

ssh remote_user_name@remote_server_ip_address

If everything went well, this will log you into the remote server. You can add the same key to multiple remote serves.

Based on: linuxize.com