SSH password-free login allows users to log in to remote servers without entering a password, improving login efficiency and security. The following are the steps for SSH password-free login:
Generate public and private keys
Use the ssh-keygen command on your local computer to generate public and private keys. By default, these files will be stored in the ~/.ssh directory.
$ ssh-keygen
Copy the public key to the remote server
Copy the public key to the remote server using the ssh-copy-id command. If this command is not installed, you can manually add the public key content to the remote server's ~/.ssh/authorized_keys file.
$ ssh-copy-id username@remote_server
Test password-free login
You should now be able to log in directly to the remote server via the ssh command without entering a password:
$ ssh username@remote_server
If everything is normal, you have successfully implemented SSH password-free login.