SSH Server Config

Copy original config

sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.orig

Change configuration

sudo vi /etc/ssh/sshd_config

• Allow public key authentication

  PubkeyAuthentication yes
  AuthorizedKeysFile .ssh/authorized_keys
  

• Allow root login

  PermitRootLogin yes
  

• Allow selected user

  AllowUsers root <user>
  

Restart SSH service

sudo systemctl reload ssh