Public Key Authentication

Generate ssh-key

ssh-keygen -f ~/.ssh/rsa

Copy new public key to remote hosts ~.ssh/authorized_keys file

ssh-copy-id -i ~/.ssh/rsa.pub user@host

Update configuration

sudo sed -i 's/^#PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config
sudo sed -i 's/^#AuthorizedKeysFile\s.ssh\/authorized_keys/AuthorizedKeysFile .ssh\/authorized_keys/' /etc/ssh/sshd_config

Or

sudo vi /etc/ssh/sshd_config

PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

Reload service

sudo systemctl reload ssh # sshd

Connect with ssh

ssh <user>@<host>