Configure SSH

First generate key on host system.

$ ssh-keygen -t rsa -b 4096

Add the generated key, so it is going to be automatically picked.

$ ssh-add

Connect to the Debian server and copy the public key on the server as authorized key.

$ ssh ondrej@192.168.1.199 mkdir .ssh
$ cat ~/.ssh/id_rsa.pub | ssh ondrej@192.168.1.199 'cat >> .ssh/authorized_keys'
$ ssh ondrej@192.168.1.199 'chmod 700 .ssh; chmod 640 .ssh/authorized_keys'

Now we can connect via SSH, without password.

$ ssh ondrej@192.168.1.199

Disable password logins to make the server more secure.

$ sudo vi /etc/ssh/sshd_config

Then we update PasswordAuthentication from yes to no.

PasswordAuthentication no

Then we need to restart SSH to apply changes.

$ sudo systemctl restart ssh