Hi, when I create droplets I use the existing functionality provided on the website to automatically add ssh keys to the new server.

I can see my keys are added under /root/.ssh/authorized_keys. That works fine.

However, I have noticed that the /etc/ssh folder has some of it`s own default keys which I never put there.

I cannot delete them because the sshd config defaults to them.

\#HostKey /etc/ssh/ssh_host_rsa_key
\#HostKey /etc/ssh/ssh_host_ecdsa_key
\#HostKey /etc/ssh/ssh_host_ed25519_key

At the same time I cannot change the config to point to /root/.ssh/authorized_keys file as it complains about invalid format.

I could not find any documentation explaining the scenario.
https://www.digitalocean.com/docs/droplets/how-to/add-ssh-keys/to-existing-droplet/