How can I allow SFTP connections with SSH keys only on Ghost one click install app server?

The tutorial Initial Server Setup with Ubuntu 14.04 will walk you through creating a non-root accout with SSH keys and disabling SSH access completely for the root account. Since SFTP uses SSH, once you’ve set that up, SFTP access will also be disabled for the root user.

• Initial Server Setup with Ubuntu 14.04
• How To Use SFTP to Securely Transfer Files with a Remote Server

That should point you in the right direction. Let us know if you run into any problems!

Here is the answer without thousands of words and external links in three simple steps.

Add the line below to /etc/sudoers

username ALL=(ALL) NOPASSWD:ALL

Edit /etc/ssh/sshd_config and change (and uncomment if necessary) the line, default is probably ‘yes’:

PermitRootLogin no

Also edit/change/uncomment:

PasswordAuthentication no