Let's review the commands that we have seen in this lesson.
Firewall CMD is what we used to open the firewall after reconfiguring SSH to listen
on a non standard port. But that's Red Hat and family on Ubuntu. UFW is
doing the equivalent semanaged port is what you need to tell Selinux on the Red
Hat system to allow SSH to bind to this non default port.
Then you have used SSH keygen and ssh copyId and ssh agent
and ssh. Add all of these to set up keybase authentication.