No instructions on setting up jumpbox?

[MattDevOps]

Is it implied that we need to look it up? It says to ssh root@jumpbox but I of course get 'no address associated with hostname'

[dcoy]

That's correct -- it's implied that you'll know the hostname or IP of your server that you'll be executing commands from. If you want a 1:1 match, you can map the jumpbox hostname to the server you'll be using:

Host jumpbox
  HostName <your-hostname-here>
  StrictHostKeyChecking yes
  PreferredAuthentications publickey
  IdentityFile ~/path/to/ssh-key

After doing so, executing ssh root@jumpbox will allow you to connect.

If you haven't setup a server for this, then it will be your local workstation. This is where the following applies:

While a dedicated machine is being used to ensure consistency, these commands can also be run from just about any machine including your personal workstation running macOS or Linux

I hope this helps!