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The security of your encrypted SSH tunnels therefore relies on making sure that you have the fingerprints of the hosts you're connecting to. We'll use a simple way to make distributing these fingerprints a little bit easier for all the new users on a system.
* Now ssh to every one of your nested VMs and save their fingerints.
* On your c7host have a look at the /etc/skel directory. It will contain all the files that are inserted into a new user's home directory when it is being created. You can add any other files and directories you like into there.