I am doing some tests to upgrade our ns6 server to ns7 via rsync to a new hardware (maybe I will then bring it back to original server with new disks, but this is not the point). I am following the documentation, but this sentence made me panic a bit: “* close access to every network service on the source machine (except for SSH and httpd-admin)”!?
Is this temporary or also blocks restart of those services??
If something goes wrong, can I simply power off the new server and turno on the old one again or not??