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2.1. Disable Ctrl+Alt+Delete
Anyone that has physical access to the keyboard can simply use the Ctrl+Alt+Delete key combination to reboot the server without having to log on. While someone could simply unplug the power source, you should still prevent the use of this key combination on a production server. This forces an attacker to take more drastic measures to reboot the server, and will prevent accidental reboots at the same time.
To disable the reboot action taken by pressing the Ctrl+Alt+Delete key combination, run the following two commands:
sudo systemctl mask ctrl-alt-del.target sudo systemctl daemon-reload