You can SSH into your node and use the |hosted-engine| utility. To quote
the documentation:
To see all available commands, run |hosted-engine --help|. For
additional information on a specific command, run |hosted-engine
--/command/ --help|.
There is also a section on "Booting the Engine Virtual Machine in Rescue
Mode", see chapter 3.1.6 here:
https://www.ovirt.org/documentation/administration_guide/index.html