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by detaro 2812 days ago
I don't know their specific setup, but Bare Metal providers generally either netboot your image, or netboot something that copies your image to local disk, and then reboot into it. That can be automated quite far, the biggest issue is having a hardware platform that can't be permanently compromised by the running OS (e.g. on a typical x86 system, the OS could reflash the BIOS or firmware of other components)