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There was a talk from someone from Yahoo back in 2013 on the Fedora Flock conference in Prague about how they can re-provision baremetal machines in less than one minute.

They used the regular Anaconda installer (used for Feodra, RHEL and related distros) to install the rootfs from a tarball, even doing a live demo - tha machine was doingn something - the reybooted it into the installer, which wiped the storage, unpacked the tarball and configured the system. After reboot the new system was up, ready to do something else - all in less than 60 seconds, including 2 reboots, back in 2013.