That's really cool. Luckily, our datacenters where these machines are all Tier 3, so the full reboot doesn't happen very often. We've only had to shut down a lot of racks once for some power management issues. It was a bit of a struggle, but things eventually booted.

The bigger issue that we faced was that dnsmasq couldn't keep up with all the UDP packets and we had to switch to Kea kind of mid-flight, which was a bit of work since it was a weekend (of course things fail on friday night) and restarting everything to get new leases (and a few with duplicate IPs) was a bit of nail biting. It all sorted itself out though and we haven't had any more issues on that front.