A few weeks ago I had to migrate a RHEL 5 server to Hyper-V. Yes, RHEL 5. Released in 2007. Old enough to drive in some states. Naturally, this server was still important. Because of course it was. Nobody keeps legacy servers around because they are fun. They stay around because they run something important, mysterious, undocumented, or all three. So there I was, staring at a server that had survived multiple generations of hardware, operating systems, hypervisors, managers, and probably a few organizational charts. The plan sounded simple: Move the server to Hyper-V. That sentence should come with a warning label. ...