How PlayFab migrated from EC2-Classic to VPC with zero downtime At PlayFab, one of our core tenets is no downtime. This makes challenges like the recent overhaul of our AWS topology particularly interesting. When you’re a backend-as-a-service, you can’t just turn everything off for six hours. (Or six minutes.) This, then, is a postmortem of how we migrated from AWS EC2-Classic to AWS Virtual Priva