I had the pleasure of working on a three node blue-green system at a Fortune 100 company (yes, enterprise can do some things right). Each cluster could be in ei

I had the pleasure of working on a three node blue-green system at a Fortune 100 company (yes, enterprise can do some things right). Each cluster could be in either of two production modes or a staging mode, all switched with a simple command line request. The request created touchfiles that managed the load balancer behavior. Instantaneous switching, yeah! On the other hand, the database was more or less a cache. It was very much availability over consistency, in CAP terms. If we had to keep transactional data, it would have been harder. edit: When I started there and they described the architecture to me, I said "Cool, you're doing blue green deployment!", and the response was "What's blue green deployment?"