I don’t know about WW experience, but I know several russian companies with big clouds on OpenStack. We have a some experience with that painful solution. (Rabbitmq, for example, is thin place on big clouds (> 500 compute nodes in one cell)) Guys from OpenStack reinvent VRRP itself and when rabbitmq connection both network node and ampq server is broken - we get situation, when two routers with VRRP in MASTER state. Solutions from community - bump your erlang and rabbitmq version to upsteram and try. And many, many interesting things.
I don’t know about WW experience, but I know several russian companies with big clouds on OpenStack. We have a some experience with that painful solution. (Rabbitmq, for example, is thin place on big clouds (> 500 compute nodes in one cell)) Guys from OpenStack reinvent VRRP itself and when rabbitmq connection both network node and ampq server is broken - we get situation, when two routers with VRRP in MASTER state. Solutions from community - bump your erlang and rabbitmq version to upsteram and try. And many, many interesting things.