The API Gateway can handle up to 2 MySQL databases (v5.5, I believe). But if you're going to use multiple databases, then they should be configured using Master/Master replication.
There are some good examples of how to deploy MySQL using Master/Slave replication. Does anyone have an example of how to deploy MySQL in Kubernetes using Master/Master replication?
I think everyone looking to move to Docker/Kubernetes would find this useful.