A major part of our design decision for rebuilding our OpenStack from scratch was availability, closer to what one would see in production. This is one of the things Juju got right, installing most services using HAProxy so that clients could connect to any of the servers running the requested service. What it lacked was load balancers and external HA access. Since we're doing 3 controller nodes, and basically converging all services onto those 3 nodes, we'll do that with the load balancers as well. We need both internal and externally accessible load balanced and redundant servers to take into account both customer APIs and internal/management access from the compute nodes.
