1. Proposed title of this feature request  
       configure mariadb-galera cluster and rabbitmq cluster on separate set of node from the controller via Director
      

    3. What is the nature and description of the request? 
The use case is that in a large scale deployment, running mariadb-galera cluster + rabbitmq-cluster + all API, glance, cinder, other management services etc. on 3 controllers will be causing performance challenges on these controller nodes.
Also, due to large scale - if controller nodes need to be scaled up to handle higher number of API requests + glance and so on, we cannot scale up only controller services without additional database / rabbitmq [as these services are currently tied up with the controller node role / profile]

To avoid such a situation and to be able to scale controller services independently of database / rabbitmq, I want to know the method to do so via director.