Our current setup consists of 5 mongo nodes. However, each node only hosts a single DB. In on prem setup this is an overkill and we should be able to have just one mongo node hosting multiple DBs. This does not conflict with people having a mongo cluster (i.e. with more than one node).
- on prem setup starts only 1 mongo node
- all DBs are inside this single mongo node
- migration path fro multiple nodes to single
Starting point: https://github.com/mendersoftware/integration/pull/169