This is part of what the things mentioned in the announcement should help with. There's a clear need for clustering and linking, and so lots of people have built different tools to solve it. That's grand, but it's incredibly confusing coming into it. Particularly since tools vary from production ready to beta to "not actually implemented yet".

The aim here is to still allow people to come up with all kinds of different approaches but to have a set of components that work and are supported by docker. So that you can just get it and it works, and then start swapping bits in and out for the new hotness or some ultra-performant component/etc.