I have been developing a tool that is almost the same called 'ozone.io'.. It leverages CMT tools such as puppet, ansible, chef. Not by writing plugins, but rather have users write or extend scripts called 'runners' that install and execute the CMT tool per node. You can checkout a prototype chef-solo runner at https://github.com/ozone-io/runner-chef-solo.

Parallel deployment of multiple clusters is also covered. It too is handled by a directed acyclic graph based on dependencies on other clusters. I am on my own and I am writing it for my thesis which will come out pretty soon.

It is created as an engine that expects cluster state. A sample input file can be seen here which is the only state you need to launch something. https://gist.github.com/wernerb/35a06e08a4d4e6cb02aa

The whole thing works declaratively, so it converges your infrastructure to the desired state. By increasing the nodes for 'smallweb' it will undergo the steps defined in the cluster lifecycle. It will then also update the configuration of the nginx load balancer.

As you can see each cluster is pinned to a provider/instanceprofile, and one of the things I am adding are affinity rules so the cluster deploys to multiple locations/providers.

It is not ready to be opensourced but if any wants to see, contribute or see more I can give view access.

What do you think?