Hi!
We just released Onsho, a tool that we've been using internally for a while now.
It helps us in testing our microservice platform, and hopefully it can be useful to you too!
Github: https://github.com/giantswarm/onsho
Read more in this blog post: http://blog.giantswarm.io/mayu-yochu-provisioning-tools-for-coreos-bare-metal/
Feel free to ask questions and discuss topics around our tools here or in #giantswarm in freenode.
Cheers,
Oliver Ponder