Hi,
As many of you may already know we started design/implementation of master node upgrade feature. Here you can read the design document<https://docs.google.com/a/mirantis.com/document/d/1Mem9LP7ysaHNNSltlCLPw36jHix5ULlKmsMgTViHfog/> . So, it's just status update of this feature. We want to use docker as containers management tool. *Here is Docker's pros and cons* Pros + http://stackoverflow.com/questions/17989306/what-does-docker-add-to-just-plain-lxc + rest API (it will be very useful in case of plugins, when we'll be able to setup new container from inside another container) + lxc requires us to design our own build process and networking + docker has a standard dockerfile format and tools to build images and store them in git and do version management Cons - additional complexity - non-persistent containers, it can be solved with volumes http://www.tech-d.net/2013/12/16/persistent-volumes-with-docker-container-as-volume-pattern/ http://www.offermann.us/2013/12/tiny-docker-pieces-loosely-joined.html http://crosbymichael.com/advanced-docker-volumes.html - regarding non-persistent containers will be a lot of questions like "I patched nailgun but when I rerun container all changes are gone" (can be solved with documentation) Let us know if you have any ideas or questions. Thanks
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