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I attended Docker Global Hack Day #2 on Oct 30 from Austin. A talk was given on an active Docker project for host clustering and container management, which was non-pluggable, and made no reference to and used none of the code from CoreOS's etcd/fleet/flannel projects.

This was where I first started worrying about CoreOS and Docker divergence.

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But since the hack day there has been a pretty reasonable (IMO) GitHub discussion about the tradeoffs between out-of-box ease of use and customizability.

https://github.com/docker/docker/pull/8859

I saw that same presentation at the same event, but came away with a very different impression: the container management they showed was implemented completely outside of docker itself, with no patches to the docker codebase needed. Also, IIRC it actually did use significant code from etcd for coordination.

Are we talking about the same thing?: https://github.com/docker/docker/pull/8859 ???

It had no etcd in it and the POC was implemented as part of the Docker API/CLI, as best I recall. There were significant questions in the discussion about etcd not being there.

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