Integrate with Docker.

Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications.

It's become quite popular and I'd like to see the zookeeper community suggest a standard way to run zookeeper inside docker containers. To get the conversation started, I have a working example at:

https://github.com/medined/docker-zookeeper

I hope there is a better technique that I used. And if there is please make suggestions.

The difficulty, I think, posed by Docker, is that the images are started before the bridge network is created. This means, again I think, that zookeeper is running inside the container with no way to communicate with the ensemble for some non-trivial amount of time.

My resolution to this was to force each each to wait 30 seconds before starting zookeeper. I still see connection errors in the logs, but eventually the cluster settles and everything seems to work.

I'm hoping that someone which more networking experience than I can find a way to eliminate that 30 second delay and the connection errors during startup.

Thanks for reading this far.