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The one thing I've spent most time getting right with Docker is networking. It's so different from FreeBSD Jails.

I believe a guide with how to setup a dns container with a dns slave container and get other Docker containers to use the dns containers could be a good introduction to how Docker networking actually work.

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Networking with Docker is a pretty hefty topic. One of the interesting things talked about in the book in this area is skydock[1], which provides automatic dns registration inside docker when you start your containers. We've found it very handy for simulating a network of real machines!

[1] https://github.com/crosbymichael/skydock

You may also like to look at Weave[1], which includes an open-source network for Docker and DNS service to find other containers.

[1]: http://weave.works/

Note: I work on Weave.

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