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Add note about user-defined networks.

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Will Sargent 2017-04-26 21:12:51 -07:00 • committed by GitHub
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@ -367,6 +367,8 @@ Note that if you're using [aufs](https://en.wikipedia.org/wiki/Aufs) as your fil
Links are how Docker containers talk to each other [through TCP/IP ports](https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/). [Linking into Redis](https://docs.docker.com/engine/examples/running_redis_service/) and [Atlassian](https://blogs.atlassian.com/2013/11/docker-all-the-things-at-atlassian-automation-and-wiring/) show worked examples. You can also resolve [links by hostname](https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/#/updating-the-etchosts-file).
This has been deprected to some extent by [user-defined networks](https://docs.docker.com/engine/userguide/networking/#user-defined-networks).
NOTE: If you want containers to ONLY communicate with each other through links, start the docker daemon with `-icc=false` to disable inter process communication.
If you have a container with the name CONTAINER (specified by `docker run --name CONTAINER`) and in the Dockerfile, it has an exposed port: