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As others have written, you can either download your config from an external host, or pass in environment variables to your container and generate a configuration based on them.

Lots of people write their own scripts to do this; I wrote Tiller (http://github.com/markround/tiller) to standardise this usage pattern. While I have written a plugin to support storing values in a Zookeeper cluster, I tend to prefer to keep things in YAML files inside the container - at least, for small environments that don't change often. It just reduces a dependency on an external service, but I can see how useful it would be in larger, dynamic environments.

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