Expert Python Programming - Third Edition

Setting up complex environments

While the basic usage of Docker is pretty straightforward for basic setups, it can be bit overwhelming once you start to use it in multiple projects. It is really easy to forget about specific command-line options, or which ports should be published on which images. But things start to be really complicated when you have one service that needs to communicate with others. Single docker containers should only contain one running process.

This means that you really shouldn't put any additional process supervision tools, such as Supervisor and Circus, and should instead set up multiple containers that communicate with each other. Each service may use a completely different image, provide different configuration ...