September 2025
Beginner to intermediate
488 pages
12h 55m
English
Content preview from Learn Docker in a Month of Lunches, Second Edition
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18 Application configuration management in containers
Applications need to load their configuration from the environment they’re running in, which is usually a combination of environment variables and files read from disk. Docker creates that environment for apps running in containers, and it can set environment variables and construct a filesystem from many different sources. The pieces are all there to help you build a flexible configuration approach for your apps, so when you deploy to production, you’re using the same image that passed all the test phases but you inject the settings you need for the live environment. You just need to do some work to bring the pieces together, setting up your app to merge configuration values from multiple ...
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