DevOps tutorials for people who want an app to run the same way on every machine, not only on the one it was written on. Learn what each command does before you trust it. A copied command runs just as happily when it is wrong.
Dockerfiles that don't rot, volumes and networks you can explain, and Compose files other people can run. You will shrink a build context, fix permission errors, wire services together with health checks and push an image to a registry. If you skip the checks on ports, secrets and tags, the project runs on your laptop and breaks on the next machine.
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