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Compose files, Dockerfiles and the mistakes between them, explained.

Docker Compose Environment Variables: Get Them Right

By Ines Duarte · September 17, 2026

You copied a compose.yaml from a README, dropped a POSTGRES_PASSWORD=supersecret line into a file called .env, and ran docker compose up. Instead of a running database, you got a warning: "The...

How to Use Docker Compose: First Run to Production

By Ines Duarte · September 15, 2026

One YAML file describes every container your app needs, and one command starts them together. What each part of the file does, how the Dockerfile fits in, and the checks that make it start everywhere.