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  Docker Compose: docker-compose.yml and Multi-Container Applications 📅 Published: Feb 2026 ⏱️ Estimated Reading Time: 18 minutes 🏷️ Tags: Docker Compose, Multi-Container, docker-compose.yml, Container Orchestration, DevOps Introduction: The Multi-Container Challenge A modern application is rarely a single container. A typical web application might include: A web server container (Nginx) An application container (Node.js, Python, Ruby) A database container (PostgreSQL, MySQL) A cache container (Redis) A background worker container A message queue container Running these containers individually with  docker run  commands becomes unmanageable quickly. You need to remember the correct order to start them. You need to configure networks so they can find each other. You need to mount volumes for persistent data. You need to document all these commands. Docker Compose solves this problem. It lets you define your entire multi-container application in a single YAML file. With o...