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db: image: postgres:latest environment: - POSTGRES_USER=myuser - POSTGRES_PASSWORD=mypassword volumes: - db-data:/var/lib/postgresql/data

In this guide, we've covered the essential concepts and practical applications of Docker Compose. With Docker Compose, you can simplify the management of complex containerized applications, making it an essential tool for developers.

volumes: db-data: In this example, we define two services: web and db . The web service uses the nginx:latest image and exposes port 80. It also depends on the db service and sets environment variables for the database connection. The db service uses the postgres:latest image and sets environment variables for the PostgreSQL database.

version: '3' services: web: image: nginx:latest ports: - "80:80" depends_on: - db environment: - DATABASE_HOST=db - DATABASE_USER=myuser - DATABASE_PASSWORD=mypassword