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backend: build: ./backend ports: - "8080:8080" depends_on: - database environment: - DATABASE_URL=postgres://user:password@database:5432/database

One day, John discovered Docker Compose. He was amazed at how easy it was to define his application's services and run them with a single command. He created a docker-compose.yml file that defined his frontend, backend, and database services, and then ran docker-compose up to start his application. a developer's essential guide to docker compose pdf download

version: '3' services: frontend: build: . ports: - "80:80" depends_on: - backend environment: - BACKEND_URL=http://backend:8080 backend: build:

With Docker Compose, John was able to easily manage his application's containers and their dependencies. He could scale his services up or down as needed, and he could even use Docker Compose to run his application's tests. and database services