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db: image: postgres:15 environment: POSTGRES_USER: dev POSTGRES_PASSWORD: devpass POSTGRES_DB: myapp volumes: - db_data:/var/lib/postgresql/data healthcheck: test: ["CMD-SHELL", "pg_isready -U dev"] interval: 10s

docker compose up → entire stack starts in isolation.

volumes: db_data:

docker run ... (20 flags) docker network create ... docker volume create ... → Error-prone, slow, non-repeatable.

db: image: postgres:15 volumes: - postgres_data:/var/lib/postgresql/data environment: POSTGRES_PASSWORD: example a developer's essential guide to docker compose pdf

build --no-cache # Rebuild images pull # Pull latest images push # Push built images

logs -f # Follow logs logs --tail=100 api # Last 100 lines of 'api' exec api bash # Interactive shell ps # Show status top # Show running processes a developer's essential guide to docker compose pdf

redis: image: redis:7-alpine