A Developer's Essential Guide To Docker Compose Pdf Jun 2026

| Problem | Command to investigate | |---------|------------------------| | Container exits immediately | docker compose logs <service> | | Can't connect between services | docker compose exec app ping db | | Volume not persisting | docker compose exec db ls -la /var/lib/postgresql/data | | Port already in use | docker compose down then lsof -i :3000 | | Image build failing | docker compose build --progress=plain |

: Defines individual containers, such as your backend API or a PostgreSQL database. a developer's essential guide to docker compose pdf

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

Lists the status of all running services in the current stack. docker compose logs -f Streams real-time log output from all services. docker compose exec sh Opens a terminal inside a running service container. Development Best Practices docker compose logs -f Streams real-time log output

With Compose, you use a YAML file (usually named docker-compose.yml ) to configure your application’s services, networks, and volumes. Then, with a single command, you create and start all the services from your configuration.

docker compose up → entire stack starts in isolation.

db: image: postgres:15 volumes: - postgres_data:/var/lib/postgresql/data environment: POSTGRES_PASSWORD: example