Docker Compose quiz

Test your Docker Compose knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is Docker Compose?

1. What is Docker Compose?
2. What is a common reason a development team uses Docker Compose specifically for local development environments, even if production deployment uses a different orchestration tool like Kubernetes?
3. What does Docker Compose's automatic networking between services provide, e.g. a `web` service being able to connect to a `db` service by simply using the hostname `db`?
4. What is the difference between the `image` and `build` keys in a Docker Compose service definition?
5. What does `docker-compose down` do, and how does it differ from `docker-compose stop`?
6. What does the `ports` configuration key do in a Docker Compose service definition, e.g. `ports: - "8080:80"`?
7. What is the purpose of a `healthcheck` configuration on a Docker Compose service?
8. What is the purpose of an `.env` file used alongside a `docker-compose.yml` file?
9. What is the standard configuration file name Docker Compose looks for?
10. How would you start all services defined in a `docker-compose.yml` file?
11. What does `docker-compose logs` (optionally with `-f` for "follow") let a developer do?
12. What is the purpose of `depends_on` in a Docker Compose service definition?

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