Docker Compose file cheatsheet

Docker Compose file: Volumes and networks

5 common Docker Compose file tasks.

Use a named volume

Persist data in a volume managed by Docker.

services:
  db:
    volumes:
      - pgdata:/var/lib/postgresql
volumes:
  pgdata:

Mount source code into a container for development. :ro makes it read-only.

volumes:
  - ./src:/app/src
  - ./config.yml:/app/config.yml:ro

Mount temporary storage in memory.

tmpfs:
  - /tmp

Isolate services: the proxy can reach the app, but not the database.

services:
  proxy:
    networks: [frontend]
  app:
    networks: [frontend, backend]
  db:
    networks: [backend]
networks:
  frontend:
  backend:

Attach to a network created outside this file.

networks:
  shared:
    external: true