Docker-Compose

Networking

By default, Docker-Compose will create a new network for the given compose file. You can change the behavior by defining custom networks in your compose file.

Create and assign custom network

… Example:

networks:
  custom-network:

services:
  app:
    networks:
      - custom-network

Use existing networks

If you want to use an existing Docker network for your compose files, you can add the external: true parameter in your compose file Example:

networks:
  existing-network:
    external: true

Volumes

Volumes allow Docker containers to use persistent storage. In a compose file, you can create and map volumes like this:

volumes:
  my-volume:

services:
  app:
    volumes:
      - my-volume:/path-in-container

These volumes are stored in /var/lib/docker/volumes.