Painless Docker - 2nd Edition

Creating Custom Networks

By default, a network is created for all the services in a single Compose file even when it's not defined explicitly in the YAML file. However, we can create a custom network if we want to. Here is an example:

services:
    front:
        image: front-image
        networks:
            - mynet
networks:
    my_net:

Adding networks created by users can be useful when you want to:

• Define custom network settings such as driver, driver options, and name.

services:
    front:
        image: front-image
        networks:
            - mynet
networks:
    my_net:
        driver: bridge

• Create multiple networks and connect services to different networks. For example, you can create a frontend network and a backend network and connect the frontend services to the frontend network and the backend services to the backend network.

services:
    front:
        image: front-image
        networks:
            - frontend
    api:
        image: api-image
        networks:
            - backend
            - frontend
    redis:
        image: redis
        networks:
            - backend
networks:
    frontend:
    backend: