docker-compose/tests/fixtures/networks/docker-compose.yml

version: 2

services:
  web:
    image: busybox
    command: top
    networks: ["front"]
  app:
    image: busybox
    command: top
    networks: ["front", "back"]
  db:
    image: busybox
    command: top
    networks: ["back"]

networks:
  front: {}
  back: {}