We fill out a few services into our docker-compose.yml file:

version: '3'
services:
  cache:
    image: redis:alpine
    networks:
     - appnet
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: homestead
      MYSQL_USER: homestead
      MYSQL_PASSWORD: secret
    networks:
     - appnet
networks:
  appnet:
    driver: bridge
volumes:
  dbdata:
    driver: local
  cachedata:
    driver: local