version: "2"

networks:
  # reachable from outside
  default:
    driver: bridge
  # interconnects projects
  kiwi_hub:
    external:
      name: $KIWI_HUB_NAME

services:
  something:
    image: maintainer/repo:tag
    restart: unless-stopped
		networks:
		  - default
		  - kiwi_hub
    [...]