docker-compose network thing.

gistfile1.txt

version: "3.4"

services:
  spawner:
    image: docker
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    entrypoint: |
      sh -c "docker run --rm --name childcontainer --network ${stack}_default -d alpine sleep 10 && ping childcontainer"
      
# dump it in a folder and run it with:
#   stack=$(basename $PWD) docker-compose up
#
# spawner will come up, create a child container on the compose file's default network and ping it until stopped 
# childcontainer evaporates after 10 seconds