access the parent docker daemon from the container

recently i have a need to build/start/stop some sibling containers (vs docker within docker), the way to do it is to expose a pipelien from the host to the container:

for single container:

docker run -v /var/run/docker.sock:/var/run/docker.sock

for docker compose

services:
container-to-control-other-sibling-containers:
image: xyz
build:
context: .folder/to/the/controller/container/image
ports:
- 5000:5000
volumes:
- ./:/app
- /var/run/docker.sock:/var/run/docker.sock


View at Medium.com

actually the dameon could listen from other host (configuration):
https://docs.docker.com/v17.09/engine/admin/#configure-the-docker-daemon