Docker in docker (dind) example

Just run:

docker-compose up

What happened?

Docker compose starts a docker engine inside a docker (dind).

Other services (node1, node2) can use this docker engine in isolation by setting the environment variable DOCKER_HOST pointing to linked (and insecure -> port 2375) docker service docker-in-docker.

Note that the output of each node shows nothing which means that the linked docker engine is actually running in isolation.