Run docker inside a docker container but produce containers side by side.

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

For example:

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

or start the docker and use it from a different instance

    docker run --privileged --name some-docker -d docker:dind 

    docker exec -it some-docker /bin/sh