I need to run docker inside of another docker for some reason. Mapping docker.socket is not an option, I need real docker daemon to start within docker.
Does anybody know if this is possible?
That is what jpetazzo/dind experimented with a few years ago.
Today (2018), If you want to run Docker-in-Docker today, all you need to do is:
docker run --privileged -d docker:dind
He adds:
... And that's it; you get Docker running in Docker, thanks to the official Docker image, in its "Docker-in-Docker" flavor.
You can then connect to this Docker instance by starting another Docker container linking to the first one (which is a pretty amazing thing to do).
See its official documentation.