Docker in Docker is simply running a Docker inside a Docker container.

You can visit the DinD site at the following link, and the official DinD docker image at the following link.

The first thing to do is run docker with some options:

docker run --rm --privileged -t -i -e LOG=file jpetazzo/dind

The privileged mode allows negotiating some features of the file system.

After starting the container, another container is run, this time from busyox, which returns "Hello new World!".

docker run busybox echo "Hello New World!"

A figure of the execution result is shown below.

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