Play with Docker (PWD) is a project hacked by Marcos Liljedhal and Jonathan Leibiusky and sponsored by Docker Inc.
PWD is a Docker playground which allows users to run Docker commands in a matter of seconds. It gives the experience of having a free Alpine Linux Virtual Machine in browser, where you can build and run Docker containers and even create clusters in Docker Swarm Mode.
Under the hood Docker-in-Docker (DinD) is used to give the effect of multiple VMs/PCs. In addition to the playground, PWD also includes a training site composed of a large set of Docker labs and quizzes from beginner to advanced level available at training.play-with-docker.com.
ZeroTier is a secure network overlay that allows you to manage all of your network resources as if they were on the same LAN.
The software-defined solution can be deployed in minutes from anywhere and empowers your team to create global private networks that connect your devices directly to each other, no matter where they are in the world.