Docker has taken the direction of a loose collection of tools tied together by an integrated interface. So you have the choice of using the platform as a whole,

Docker has taken the direction of a loose collection of tools tied together by an integrated interface. So you have the choice of using the platform as a whole, or standing up your choice of individual components on their own, without any dependency on Docker. Based on your comment, you're probably not the target audience for the platform. I recommend checking out some of the components to see if they meet your criteria of simplicity. A few examples: https://runc.io https://runc.io https://containerd.tools https://containerd.tools https://github.com/docker/swarmkit https://github.com/docker/swarmkit https://github.com/docker/notary https://github.com/docker/notary https://github.com/docker/infrakit https://github.com/docker/infrakit https://github.com/docker/hyperkit https://github.com/docker/hyperkit We are continuing the work of carving out more and more usable components from the platform.