One of things I’ve been playing with of late is a Docker container orchestration system called Rancher. I’ve been very excited to discover the features and capabilities the developers have created and despite being quite new it’s extremely well polished - for the most part it just works.
One of the projects they’d developed alongside their software is an operating system called RancherOS. It’s a light weight linux installation that runs it’s userspace entirely from within containers; the init process is docker itself. This allows the systems to run with very low overhead once booted and devote as much of their resources to the serving of your containers as is possible.