Rancher

Rancher is a relatively new player, at the time of writing this book, it has only just hit its 1.0 release. Rancher Labs (the developers) describe Rancher (the platform) as:

"An open source software platform that implements a purpose-built infrastructure for running containers in production. Docker containers, as an increasingly popular application workload, create new requirements in infrastructure services such as networking, storage, load balancer, security, service discovery, and resource management.

Rancher takes in raw computing resources from any public or private cloud in the form of Linux hosts. Each Linux host can be a virtual machine or a physical machine. Rancher does not expect more from each host than CPU, memory, local disk storage, and network connectivity. From Rancher's perspective, a VM instance from a cloud provider and a bare metal server hosted at a colo facility are indistinguishable." - http://docs.rancher.com/rancher/

Rancher Labs also provide RancherOS—a tiny...