CoreOS is a new Linux distribution that has been rearchitected to provide features needed to run modern infrastructure stacks.
The strategies and architectures that influence CoreOS allow companies like Google, Facebook and Twitter to run their services at scale with high resilience.
CoreOS is currently in heavy development and actively being tested. These instructions will walk you through running CoreOS on VMware Fusion or ESXi. If you are familiar with another VMware product you can use them as a starting point.