CoreOS vs Kubernetes

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.
Manage a cluster of Linux containers as a single system to accelerate Dev and simplify Ops with Kubernetes by Google.
Face to face in the news:

2014 - CoreOS invented the new container technology to fight Docker to strike back at Kubernetes

For the past several months container technology Docker was on its way to becoming the de-facto standard for container technology. Now CoreOS, the Linux operating system specialist, is unveiling is own competitive technology - Rocket, kicking off what could become a container-standardization war between the two entities. CoreOS states, that Docker’s effort to develop its enterprise-oriented lineup of features has caused the company to lose sight of its goal of making sure that its core container technology is lightweight and portable. And that now Docker is competing with container-management-and-orchestration services like Google’s Kubernetes or the new Amazon EC2 Container service. Rocket is basically a container engine, like Docker, but without all the extras Docker’s been working on to make itself more enterprise friendly. These features include tools for spinning up cloud servers, the ability to have clustered systems and even networking capabilities.