This repo is not in alignment with current versions of Kubernetes, and will not be active in the future. The CoreOS Kubernetes documentation has been moved to the tectonic-docs repo, where it will be published and updated.
For tested, maintained, and production-ready Kubernetes instructions, see our Tectonic Installer documentation. The Tectonic Installer provides a Terraform-based Kubernetes installation. It is open source, uses upstream Kubernetes and can be easily customized.