If you are using a released version of Kubernetes, you should refer to the docs that go with that version.
The latest 1.0.x release of this document can be found [here](http://releases.k8s.io/release-1.0/docs/getting-started-guides/coreos.md).Documentation for other releases can be found at releases.k8s.io.
Getting started on CoreOS
There are multiple guides on running Kubernetes with CoreOS:
- Multi-node Cluster
- Setup Multi-node Cluster on Google Compute Engine in an easy way
- Multi-node cluster using cloud-config and Weave on Vagrant
- Multi-node cluster using cloud-config and Vagrant
- Yet another multi-node cluster using cloud-config and Vagrant (similar to the one above but with an increased, more aggressive focus on features and flexibility)
- Multi-node cluster with Vagrant and fleet units using a small OS X App
- Resizable multi-node cluster on Azure with Weave