If you are using a released version of Kubernetes, you should refer to the docs that go with that version.
The latest release of this document can be found [here](http://releases.k8s.io/release-1.1/examples/kubectl-container/README.md).Documentation for other releases can be found at releases.k8s.io.
This directory contains a Dockerfile and Makefile for packaging up kubectl into a container.
It's not currently automated as part of a release process, so for the moment this is an example of what to do if you want to package kubectl into a container/your pod.
In the future, we may release consistently versioned groups of containers when we cut a release, in which case the source of gcr.io/google_containers/kubectl would become that automated process.
pod.json is provided as an example of packaging kubectl as a sidecar
container, and to help you verify that kubectl works correctly in
this configuration.
A possible reason why you would want to do this is to use kubectl proxy as
a drop-in replacement for the old no-auth KUBERNETES_RO service. The other
containers in your pod will find the proxy apparently serving on localhost.