kops/docs/changing_configuration.md

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## Changing a cluster configuration
(This procedure is currently unnecessarily convoluted. Expect it to get streamlined!)
* Edit the cluster spec: `kops edit cluster ${NAME}`
* View the changes you are going to apply `kops update cluster ${NAME}`
* Apply the changes for real `kops update cluster ${NAME} --yes`
* See which nodes need to be restarted `kops rolling-update cluster ${NAME}`
* Apply the rolling-update `kops rolling-update cluster ${NAME} --yes`
NOTE: rolling-update does not yet perform a real rolling update - it just shuts down machines in sequence with a delay;
there will be downtime [Issue #37](https://github.com/kubernetes/kops/issues/37)
We have implemented a new feature that does drain and validate nodes. This feature is experimental, and you can use the new feature by setting `export KOPS_FEATURE_FLAGS="+DrainAndValidateRollingUpdate"`.