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Merge pull request #18355 from mesosphere/sttts-document-etcd-default

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@ -198,6 +198,16 @@ The scheduler also offers `/debug` API endpoints that may be useful:
All of the issues in the above section also apply to the Kubernetes-Mesos DCOS package builds.
The issues listed in this section apply specifically to the Kubernetes-Mesos DCOS package available from https://github.com/mesosphere/multiverse.
### Etcd
The default configuration of the DCOS Kubernetes package launches an internal etcd process **which only persists the cluster state in the sandbox of the current container instance**. While this is simpler for the first steps with Kubernetes-Mesos, it means that any cluster state is lost when the Kubernetes-Mesos Docker container is restarted.
Hence, for any kind of production-like deployment it is highly recommended to install the etcd DCOS package alongside Kubernetes-Mesos and
configure the later to use the etcd cluster. Further instructions
can be found at https://docs.mesosphere.com/services/kubernetes/#install.
This situation will eventually go away as soon as DCOS supports package dependencies and/or interactive package configuration.
### Kubectl
The following `kubectl` and `dcos kubectl` commands are not yet supported: