How large is your cluster currently?

> One thing that I did not realise initially is that it is absolutely vital to 
> be diligent about securing the etcd peer and client communication. In a 
> single-node setup you can get away with binding to localhost, but if you put 
> etcd on the network and do not require authentication anyone who can reach it 
> can subvert any and all Kubernetes authorization. You probably also don't 
> want to use the same CA as for Kubernetes here. Only the kube-apiserver needs 
> etcd client access. For the same reason, you should not ever use this etcd 
> cluster for anything else. Run a new cluster inside of Kubernetes instead.

+1! We're using an internal PKI setup for all our intra-cluster communication.

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