I have been reading for several days about how to deploy a Kubernetes cluster from scratch. It's all ok until it comes to etcd.

I want to deploy the etcd nodes inside the Kubernetes cluster. It looks there are many options, like etcd-operator (https://github.com/coreos/etcd-operator).

But, to my knowledge, a StatefulSet or a ReplicaSet makes use of a etcd.

So, what is the right way to deploy such a cluster?

My first thought: start with a single member etcd, either as a pod or a local service in the master node and, when the Kubernetes cluster is up, deploy the etcd StatefulSet and move/change/migate the initial etcd to the new cluster.

The last part sounds weird to me: "and move/change/migate the initial etcd to the new cluster."

Am I wrong with this approach?

I don't find useful information on this topic.