'How to migrate StatefulSet to different nodes?

I have a Kubernetes cluster of 3 nodes in Amazon EKS. It's running 3 pods of Cockroachdb in a StatefulSet. Now I want to use another instance type for all nodes of my cluster. So my plan was this:

  1. Add 1 new node to the cluster, increase replicas in my StatefulSet to 4 and wait for the new Cockroachdb pod to fully sync.
  2. Decommission and stop one of the old Cockroachdb nodes.
  3. Decrease replicas of the StatefulSet back to 3 to get rid of one of the old pods.
  4. Repeat steps 1-3 two more times.

Obviously, that doesn't work because StatefulSet deletes most recent pods first when scaling down, so my new pod gets deleted instead of the old one. I guess I could just create a new StatefulSet and make it use existing PVs, but that doesn't seem like the best solution for me. Is there any other way to do the migration?

kubernetesamazon-ekscockroachdbkubernetes-statefulset


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