how to scale a statefulset in kubernetes

Question

What's the process involved if I need to increase the number of replicas or in other words how do I scale the statefulsets in kubernetes?

Answer 1

Scaling StatefulSets :

• Use kubectl to scale StatefulSets

• First, find the StatefulSet you want to scale.

kubectl get statefulsets <stateful-set-name>

• Change the number of replicas of your StatefulSet:

kubectl scale statefulsets <stateful-set-name> --replicas=<new-replicas>

Make in-place updates on your StatefulSets

• Alternatively, you can do in-place updates on your StatefulSets.

• If your StatefulSet was initially created with kubectl apply, update .spec.replicas of the StatefulSet manifests, and then do a kubectl apply:

kubectl apply -f <stateful-set-file-updated>

• Otherwise, edit that field with kubectl edit:

kubectl edit statefulsets <stateful-set-name>

• Or use kubectl patch:

kubectl patch statefulsets <stateful-set-name> -p '{"spec":{"replicas":<new-replicas>}}'