Primary change periodically

[cybercoder]

I don't know this is a bug or not.
I have created a NodePort service to the 0 instance in replicaset statefulset for external temporary connections.

apiVersion: v1
kind: Service
metadata:
  labels:
    app: mongodb-svc
  name: mongodb-svc-nodeport
  namespace: db
spec:
  ports:
  - name: mongodb
    nodePort: 30017
    port: 27017
    protocol: TCP
    targetPort: 27017
  selector:
    statefulset.kubernetes.io/pod-name: mongodb-0
  type: NodePort

But the primary node periodically changes! ( maybe voting ... )
How we can commit the 0 instance being the primary always in the replicaset?

[github-actions]

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