apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx-statefulset
  namespace: default
spec:
  serviceName: nginx-service
  replicas: 2
  selector:
    matchLabels:
      app: nginx-app
  template:
    metadata:
      labels:
        app: nginx-app
    spec:
      containers:
        - name: nginx-app
          image: nginx:latest
          ports:
            - containerPort: 80
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: "standard"
        resources:
          requests:
            storage: 1Gi
  updateStrategy:
    type: RollingUpdate # onDelete
    rollingUpdate:
      partition: 1