statefulset.yaml

apiVersion: v1
kind: Service
metadata:
  name: svc
  labels:
    app: demo
  namespace: demo
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: stash
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: stash-demo
  namespace: demo
spec:
  selector:
    matchLabels:
      app: demo
  serviceName: svc
  replicas: 3
  template:
    metadata:
      labels:
        app: demo # Pod template's label selector
    spec:
      containers:
      - args: ["touch source/data/sample-file.txt && sleep 3000"]
        command: ["/bin/sh", "-c"]
        name: nginx
        image: nginx
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: source-data
          mountPath: /source/data
  volumeClaimTemplates:
  - metadata:
      name: source-data
      namespace: demo
    spec:
      accessModes: 
        - ReadWriteOnce
      storageClassName: "standard"
      resources:
        requests:
          storage: 6Gi