stateful.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: nodejs-demo
spec:
  ports:
    - name: nodejs-web
      port: 8080
  type: NodePort
  selector:
    app: nodejs-demo

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nodejs-demo-pv-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 32Mi

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nodejs-demo
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nodejs-demo
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nodejs-demo
    spec:
      containers:
        - image: node:10
          name: node10
          env:
            - name: VOLUME_MOUNT
              value: /data
          volumeMounts:
            - name: demo-data
              mountPath: /data
          ports:
            - name: demo-port
              containerPort: 8080
          command:
            - /bin/bash
            - "-c"
            - "date >> /data/log.txt"
      volumes:
        - name: demo-data
          persistentVolumeClaim:
            claimName: nodejs-demo-pv-claim

---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: demo-pv-volume
spec:
  capacity:
    storage: 128Mi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"

statefulSet.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: nodejs-demo-statefulset
spec:
  ports:
    - name: nodejs-web
      port: 8080
  type: NodePort
  selector:
    app: nodejs-demo-statefulset

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nodejs-demo-statefulset
spec:
  replicas: 3
  serviceName: nodejs-demo-statefulset
  selector:
    matchLabels:
      app: nodejs-demo-statefulset
  template:
    metadata:
      labels:
        app: nodejs-demo-statefulset
    spec:
      containers:
        - image: node:10
          name: node10
          env:
            - name: DATA_VOLUME
              value: /data
          volumeMounts:
            - name: demo-data
              mountPath: /data
          ports:
            - name: demo-port
              containerPort: 8080
          command:
            - /bin/bash
            - "-c"
            - "date >> /data/log.txt; sleep 86400"
  volumeClaimTemplates:
    - metadata:
        name: demo-data
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 32Mi

volume.yaml

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
---

apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  hostPath:
    path: /mnt/data
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-pv2
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  hostPath:
    path: /mnt/data2
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-pv3
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  hostPath:
    path: /mnt/data3