nfs/statefulset-nfs.yaml

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: statefulset-nfs
  labels:
    app: nginx
spec:
  serviceName: statefulset-nfs
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: statefulset-nfs
          image: nginx
          command:
            - "/bin/sh"
            - "-c"
            - while true; do echo $(date) >> /mnt/nfs/outfile; sleep 1; done
          volumeMounts:
            - name: persistent-storage
              mountPath: /mnt/nfs
  updateStrategy:
    type: RollingUpdate
  selector:
    matchLabels:
      app: nginx
  volumeClaimTemplates:
    - metadata:
        name: persistent-storage
        annotations:
          volume.beta.kubernetes.io/storage-class: nfs
      spec:
        accessModes: ["ReadWriteMany"]
        resources:
          requests:
            storage: 10Gi