volumeClaimTemplates与PersistentVolumeClaim

看资料时看到了一个volumeClaimTemplates字段的配置，代码如下：

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apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx
  serviceName: "nginx"
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "my-storage-class"
      resources:
        requests:
          storage: 1Gi


~~~ yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
  annotations:
    volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi

---

kind: Pod
apiVersion: v1
metadata:
  name: test-pod
spec:
  containers:
  - name: test-pod
    image: busybox:1.24
    command:
      - "/bin/sh"
    args:
      - "-c"
      - "touch /mnt/SUCCESS && exit 0 || exit 1"
    volumeMounts:
      - name: nfs-pvc
        mountPath: "/mnt"
  restartPolicy: "Never"
  volumes:
    - name: nfs-pvc
      persistentVolumeClaim:
        claimName: test-claim

学习这几份配置文件，有如下疑惑点：

StatefulSet定义中得volumeMounts下并没有persistentVolumeClaim属性，而貌似是直接写了volumeClaimTemplates中的name。
PersistentVolumeClaim定义中的StorageClass是通过注解写出来的，而不是像volumeClaimTemplates使用一个字段。

其实我现在还不知道StatefulSet这份配置能不能正常的运行，而且几份配置文件针对的是不同版本的Kubernetes，所以这种差异不知道是不是版本的差异。

Kubernetes为每一个VolumeClaimTemplate创建一份PV