k8s报错: * spec.template.spec.volumes[0].name: Invalid value: "nfs_pvc001": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])? (e.g. 'my-name' or '123-abc')

[root@k8s-master ~]# vim nginx-deploy.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 4
  template:
▽   metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.10:5000/nginx:1.15
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nfs_pvc001
          mountPath: /etc/nginx
      volumes:
      - name: nfs_pvc001
        persistentVolumeClaim:
          claimName: pvc0001


[root@k8s-master ~]# kubectl apply -f nginx-deploy.yaml 
The Deployment "nginx-deployment" is invalid: 
* spec.template.spec.volumes[0].name: Invalid value: "nfs_pvc001": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])? (e.g. 'my-name' or '123-abc')
* spec.template.spec.containers[0].volumeMounts[0].name: Not found: "nfs_pvc001"
[root@k8s-master ~]# vim nginx-deploy.yaml 
apiVersion: extensions/v1beta1

[root@k8s-master ~]# vim nginx-deploy.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 4
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.10:5000/nginx:1.15
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nfs-pvc001
          mountPath: /etc/nginx
      volumes:
      - name: nfs-pvc001
        persistentVolumeClaim:
          claimName: pvc0001