Statefullset 실습 질문입니다.

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx # .spec.template.metadata.labels 와 일치해야 한다
  serviceName: "nginx"
  replicas: 3 # 기본값은 1
  minReadySeconds: 10 # 기본값은 0
  template:
    metadata:
      labels:
        app: nginx # .spec.selector.matchLabels 와 일치해야 한다
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: k8s.gcr.io/nginx-slim:0.8
        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

다음과 같이 작성해서 create 했는데,

$ kubectl describe pvc
Name:          www-web-0
Namespace:     default
StorageClass:
Status:        Pending
Volume:
Labels:        app=nginx
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:
Access Modes:
VolumeMode:    Filesystem
Used By:       web-0
Events:
  Type    Reason         Age                    From                         Message
  ----    ------         ----                   ----                         -------
  Normal  FailedBinding  4m23s (x242 over 64m)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set



describe pvc에서 Failed가 나옵니다..

에러 메세지를 찾아봐서 StorageClassName을 = "" 으로 수정해봤는데  같은 에러 메세지가 나오네요.

어디를 확인해봐야할까요?

감사합니다.