kubernetes - 如何为 StatefulSet 静态配置卷？

Question

我正在使用 Google Kubernetes Engine 并且想要我的 StatefulSet使用我之前创建的磁盘my-app-disk而不是为集合中的每个副本动态创建新的永久磁盘。我的配置如下:
PersistentVolume yaml:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: my-app-data
  labels:
    app: my-app
spec:
  capacity:
    storage: 60Gi
  accessModes:
    - ReadWriteOnce
  gcePersistentDisk:
    pdName: my-app-disk
    fsType: ext4

PersistentVolumeClaim yaml:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-app-data
  labels:
    app: my-app
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 60Gi
  selector:
    matchLabels:
      app: my-app

StatefulSet yaml:

apiVersion: apps/v1beta2
kind: StatefulSet
metadata:
  name: my-stateful-set
spec:
  serviceName: my-stateful-set
  replicas: 1
  selector:
    matchLabels:
      app: my-app
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: gcr.io/projectname/my-app:0.0.3
        ports:
        - containerPort: 80
          name: http
        volumeMounts:
        - name: my-app-data
          mountPath: /data
  volumeClaimTemplates:
  - metadata:
      name: my-app-data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 50Gi

Answer 1

StatefulSet将创建它自己的PersistentVolumeClaim对于每个 pod，因此您不必自己创建一个。一个 PersistentVolume和 PersistentVolumeClaim将独占绑定(bind)one to one .您的 PVC 绑定(bind)到您的卷，因此 StatefulSet 创建的任何 PVC无法绑定(bind)到您的卷，因此不会被使用。

在您的情况下，您的 PersistentVolume和 StatefulSet下面应该可以解决问题。确保删除 PersistentVolumeClaim您创建它是为了不绑定(bind)到您的 PersistentVolume .另外，请确保在您的 PV 下方和 volumeClaimTemplates 中正确设置了存储类名称。在您的 StatefulSet 上下面或 StatefulSet 制造的 PVC可能无法绑定(bind)到您的卷。
PersistentVolume.yaml :

apiVersion: v1
kind: PersistentVolume
metadata:
  name: my-app-data
  labels:
    app: my-app
spec:
  capacity:
    storage: 60Gi
  storageClassName: standard
  accessModes:
    - ReadWriteOnce
  gcePersistentDisk:
    pdName: my-app-disk
    fsType: ext4

StatefulSet.yaml :

apiVersion: apps/v1beta2
kind: StatefulSet
metadata:
  name: my-stateful-set
spec:
  serviceName: my-stateful-set
  replicas: 1
  selector:
    matchLabels:
      app: my-app
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: gcr.io/projectname/my-app:0.0.3
        ports:
        - containerPort: 80
          name: http
        volumeMounts:
        - name: my-app-data
          mountPath: /data
  volumeClaimTemplates:
  - metadata:
      name: my-app-data
    spec:
      selector:
        matchLabels:
          app: my-app
      storageClassName: standard
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 50Gi