单Storageclass支持创建多可用区pv

CSI支持单sc多可用区pv。在有跨可用区节点的集群中，避免了由于pv所在的可用区与被调度的node的可用区不一致导致的pod pending的问题。

前提条件

组件csi-driver为2.0.4及以上版本。如需更新，请参考更新 Helm应用。

创建SC

可根据具体的需求选择不同的模式绑定pv。

延迟创建绑定

在sc的yaml中将volumeBindingMode设置为WaitForFirstConsumer，当集群的node跨zone，CSI driver能感知到pod所在的zone，会优先在对应的zone创建pv。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ssd
parameters:
  chargetype: HourlyInstantSettlement
  type: SSD3.0
provisioner: com.ksc.csi.diskplugin
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer

立刻创建绑定

在sc的yaml中将volumeBindingMode设置为Immediate，会随机选择最合适的zone的创建pv。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ssd
parameters:
  chargetype: Daily
  type: SSD3.0
provisioner: com.ksc.csi.diskplugin
reclaimPolicy: Delete
volumeBindingMode: Immediate

指定创建pv的zone

在sc的yaml中可通过allowedTopologies字段指定创建pv的可用区。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: wffc-allow
parameters:
  chargetype: Daily
  type: SSD3.0
#  zone: cn-beijing-6a
provisioner: com.ksc.csi.diskplugin
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
allowedTopologies:
    - key: failure-domain.beta.kubernetes.io/zone
      values:
        - cn-beijing-6a
        - cn-beijing-6b

创建pvc以及deployment

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ssd
  namespace: default
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ssd
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ssd-deployment
  labels:
    app: ssd
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ssd
  template:
    metadata:
      labels:
        app: ssd
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: Always
          volumeMounts:
            - name: ssd
              mountPath: /usr/share/nginx/html
      volumes:
        - name: ssd
          persistentVolumeClaim:
            claimName: ssd