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業務需要將默認的K8S存儲服務修改NFS，這里記錄一下操作記錄。

列出當前StorageClass：

kubectl get sc
NAME                   PROVISIONER                                         RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path                               Delete          WaitForFirstConsumer   false                  17d
nfs                    cluster.local/nfs-nfs-subdir-external-provisioner   Delete          Immediate              true                   6d14h

首先，將默認的名稱為local-path修改為false：

kubectl patch storageclass local-path -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'

然后，將nfs設置為默認：

kubectl patch storageclass nfs -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

操作完成之后，校驗一下，可以看到已經成功將nfs設置為默認的StorageClass選項。

kubectl get sc
NAME            PROVISIONER                                         RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path      rancher.io/local-path                               Delete          WaitForFirstConsumer   false                  17d
nfs (default)   cluster.local/nfs-nfs-subdir-external-provisioner   Delete          Immediate              true                   6d14h

Ref：https://kubernetes.io/docs/tasks/administer-cluster/change-default-storage-class/