业务需要将默认的K8S存储服务修改NFS，这里记录一下操作记录。

列出当前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，将默认的名称为local-path修改为false：

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

然后，将nfs设置为默认：

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

操作完成之后，校验一下，可以看到已经成功将nfs设置为默认的StorageClass选项。

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/