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website/content/zh/docs/tasks/administer-cluster/change-default-storage-class.md
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改变默认 StorageClass templates/task

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本文展示了如何改变默认的 Storage Class,它用于为没有特殊需求的 PersistentVolumeClaims 配置 volumes。

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为什么要改变默认 storage class

取决于安装模式,您的 Kubernetes 集群可能和一个被标记为默认的已有 StorageClass 一起部署。这个默认的 StorageClass 以后将被用于动态的为没有特定 storage class 需求的 PersistentVolumeClaims 配置存储。更多细节请查看 PersistentVolumeClaim 文档

预先安装的默认 StorageClass 可能不能很好的适应您期望的工作负载;例如,它配置的存储可能太过昂贵。如果是这样的话,您可以改变默认 StorageClass,或者完全禁用它以防止动态配置存储。

简单的删除默认 StorageClass 可能行不通,因为它可能会被您集群中的扩展管理器自动重建。请查阅您的安装文档中关于扩展管理器的细节,以及如何禁用单个扩展。

改变默认 StorageClass

  1. 列出您集群中的 StorageClasses

     kubectl get storageclass
    

    输出类似这样:

     NAME                 TYPE
     standard (default)   kubernetes.io/gce-pd
     gold                 kubernetes.io/gce-pd
    

    默认 StorageClass 以 (default) 标记。

  2. 标记默认 StorageClass 非默认:

    默认 StorageClass 的注解 storageclass.kubernetes.io/is-default-class 设置为 true。注解的其它任意值或者缺省值将被解释为 false

    要标记一个 StorageClass 为非默认的,您需要改变它的值为 false

     kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
    

    这里的 <your-class-name> 是您选择的 StorageClass 的名字。

  3. 标记一个 StorageClass 为默认的:

    和前面的步骤类似,您需要添加/设置注解 storageclass.kubernetes.io/is-default-class=true

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

    请注意,最多只能有一个 StorageClass 能够被标记为默认。如果它们中有两个或多个被标记为默认,Kubernetes 将忽略这个注解,也就是它将表现为没有默认 StorageClass。

  4. 验证您选用的 StorageClass 为默认的:

     kubectl get storageclass
    

    输出类似这样:

     NAME             TYPE
     standard         kubernetes.io/gce-pd
     gold (default)   kubernetes.io/gce-pd
    

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