Tasks

Step-by-step instructions for performing operations with Kubernetes.

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Changing the default StorageClass

This page shows how to change the default Storage Class that is used to provision volumes for PersistentVolumeClaims that have no special requirements.

Before you begin

You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube.

Why change the default storage class?

Depending on the installation method, your Kubernetes cluster may be deployed with an existing StorageClass that is marked as default. This default StorageClass is then used to dynamically provision storage for PersistentVolumeClaims that do not require any specific storage class. See PersistentVolumeClaim documentation for details.

The pre-installed default StorageClass may not fit well with your expected workload; for example, it might provision storage that is too expensive. If this is the case, you can either change the default StorageClass or disable it completely to avoid dynamic provisioning of storage.

Simply deleting the default StorageClass may not work, as it may be re-created automatically by the addon manager running in your cluster. Please consult the docs for your installation for details about addon manager and how to disable individual addons.

Changing the default StorageClass

  1. List the StorageClasses in your cluster:

     kubectl get storageclass
    

    The output is similar to this:

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

    The default StorageClass is marked by (default).

  2. Mark the default StorageClass as non-default:

    The default StorageClass has an annotation storageclass.kubernetes.io/is-default-class set to true. Any other value or absence of the annotation is interpreted as false.

    To mark a StorageClass as non-default, you need to change its value to false:

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

    where <your-class-name> is the name of your chosen StorageClass.

  3. Mark a StorageClass as default:

    Similarly to the previous step, you need to add/set the annotation storageclass.kubernetes.io/is-default-class=true.

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

    Please note that at most one StorageClass can be marked as default. If two or more of them are marked as default, Kubernetes ignores the annotation, i.e. it behaves as if there is no default StorageClass.

  4. Verify that your chosen StorageClass is default:

     kubectl get storageclass
    

    The output is similar to this:

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

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