How do i change the default StorageClass

Question

The pre-installed default StorageClass doesn't not fit  with my application's workload. So, I want change the default StorageClass. I tried  deleting the default StorageClass, but this doesn't seem to work. It's still configured with the default StorageClass. How do i change this?

Please Help.

Answer 1

Simply deleting the default StorageClass may not work, as it may be re-created automatically by the addon manager running in your cluster. 

you might need to 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                 PROVISIONER               AGE
   standard (default)   kubernetes.io/gce-pd      1d
   gold                 kubernetes.io/gce-pd      1d

   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, a PersistentVolumeClaim without storageClassName explicitly specified cannot be created.

4. Verify that your chosen StorageClass is default:

   kubectl get storageclass

   The output is similar to this:

     NAME             PROVISIONER               AGE
     standard         kubernetes.io/gce-pd      1d
     gold (default)   kubernetes.io/gce-pd      1d