Changing the default storage class to ZRS

Dynamic storage provisioning is a key part of scaling applications. When a storage class is not specified by a PVC, Kubernetes uses the default option. Let's perform the following steps to set our preferred storage class as the default:

1. Let's set the existing default storage class as the non-default option:

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

2. Now, define azure-zrs as the default storage class again:

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

3. Confirm the new default storage class. You should see new azure-zrs as the default, similar to the following output:

$ kubectl get sc
NAME                PROVISIONER AGE
azure-zrs (default) kubernetes.io/azure-disk 4m38s
default             kubernetes.io/azure-disk 23m
managed-premium     kubernetes.io/azure-disk 23m

Now you know how to set your preferred storage class as the default on your AKS cluster.