StorageClass configuration

For the Cassandra database, hybrid runtime uses dynamically created persistent volumes to store data. To configure Cassandra properly, you must configure a StorageClass definition that is backed by a solid-state drive (SSD).

This topic explains how to create a new StorageClass that uses SSD and make it the default class. When Cassandra starts, it will use this default StorageClass.

Change the default StorageClass

The following steps explain how to create a StorageClass and make it the default class. For more information, see Change the default storage class in the Kubernetes documentation.

  1. Get the name of the current default StorageClass:
    kubectl get sc
      NAME                 PROVISIONER            AGE
      standard (default)   kubernetes.io/gce-pd   98d
  2. Describe the StorageClass named standard. Note that its type is pd-standard:
    kubectl describe sc standard
      Name:                  standard
      IsDefaultClass:        Yes
      Annotations:           storageclass.beta.kubernetes.io/is-default-class=true
      Provisioner:           kubernetes.io/gce-pd
      Parameters:            type=pd-standard
      AllowVolumeExpansion:  <unset>
      MountOptions:          <none>
      ReclaimPolicy:         Delete
      VolumeBindingMode:     Immediate
      Events:                <none>
  3. Create a new file called storageclass.yaml.
  4. Add this code to the file. Note that the name of the new class is apigee-sc. You can use any name you like. Also, note that the storage type is pd-ssd:
    ---
    kind: StorageClass
    apiVersion: storage.k8s.io/v1
    metadata:
      name: "apigee-sc"
    provisioner: kubernetes.io/gce-pd
    parameters:
      type: pd-ssd
      replication-type: none
    
  5. Apply the new StorageClass to your Kubernetes cluster:
    kubectl apply -f storageclass.yaml
  6. Change the default StorageClass:
    kubectl patch storageclass standard -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
    kubectl patch storageclass apigee-sc -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
    
  7. Verify that the new default StorageClass is called apigee-sc:
    kubectl get sc
      NAME                 PROVISIONER            AGE
      apigee-sc (default)  kubernetes.io/gce-pd   1d
      standard             kubernetes.io/gce-pd   98d