As part of a StatefulSet, volumeClaimTemplates can provide persistent storage using PersistentVolumes provisioned by a PersistentVolume provisioner of your choice. In this recipe, we will use StorageClass to dynamically create PVs for your application. Let's begin with the following steps:

1. Add the aws-gp2 storage class line under the volumeClaimTemplates section of your application deployment manifest, similar to the following example:  

...
  volumeClaimTemplates:
  - metadata:
      name: datadir
      annotations:
        volume.beta.kubernetes.io/storage-class: aws-gp2
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 1G
...

2. In this recipe, we will deploy the Redis StatefulSet using the aws-gp2 storage class. Review the YAML manifest under the src/chapter5/aws directory in the example repository before we execute it:

$ cat aws/redis-statefulset.yml

3. Create the Redis StatefulSet using the following example:

$ kubectl apply -f aws/redis-statefulset.yml

4. Verify that pods have been created. In this recipe, our example has StatefulSet with three replicas. As a result, you should see three replicas running, similar to the following output:

$ kubectl get pods
NAME READY STATUS  RESTARTS AGE
rd-0 1/1   Running 0        9m9s
rd-1 1/1   Running 0        7m56s
rd-2 1/1   Running 0        6m47s

5. List the PVC and PVs created. You should expect to see three PVCs and three PVs created similar to our example output here:

$ kubectl get pvc,pv
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
datadir-rd-0 Bound pvc-8a538aa3-7382-4147-adde-1ea3dbaaafb4 1Gi RWO aws-gp2 10m
datadir-rd-1 Bound pvc-171fbee3-39bf-4450-961f-6c1417ff3897 1Gi RWO aws-gp2 9m1s
datadir-rd-2 Bound pvc-b40df89b-5349-4f02-8510-917012579746 1Gi RWO aws-gp2 7m52s$ 
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pvc-171fbee3-39bf-4450-961f-6c1417ff3897 1Gi RWO Retain Bound default/datadir-rd-1 aws-gp2 9m18s
pvc-8a538aa3-7382-4147-adde-1ea3dbaaafb4 1Gi RWO Retain Bound default/datadir-rd-0 aws-gp2 10m
pvc-b40df89b-5349-4f02-8510-917012579746 1Gi RWO Retain Bound default/datadir-rd-2 aws-gp2 8m10s

Now, you know how to dynamically create persistent volumes as part of your deployment.