How Can I Verify Whether My Persistent Volume Claim Is Working?

Question

How can I check if my Persistent Volume Claim (PVC) is working correctly?

Environment

Container platform: Kubernetes

Answer

When you deploy the Hybrid Deployment Agent in Kubernetes, you need persistent shared storage across all worker nodes.

To set this up, you do the following:

• Specify a Storage Class (SC)
• Define a Persistent Volume (PV)
• Create a Persistent Volume Claim.

After creating the PVC, you can verify it by deploying a test Pod that mounts the PVC and writes a file to the storage.

To check your persistent shared storage, do the following:

1. Save the following YAML as test-pvc-pod.yaml.

   • The sample uses a PVC named your-data-vol-claim-name and the namespace default.
   • Modify these values as needed for your environment.

   apiVersion: v1
   kind: Pod
   metadata:
      name: test-pvc-pod
      namespace: default
   spec:
       containers:
          - name: test-pvc-container
            image: alpine
            command: ["/bin/sh"]
            args: ["-c", "echo 'Testing pvc storage is working' >> /data/$(date -u).txt; tail -f /dev/null"]
            volumeMounts:
             - name: test-storage
               mountPath: /data
       volumes:
          - name: test-storage
            persistentVolumeClaim:
              claimName: your-data-vol-claim-name
   

2. Deploy the test Pod:

   kubectl apply -f test-pvc-pod.yaml
   

3. Verify that the file was written:

   kubectl exec -it test-pvc-pod -- ls /data
   

If you see a file with a UTC timestamp in the /data directory, your PVC is working correctly.