block-volume

Raw Block Volume

This example shows how to consume a dynamically-provisioned EBS volume as a raw block device.

Edit Persistence Volume Claim Spec

Make sure the volumeMode is Block.

Edit Application Pod

Make sure the pod is consuming the PVC with the defined name and volumeDevices is used instead of volumeMounts.

Deploy the Application

kubectl apply -f examples/kubernetes/block-volume/specs/storageclass.yaml
kubectl apply -f examples/kubernetes/block-volume/specs/raw-claim.yaml
kubectl apply -f examples/kubernetes/block-volume/specs/pod.yaml

Access Block Device

After the objects are created, verify that pod is running:

$ kubectl get pods
NAME   READY   STATUS    RESTARTS   AGE
app    1/1     Running   0          16m

Verify the device node is mounted inside the container:

$ kubectl exec -ti app -- ls -al /dev/xvda
brw-rw----    1 root     disk      202, 23296 Mar 12 04:23 /dev/xvda

Write to the device using:

dd if=/dev/zero of=/dev/xvda bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.0492386 s, 2.1 GB/s