resizing

Volume Resizing

Prerequisites

1. Kubernetes 1.13+ (CSI 1.0).
2. The aws-ebs-csi-driver installed.

Usage

In this example, an EBS volume of 4Gi is resized to 8Gi using the volume resizing feature.

1. Deploy the provided pod on your cluster along with the StorageClass and PersistentVolumeClaim:

   $ kubectl apply -f manifests
   
   persistentvolumeclaim/ebs-claim created
   pod/app created
   storageclass.storage.k8s.io/resize-sc created

2. Validate the PersistentVolumeClaim is bound to your PersistentVolume.

   $ kubectl get pvc ebs-claim
   
   NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   ebs-claim   Bound    pvc-b0f6d590-f4b3-4329-a118-49cd09f6993c   4Gi        RWO            resize-sc      28s

3. Expand the volume size by increasing the capacity specification in the PersistentVolumeClaim.

   $ export KUBE_EDITOR="nano" && kubectl edit pvc ebs-claim

4. Verify that both the persistence volume and persistence volume claim have been appropriately resized:

   $ kubectl get pv && kubectl get pvc
   
   NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM               STORAGECLASS   
   pvc-b0f6d590-f4b3-4329-a118-49cd09f6993c   8Gi        RWO            Delete           Bound    default/ebs-claim   resize-sc   
   
   NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   ebs-claim   Bound    pvc-b0f6d590-f4b3-4329-a118-49cd09f6993c   8Gi        RWO            resize-sc      23m

5. Cleanup resources:

   $ kubectl delete -f manifests
   
   persistentvolumeclaim "ebs-claim" deleted
   pod "app" deleted
   storageclass.storage.k8s.io "resize-sc" deleted