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README.md

Volume Modification via VolumeAttributesClass

Prerequisites

This example will only work on a cluster with the VolumeAttributesClass feature enabled. For more information see the installation instructions in the EBS CSI ModifyVolume documentation.

Usage

  1. Deploy the example Pod, PersistentVolumeClaim, and StorageClass to your cluster

    $ kubectl apply -f manifests/pod-with-volume.yaml

storageclass.storage.k8s.io/ebs-sc created
persistentvolumeclaim/ebs-claim created
pod/app created

  2. Wait for the PersistentVolumeClaim to bind and the pod to reach the Running state

    $ kubectl get pvc ebs-claim
NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGEebs-claim   Bound    pvc-076b2d14-b643-47d4-a2ce-fbf9cd36572b   100Gi      RWO            ebs-sc         <unset>                 2m51s

$ kubectl get pod app
NAME   READY   STATUS    RESTARTS   AGE
app    1/1     Running   0          3m24

  3. Watch the logs of the pod

    $ kubectl logs -f app
Mon Feb 26 22:28:19 UTC 2024
Mon Feb 26 22:28:24 UTC 2024
Mon Feb 26 22:28:29 UTC 2024
Mon Feb 26 22:28:34 UTC 2024
Mon Feb 26 22:28:39 UTC 2024
...

  4. Simultaneously, deploy the VolumeAttributesClass and edit the PersistentVolumeClaim to point to this class

    $ kubectl patch pvc ebs-claim --patch '{"spec": {"volumeAttributesClassName": "io2-class"}}'
persistentvolumeclaim/ebs-claim patched

  5. Wait for the VolumeAttributesClass to apply to the volume

    $ kubectl get pvc ebs-claim
NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGE
ebs-claim   Bound    pvc-076b2d14-b643-47d4-a2ce-fbf9cd36572b   100Gi      RWO            ebs-sc         io2-class               5m54s

  6. (Optional) Delete example resources

    $ kubectl delete -f manifests 
storageclass.storage.k8s.io "ebs-sc" deleted
persistentvolumeclaim "ebs-claim" deleted
pod "app" deleted
volumeattributesclass.storage.k8s.io "io2-class" deleted