Volume Expansion in LKE

Linode Staff

Does Linode Kubernetes Engine support volume expansion?

4 Replies

It sure does!

You'll want to make sure you've already deployed a Persistent Volume Claim(PVC) to your LKE Cluster. If you haven't, you can check out our Deploy Persistent Volume Claims with the Linode Block Storage CSI Driver guide to learn how.

Using that guide as an example, you should have created a PVC using the following manifest file named pvc.yaml:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-example
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: linode-block-storage-retain

To expand that PVC, all you'll need to do is update the spec.resources.requests.storage field to the newly desired size and then apply it to your cluster. So if you wanted to expand your PVC to 50GiB, your updated manifest should look like this:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-example
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 50Gi
  storageClassName: linode-block-storage-retain

All that's left to do is apply the updated manifest to your cluster using kubectl apply -f pvc.yaml and the Linode Block Storage CSI Driver will handle the rest!

Awesome! I was really looking forward to this feature. I hope it also works to shrink a volume size. Thanks!

Hey @remusmp. I'm sorry to say that shrinking volumes is not supported at this time. LKE uses the Block Storage service, and the Block Storage Volumes are what cannot be sized down. From our resizing Block Storage guide:

Storage Volumes cannot be sized down, only up. Keep this in mind when sizing your Volumes.

That said, if you resize up, you can retain your information by using linode-block-storage-retain when specifying your storageClassName in your manifest yaml file.

Hey folks,

Just wanted to provide an additional bit of insight into resizing PVCs attached to Nodes in your LKE pools.

At this time the Linode Block Storage CSI Driver does not automatically resize the filesystem when resizing the volume. So if you simply resize the claim with by updating your yaml file, you will not be able to make use of the additional storage space. To work around this, you will need to manually complete this resize.

  • Log directly into the Linode in your pool that the volume is attached to (Available in the Volumes Tab in Cloud Manager).

  • If you are unsure about how to access the Linode, check out this post on SSHing into an LKE node. There is a real nifty tool that can help you with it!

  • Once you have console access to the Linode, you will want to resize the filesystem by running the below command, replacing the sample path with your volume's:

    resize2fs /dev/disk/filesystem/path
    

The correct filesystem path for your volume is also available in your Volumes Tab in Cloud Manager.

Once you've resized the filesystem, you can use kubectl to confirm the resize by running the below command:

kubectl exec -it <service> df

This will output the disk space for your disks, including the total size, the amount used, amount available.

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