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This document describes how to dynamically resize a volume (PVC) using Kubernetes and Portworx.

Pre-requisites

• Resize support for PVC is in Kubernetes 1.11 and above. If you have an older version, use pxctl volume update to update the volume size.
• The StorageClass must have allowVolumeExpansion: true.
• The PVC must be in use by a Pod.

Example

To resize a Portworx PVC, you can simply edit the PVC spec and update the size. Let’s take an example of resizing a MySQL PVC.

1. Download the MySQL StorageClass spec and apply it. Note that the StorageClass has allowVolumeExpansion: true
2. Download the MySQL PVC spec and apply it. We will start with a 5GB volume.
3. Download the MySQL Deployment spec and apply it. Wail till the pod becomes ¹⁄₁ and then proceed to next step.
4. Run kubectl edit pvc mssql-data and change the size in the “spec” to 10Gi.

After you save the spec, kubectl describe pvc mssql-data should have an entry like below that confirms the volume resize.

Normal  VolumeResizeSuccessful  5s    volume_expand                ExpandVolume succeeded for volume default/mssql-data

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