GKE+Helm: Increasing persistent volume claim size

[Matthew Cooper]

Hi all,

I am deploying an application with Helm on Google Kubernetes Engine. In the future, the persistent volumes will likely need to grow. What should I be doing now to ensure smooth storage increases with minimal downtime to the application? What concerns regarding reclaim policy do I have for this?

Help is greatly appreciated as this application is needed quickly.


Thanks,
Matt

[Michelle Au]

Hi Matt,

In Kubernetes 1.11, the volume resizing feature is available in beta: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#expanding-persistent-volumes-claims.  Changing the PVC size will trigger the resizing of the GCE PD disk.  Once that is complete, then you need to restart your Pod using that PVC in order to trigger a filesystem resize (automatic fs resize is currently an alpha feature).  This resize feature is independent of reclaim policy.  Please let me know if you have any further questions.

Thanks,

Michelle

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[Matthew Cooper]

Thank you.

If I upgrade my cluster to V1.11 and use this feature, how does the process interact with using Helm. I'm not a seasoned expert so I'm not sure exactly what sequence I should follow to resize the file system on pods. Any examples around?