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kuberneteskubernetes-helm

How do I upgrade a helm chart with a new values.yaml and keep the previous deployments data?

I deployed a helm chart using config-v1.yaml. I added some data to my helm chart app via an api exposed in the helm chart

I want to deploy/update the current chart with values from config-v2.yaml because there is a feature I want to expose.

When I use helm upgrade -f config-v2.yaml my-chart stable/chart. The previous helm version is blown away meaning the data I added with the API is gone. So I figure I need to add a volume to my container.

When I add a PersistentVolume and PersistentVolumeClaim, the app fails to update with values from config-v2.yaml which means I don't get the new features I want.

What is the proper way to do these types of updates to helm charts?

Solution

  • To upgrade, use '--reuse-values' flag as you are providing extra customization to the existing values.

    In your case, you can use

    helm upgrade --reuse-values -f config-v2.yaml my-chart stable/chart

    Please refer the docs.