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?
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.