The Helm Diff Plug-In

The helm diff upgrade command

The help diff upgrade command is the most widely used command when we’re developing a chart. It allows us to test how our changes will affect the existing Helm release.

Let’s say that we would like to add a new annotation to all Kubernetes resources. As we may remember, it was declared in the _helpers.tpl file, therefore, we just need to add a new line there, called app.fullName (remove lines 16 and 18 from the same file in the playground located at the end of this lesson). :