The Helm Diff Plug-In
Learn how to use the Helm Diff plug-in.
We'll cover the following...
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). :
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{{/*Generic labels for each Kubernetes resource*/}}{{- define "app.labels" -}}app.kubernetes.io/name: {{ include "app.fullName" . }}app.kubernetes.io/version: {{ .Release.Name }}-{{ .Release.Revision }}app: {{ include "app.fullName" . }}group: {{ .Values.app.group }}app.fullName: {{ include "app.fullName" . }}{{- end }}
To find out how this change will affect our currently active Helm release we only need to run the helm diff upgrade command followed by the namespace and chart names. ...