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A Practical Guide to Helm

Introduction to Named Templates

Learn how to use named templates.

We'll cover the following...

Note: An interactive sandbox is located at the end of this lesson.

Named templates

We’ve got a very simple Helm chart with only two Kubernetes resources, Deployment and Service. If we take a closer look at them we would see that even though they’re two different resources, some of their parts are the same.

For instance, they have the same labels in a metadata property, as shown below:

YAML
metadata:
  labels: 
    app.kubernetes.io/name: {{ .Values.app.name }}
    app.kubernetes.io/version: {{ .Release.Name }}-{{ .Release.Revision }}
    app: {{ .Values.app.name }}
    group: {{ .Values.app.group }}

For now, it’s rather a simple one, but that’ll change once we start to add more resources and extend the existing parts. To reduce the number of duplicated parts of a code we can extract them and define them as named templates ( a template inside a template). ...