The Chart Template Developer’s Guide

Templates generate manifest files, which are YAML-formatted resourcedescriptions that Kubernetes can understand. We’ll look at how templates arestructured, how they can be used, how to write Go templates, and how to debugyour work.

This guide focuses on the following concepts:

• The Helm template language
• Techniques for working with templates

This guide is oriented toward learning the ins and outs of the Helm templatelanguage. Other guides provide introductory material, examples, and bestpractices.

How to access files from within a template.

Appendix: Go Data Types and Templates

Built-in objects available to templates.

Creating a NOTES.txt File

How to provide instructions to your Chart users.

Troubleshooting charts that are failing to deploy.

Flow Control

A quick overview on the flow structure within templates.

Subcharts and Global Values

Interacting with a subchart's and global values.

Using functions in templates.

Values Files

Instructions on how to use the —values flag.

Using variables in templates.

YAML Techniques