Summary

Templates represent the core of Helm’s functionality. They allow you to create a variety of different Kubernetes resource configurations by enabling dynamic YAML generation. Helm’s template engine, based on Go templates, contains several built-in objects upon which chart developers can build charts, such as the .Values and .Release objects. Templates also provide many different functions to provide robust formatting and manipulation, along with control structures for enabling conditional logic and loops. Besides rendering Kubernetes resources, templates can also be used to abstract boilerplate by using named templates and library charts.

By incorporating the capabilities provided by templates, we were able to make small modifications to the Guestbook chart at the end of the chapter by enhancing the content of the values and the deployment.yaml chart template, which resulted in the ability to deploy the Guestbook application successfully. In the next chapter...