Book Image

Managing Kubernetes Resources Using Helm - Second Edition

By : Andrew Block, Austin Dewey
Book Image

Managing Kubernetes Resources Using Helm - Second Edition

By: Andrew Block, Austin Dewey

Overview of this book

Containerization is one of the best ways to implement DevOps, and learning how to execute it effectively is an essential part of a developer’s skillset. Kubernetes is the current industry standard for container orchestration. This book will help you discover the efficiency of managing applications running on Kubernetes with Helm. Starting with a brief introduction to Helm and its impact on users working with containers and Kubernetes, you’ll delve into the primitives of Helm charts and their architecture and use cases. From there, you’ll understand how to write Helm charts in order to automate application deployment on Kubernetes and work your way toward more advanced strategies. These enterprise-ready patterns are focused on concepts beyond the basics so that you can use Helm optimally, looking at topics related to automation, application development, delivery, lifecycle management, and security. By the end of this book, you’ll have learned how to leverage Helm to build, deploy, and manage applications on Kubernetes.
Table of Contents (18 chapters)
Part 1: Introduction and Setup
Part 2: Helm Chart Development
Part 3: Advanced Deployment Patterns


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...