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)
1
Part 1: Introduction and Setup
5
Part 2: Helm Chart Development
12
Part 3: Advanced Deployment Patterns

Helm Dependency Management

As you may recall from Chapter 4, Scaffolding a New Helm Chart, the Helm chart we are developing, guestbook, will deploy two primary components. The first is a Redis backend, which is used to persist a list of messages. The second component is the frontend, where the user enters the messages in a text box. In this chapter, we will focus on updating our Helm chart to deploy the first major component – Redis.

To deploy Redis, you may assume that we will need to make vast modifications to our existing guestbook chart. However, this is not necessarily the case. There are many Redis Helm charts available in Artifact Hub, and as a result, we can use the dependency management features of Helm and declare one of those charts as a dependency. Then, when the guestbook chart has been installed in a Kubernetes cluster, the dependency is also installed. By declaring Redis as a dependency, we can reduce the amount of effort required to create the backend for...