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

Altering dependency names and values

When you include a dependency within a chart, you will most likely need to alter some of its values. One way to alter a dependency’s values is to override them under a map whose root has the same name as the dependency.

For example, consider the basic-fields chart located under chapter5/examples/basic-fields. This chart contains one dependency in the Chart.yaml file:

  - name: mariadb
    version: 9.5.0

To override the values from the mariadb chart, you could incorporate a values structure, similar to the following:

    repository: my-mariadb
    tag: my-tag

This will override the image.registry, image.repository, and image.tag values from the mariadb...