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

Creating conditionals

Conditional dependencies can be created by using the condition and tags fields of the dependencies map. The condition field is used to list Boolean values that, if present, toggle the inclusion of the dependency. Let’s explore this field first by looking at the condition-example chart located under chapter5/examples/condition-example:

  1. Observe the Chart.yaml file located at chapter5/examples/condition-example/Chart.yaml:
    $ cat chapter5/examples/condition-example/Chart.yaml
    <output omitted>
      - name: mariadb
        version: 9.5.0
        condition: mariadb.enabled

Notice that the last line of Chart.yaml in the preceding snippet uses the condition: mariadb.enabled setting. This setting allows users to set a value called mariadb.enabled to either true or false. If the value...