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 hook life cycle

As you saw regarding the job hook in the previous section, the point at which the job was executed was based on the value of the helm.sh/hook annotation. Since post-install was specified, the job was executed once all the associated resources were created as part of the release. The post-install option represents one of the points during the life span of a Helm chart where a hook can be executed.

The following table describes the available options for the helm.sh/hook annotation. A description of each hook can be found in the official Helm documentation, which can be found at https://helm.sh/docs/topics/charts_hooks/#the-available-hooks:

Annotation Value

Description

pre-install

Executes after templates are rendered but before any resources are created in Kubernetes.

post-install

Executes...