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Managing Kubernetes Resources Using Helm

You're reading from   Managing Kubernetes Resources Using Helm Simplifying how to build, package, and distribute applications for Kubernetes

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Product type Paperback
Published in Sep 2022
Publisher Packt
ISBN-13 9781803242897
Length 310 pages
Edition 2nd Edition
Tools
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Authors (2):
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Andrew Block Andrew Block
Author Profile Icon Andrew Block
Andrew Block
Austin Dewey Austin Dewey
Author Profile Icon Austin Dewey
Austin Dewey
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Table of Contents (18) Chapters Close

Preface 1. Part 1: Introduction and Setup
2. Chapter 1: Understanding Kubernetes and Helm FREE CHAPTER 3. Chapter 2: Preparing a Kubernetes and Helm Environment 4. Chapter 3: Installing Your First App with Helm 5. Part 2: Helm Chart Development
6. Chapter 4: Scaffolding a New Helm Chart 7. Chapter 5: Helm Dependency Management 8. Chapter 6: Understanding Helm Templates 9. Chapter 7: Helm Lifecycle Hooks 10. Chapter 8: Publishing to a Helm Chart Repository 11. Chapter 9: Testing Helm Charts 12. Part 3: Advanced Deployment Patterns
13. Chapter 10: Automating Helm with CD and GitOps 14. Chapter 11: Using Helm with the Operator Framework 15. Chapter 12: Helm Security Considerations 16. Index 17. Other Books You May Enjoy

Writing hooks in the Guestbook Helm chart

As you may recall, the Guestbook Helm chart uses a Redis database to persist messages created by the user. Using Helm hooks, we can create a process that performs simple backup and restore processes of the Redis database at various points of the chart’s life cycle. Let’s take a look at the two hooks that we will create in this section:

  • The first hook will occur in the pre-upgrade lifecycle phase. This phase takes place immediately after the helm-upgrade command is run, but before any Kubernetes resources have been modified. This hook will be used to take a data snapshot of the Redis database before the upgrade is performed, ensuring that the database is backed up in case any errors occur during the upgrade.
  • The second hook will occur in the pre-rollback lifecycle phase. This phase takes place immediately after the helm-rollback command is run, but before any Kubernetes resources are reverted. This hook will restore...
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