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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 FREE CHAPTER
2. Chapter 1: Understanding Kubernetes and Helm 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

Generating release notes

One special type of Helm template is called the NOTES.txt file, located in a Helm chart’s templates/ folder. This file is used to dynamically generate usage instructions (or other details) for applications once they are installed with Helm.

A NOTES.txt file uses the same exact templating syntax as Kubernetes resource templates and can be seen in the following example:

Follow these instructions to access your application.
{{- if eq .Values.serviceType "NodePort" }}
export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{.Release.Name }})
export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
echo "URL: http://$NODE_IP:$NODE_PORT
{{- else }}
export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Name }} wordpress --template "{{ range (index .status.loadBalancer.ingress...
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