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Self-Study: Package Manager for Containers - Helm Chart Deep Dive (3.12)

Brief

This self-study module explores Helm Charts, focusing on how to create, customize, and manage them efficiently. You will learn about Helm’s templating system, values.yaml configurations, and packaging Helm Charts for Kubernetes deployment.

Readings

  1. Helm Chart Structure
  2. Learn the directory structure of a Helm Chart and how each file contributes to deployment.
  3. Read: https://helm.sh/docs/topics/charts/
  4. Understanding values.yaml in Helm
  5. Discover how to override default settings in Helm Charts using values.yaml.
  6. Read: https://helm.sh/docs/chart_template_guide/values_files/
  7. Helm Templating Best Practices
  8. Learn how to use Helm’s Go templating system to create reusable and configurable charts.
  9. Read: https://helm.sh/docs/chart_template_guide/
  10. Packaging and Deploying Helm Charts
  11. Understand how Helm Charts are packaged, versioned, and deployed to Kubernetes clusters.
  12. Read: https://helm.sh/docs/helm/helm_package/

Key Concepts to Explore

  • Helm Chart Structure
  • Chart.yaml – Metadata about the Helm Chart.
  • values.yaml – Default configurations that can be overridden.
  • templates/ – Contains Kubernetes YAML templates for Deployments, Services, ConfigMaps, etc.
  • charts/ – Holds dependencies (subcharts).
  • Creating Custom Helm Charts
  • Using helm create <chart-name> to generate a new chart.
  • Modifying values.yaml for dynamic configurations.
  • Writing templates for Deployments, Services, and ConfigMaps.
  • Helm Templating System
  • Using Go templates to replace hardcoded values in YAML files.
  • Common template functions:
  • {{ .Values.<key> }} → Fetch values from values.yaml.
  • {{ .Release.Name }} → Gets the release name.
  • {{ include "chart.fullname" . }} → Reusing templates across files.
  • Managing Helm Releases
  • Installing a Helm Chart: helm install my-app ./my-chart
  • Listing installed Helm releases: helm list
  • Upgrading a release: helm upgrade my-app ./my-chart
  • Rolling back a release: helm rollback my-app 1
  • Uninstalling a release: helm uninstall my-app
  • Helm Chart Packaging and Repositories
  • Packaging Helm Charts into .tgz files using helm package my-chart.
  • Hosting Helm Charts in a private repository like ChartMuseum, Harbor, or AWS ECR.

Helpful Links (References)

  1. Helm Official Documentation
  2. Learn about Helm, its commands, and best practices.
  3. https://helm.sh/docs/
  4. Using Helm for Kubernetes Deployments
  5. A detailed guide on how Helm simplifies Kubernetes application management.
  6. https://kubernetes.io/docs/helm/
  7. Helm Templates - Best Practices
  8. Explore best practices for writing efficient Helm templates.
  9. https://helm.sh/docs/chart_template_guide/best_practices/
  10. Deploying Helm Charts on AWS EKS
  11. Learn how to use Helm with Amazon Elastic Kubernetes Service (EKS).
  12. https://docs.aws.amazon.com/eks/latest/userguide/helm.html

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