Augustine's Notes

Transformers Demo

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Transformers Demo

Source: https://notes.kodekloud.com/docs/CKA-Certification-Course-Certified-Kubernetes-Administrator/2025-Updates-Kustomize-Basics/Transformers-Demo/page

Summary: This article explores using Kustomize transformations for managing Kubernetes configurations, including adding labels, namespaces, and modifying container images.

Key Notes

  • In this lesson, we explore how to use several common transformations in Kustomize, including the image transformer. The demo utilizes a structured Kubernetes (K8s) directory setup containing two folders—one for API components and one for database components.
  • At the API level, you will find:
  • An API deployment YAML file
  • An API service YAML file
  • A kustomization.yaml file that imports these resources
  • Similarly, the database folder contains:
  • A Database deployment YAML file
  • A Database service YAML file
  • A dedicated kustomization.yaml file that imports the database-related Kubernetes configurations
  • At the root level, the main kustomization.yaml brings together both the API and database directories:
  • kustomize.config.k8s.io/v1beta1
  • api/
  • db/
  • Adding a Common Label
  • department: engineering
  • After saving the file, execute the following command in your terminal to build the configurations:
  • The output confirms that every resource (such as ConfigMap, Service, and Deployment) now has the new label applied. Here is a snippet of the generated output:
  • Applying Labels in Subdirectory kustomization.yaml Files
  • feature: api
  • Similarly, to add a label for the database folder, include the following in its kustomization.yaml:
  • feature: db
  • Adding a Namespace
  • kustomize build
  • Setting Name Prefixes and Suffixes

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