Augustine's Notes

Common Transformers

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Common Transformers

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

Summary: Learn to use Kustomize transformers for modifying Kubernetes configurations, focusing on common transformations for consistent resource management.

Key Notes

  • In this lesson, you will learn how to use Kustomize transformers to modify Kubernetes configurations. Kustomize supports several built-in transformers, and you can also create custom ones. Here, we focus on a subgroup known as Common Transformers.
  • Imagine you have multiple YAML files such as deployment.yaml and service.yaml. You might want to apply a common configuration—for example, adding a label like “org: KodeKloud” or appending “-dev” to resource names—across all these files. Manually updating each file in a production environment isn’t scalable or efficient. Kustomize transformers offer a systematic way to make consistent changes across all resources.
  • Below are the original Kubernetes resource examples:
  • apps/v1
  • “TCP”
  • After applying Kustomize transformations, the resources might look like this:
  • api-deployment-dev
  • Kustomize transformers are essential for ensuring that your Kubernetes configurations remain consistent and manageable across various environments.
  • Common Transformation Methods
  • Below is an overview of common transformations available in Kustomize for managing Kubernetes resources:
    1. Common Label Transformation
  • kustomization.yaml
  • For example, a transformed Service resource would appear as:
    1. Namespace Transformation
  • After this transformation, a Service resource might look like:
  • When applying namespace transformations, ensure that the specified namespace exists in your cluster to avoid deployment issues.
    1. Name Prefix and Suffix Transformation
  • After applying this configuration, a Service resource would be renamed to “KodeKloud-api-service-dev”:
  • KodeKloud-api-service-dev
    1. Common Annotation Transformation
  • This transformation results in a Service resource similar to:
  • The common transformations available in Kustomize include:
  • Transformation Type
  • Common Label Transformation

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