Mar 8
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In Day 11 of the Kustomization Full Course, we deep-dive into one of the most misunderstood but exam-critical topics for Kubernetes administrators: Namespace Transformer in Kustomize This session is designed specifically for CKA aspirants and DevOps engineers who want clean, reusable, and exam-safe manifests. 🎯 What you will learn in this video ✅ What is Namespace Transformer (simple & exam-oriented) ✅ Why Namespace Transformer exists ✅ How Namespace Transformer works internally ✅ Does it work while creating resources? ✅ Why namespace must already exist ✅ What happens if namespace does NOT exist ✅ Where Namespace Transformer does NOT work ✅ Cluster-scoped vs Namespace-scoped resources ✅ Immutable namespace concept (CKA trap) ✅ KillerCoda live demo (step-by-step) Common CKA Exam Traps Covered ❌ Using kubectl apply -f instead of -k ❌ Assuming Namespace Transformer creates namespaces ❌ Trying to move existing resources to another namespace ❌ Expecting ClusterRole / PV to get namespace ❌ Hardcoded namespaces inside YAML Demo Folder Structure (Used in Video) ns-demo/ ├── deployment.yaml ├── service.yaml └── kustomization.yaml YAML FILES USED IN THIS VIDEO 🔹 deployment.yaml apiVersion: apps/v1 kind: Deployment metadata: name: web spec: replicas: 1 selector: matchLabels: app: web template: metadata: labels: app: web spec: containers: - name: nginx image: nginx 🔹 service.yaml apiVersion: v1 kind: Service metadata: name: web-svc spec: selector: app: web ports: - port: 80 targetPort: 80 🔹 kustomization.yaml apiVersion: kustomize.config.k8s.io/v1beta1 kind: Kustomization namespace: dev resources: - deployment.yaml - service.yaml 🧪 KillerCoda / Lab Commands Used Create namespace (mandatory) kubectl create namespace dev Apply using Kustomize kubectl apply -k . Verify resources kubectl get all -n dev 🧠 Key Exam Rule (Must Remember) Namespace Transformer does NOT create namespaces Namespace must already exist Namespace cannot be changed once resource is created 🧑🎓 Who should watch this? ✔ CKA 2026aspirants ✔ DevOps engineers ✔ Kubernetes beginners learning Kustomize ✔ Anyone confused about namespaces in Kubernetes ✔ KillerCoda / Hands-on lab learners 📌 Part of Playlist Kustomization Full Course – From Zero to CKA Level 👍 Like | Share | Subscribe I