CKA Certification Course 2025 - Day 42: Kubernetes KUSTOMIZE Explained with Practical Demos | CKA Course 2025

Day 42: Kubernetes Kustomize Explained with Practical Demos | CKA Course 2025 👉 GitHub Repository: https://github.com/CloudWithVarJosh/CKA-Certification-Course-2025 👉 CKA 2025 Playlist: https://youtube.com/playlist?list=PLmPit9IIdzwRjqD-l_sZBDdPlcSfKqpAt&si=1JNRkoNa75AOJx0o 📚 Welcome to Day 42! In this lecture, we deep-dive into Kustomize — a native Kubernetes tool that helps manage configuration across multiple environments without relying on templating tools like Helm. We’ll explore both transformers and patching strategies, helping you understand how to make scalable, DRY, and environment-specific Kubernetes manifests. Through practical demos, you’ll learn how to customize your workloads declaratively using built-in transformers, inline patches, and file-based patches — all with clean, production-ready YAML. 📝 What We’ll Cover: ✅ What is Kustomize and why it matters in real-world environments ✅ Key difference: Kustomize vs Helm ✅ Built-in Transformers: nameSuffix, namespace, images, replicas, labels, and more ✅ Patch methods: patches, patchesJson6902, patchesStrategicMerge ✅ How Kustomize handles overrides cleanly across dev, staging, and prod ✅ Demos that show how to combine transformers and patches effectively ✅ What’s deprecated, what’s preferred, and how to migrate using kustomize edit fix 💡 By the end of this lecture: You’ll be able to build maintainable, reusable Kubernetes manifests using Kustomize — and confidently handle environment-specific overrides without duplication or risk of drift. 🔗 Stay Connected: 👉 LinkedIn: https://linkedin.com/in/varun-joshi-2b516752 👉 GitHub: https://github.com/CloudWithVarJosh 💬 Got questions? Drop them in the comments — I reply to every single one. 👍 Like, share, and subscribe to follow the entire CKA 2025 series! ⏰ Timestamps: 00:00:00 Introduction 00:00:42 Why Use Kustomize? 00:08:43 What Is Kustomize? 00:09:44 Kustomize vs Helm 00:13:31 Demo 1: Name Suffix Transformer 00:31:14 Demo 2: Adding More Built-in Transformers 00:45:19 Understanding Kustomize Patches 00:53:56 Demo 3: Using patches (Generic, Inline) 01:01:09 Demo 4: patchesJson6902 and Migration to patches 01:07:17 Demo 5: patchesStrategicMerge and Upgrade to patches 01:10:44 Outro & Next Steps 🔖 Hashtags: #Kubernetes #CKA #CloudWithVarJosh #CKACourse #CKA2025 #Kustomize #KubernetesManifests #DevOps #GitOps #KubernetesTraining #KubernetesDemo #CKAExam #K8sDeployment #YAMLTips #DeclarativeConfig #KustomizePatches #K8sOverlays #KubernetesBestPractices #KubernetesConfiguration #KubernetesTools