CKA Certification Course 2025 - Day 38: Admission Controllers in Kubernetes | Mutating & Validating | CKA Course 2025

Day 38: Admission Controllers in Kubernetes | Mutating & Validating | 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 38!* Today we explore one of the most powerful layers of control in the Kubernetes API lifecycle: Admission Controllers. These plugins let you mutate or validate API requests before they are persisted to etcd — giving you fine-grained control over what gets admitted into your cluster. 📝 *What We’ll Cover:* ✅ What are Admission Controllers and how they work ✅ Difference between Mutating and Validating types ✅ How to list, enable, and disable admission plugins in kube-apiserver ✅ Understanding custom webhooks: architecture, use cases, and caveats ✅ Sequence of execution for admission plugins ✅ Security considerations in multi-tenant clusters 💡 By the end of this lecture: You’ll be confident in identifying when and how admission controllers are triggered, how they enforce security and policy, and how to evaluate the right tooling (built-in vs webhook-based) for your Kubernetes use case. 🔗 *Stay Connected:* 👉 LinkedIn: https://linkedin.com/in/varun-joshi-2b516752 👉 GitHub: https://github.com/CloudWithVarJosh 💬 Got questions? Drop them in the comments — I’ll reply ASAP! 🔥 Don’t forget to like, share, and subscribe to stay updated with the CKA 2025 series! ⏰ *Timestamps:* 00:00:00 – Introduction 00:00:36 – What Is Admission Control in Kubernetes? 00:24:22 – Built-In vs Custom Admission Controllers 00:29:39 – Hands-On Demo: Enabling and Disabling Admission Plugins 00:36:25 – Webhook Authorization vs Webhook Admission 00:45:26 – Real-World Usage: How Enterprises Configure Admission Controllers 00:46:37 – Execution Order of Mutating and Validating Controllers 00:52:16 – Outro & Next Steps 🔖 *Hashtags:* #Kubernetes #CKA #CloudWithVarJosh #CKACourse #CKA2025 #CKAExam #AdmissionControllers #KubernetesSecurity #MutatingAdmissionWebhook #ValidatingAdmissionWebhook #OPA #Gatekeeper #Kyverno #KubernetesTraining #K8sAPI #ClusterSecurity #DevOps #WebhookAuthorization #SecureKubernetes