CKA Certification Course 2025 - Day 54: Build a Multi-Node Kubernetes Cluster with kubeadm & Calico Operator | CKA Course 2025

Day 54: Build a Multi-Node Kubernetes Cluster with kubeadm + Calico Operator | 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 👉 Kubernetes Projects: https://www.youtube.com/playlist?list=PLmPit9IIdzwSv2zwizysG6OwWUACpQFN0 📚 Welcome to Day 54! Today we’ll build a multi-node Kubernetes v1.32 cluster with kubeadm, containerd, and the Calico Operator. We’ll create the control plane first, then join worker nodes, wire up networking, and validate with a quick NodePort test. I’ll demo the exact security group/firewall rules and a clean, repeatable install flow you can run in AWS—or any VMs that can reach each other. 🛠 What You’ll Learn in This Demo ✅ The “golden path” for kubeadm v1.32 on Ubuntu (swap, sysctls, containerd) ✅ Precise security group / firewall rules for control plane & workers ✅ Installing Calico via the Tigera Operator (defaults, minimal CR) ✅ Initializing the control plane and joining worker nodes ✅ Exposing an app with NodePort and validating cross-node traffic ✅ Quick stabilization tips and a reset-to-clean-slate routine 💡 By the end of this lecture: You’ll have a working multi-node cluster you can recreate on demand, understand the networking ports that make it work, and be ready for the upgrade we’ll tackle next. 🔗 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 00:01:48 — Prerequisites 00:03:52 — Demo overview: build a multi-node K8s cluster (v1.32) 00:04:28 — What we’re building & firewall/SG rules 00:12:03 — AWS console walkthrough: control plane & data plane Security Groups 00:16:54 — Create control plane node 00:20:53 — Configure control plane node 00:44:20 — Create & configure worker nodes 01:01:12 — Final verification 01:03:08 — Outro & next steps 🔖 Hashtags #Kubernetes #CKA #CKA2025 #kubeadm #Calico #TigeraOperator #K8sNetworking #DevOps #Containerd #SecurityGroups #NodePort #K8sCluster #CloudWithVarJosh #CKACourse #SRE