Feb 9
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Learn how to build a 2-node Kubernetes cluster on your laptop using kubeadm and VirtualBox! This step-by-step tutorial is perfect for System Administrators, DevOps engineers, and Kubernetes beginners. In this video, we’ll cover: ✅ Setting up master and worker nodes on Rocky Linux VMs ✅ Installing containerd and Kubernetes tools (kubeadm, kubelet, kubectl) ✅ Configuring networking, disabling swap & firewall for lab setup ✅ Initializing the control plane and joining the worker node ✅ Installing a pod network (Flannel) ✅ Verifying your cluster with kubectl get nodes Even if you’re not using Rocky Linux, these steps apply to most Linux distributions with minor adjustments. 💡 Why this tutorial is useful: Learn real-world cluster setup, not just Minikube Practice hands-on Kubernetes administration Prepare for DevOps interviews and Kubernetes certification 📌 Resources & Links: Rocky Linux VM installation guide: [https://youtu.be/V5uaNrNMsb4] Kubernetes official docs: https://kubernetes.io/docs/home/ 📌 Watch the Full Kubeadm Labs Playlist: If you want to continue learning and building real multi-node Kubernetes clusters, check out our full playlist: [https://www.youtube.com/playlist?list=PL4y5PiOmBnA8-pXEE3Xwz28_QF-geOurS] 📌 Key Commands Used : 🔹 Disable Swap (Required for Kubernetes) sudo swapoff -a sudo vim /etc/fstab # comment the swap entry 🔹 Load Required Kernel Modules sudo modprobe overlay sudo modprobe br_netfilter echo overlay | sudo tee /etc/modules-load.d/overlay.conf echo br_netfilter | sudo tee /etc/modules-load.d/br_netfilter.conf 🔹 Kubernetes Networking sysctl Settings (Angle-Bracket Free) Create config file: sudo vim /etc/sysctl.d/k8s.conf Add the following lines: net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 Apply settings: sudo sysctl --system 🔹 Install & Configure containerd (Critical) sudo dnf install -y dnf-plugins-core sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo dnf install -y containerd.io sudo mkdir -p /etc/containerd containerd config default | sudo tee /etc/containerd/config.toml ⚠️ Important change in config.toml SystemdCgroup = true sudo systemctl enable --now containerd 🔹 Install Kubernetes Tools sudo tee /etc/yum.repos.d/kubernetes.repo Paste: [kubernetes] name=Kubernetes baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/ enabled=1 gpgcheck=1 gpgkey=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/repodata/repomd.xml.key Then install: sudo dnf install -y kubelet kubeadm kubectl sudo systemctl enable kubelet 🔹 Initialize Cluster (MASTER NODE) sudo kubeadm init \ --apiserver-advertise-address=MASTER_IP \ --pod-network-cidr=10.244.0.0/16 🔹 Configure kubectl (MASTER) mkdir -p $HOME/.kube sudo cp /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config 🔹 Install Pod Network (Flannel Example) kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml 🔹 Join Worker Node to Cluster sudo kubeadm join MASTER_IP:6443 \ --token TOKEN_VALUE \ --discovery-token-ca-cert-hash sha256:HASH_VALUE 🔹 Verify Cluster kubectl get nodes 👍 If this video helped you, Like, Subscribe, and hit the bell icon for more hands-on Kubernetes & DevOps tutorials! 📚 Chapters 0:00 - 🚀 Intro: Kubernetes Cluster Setup 1:00 - ⚖️ kubeadm vs Minikube 2:26 - 📋 Hardware and Prerequisites 3:47 - 🏗️ Kubernetes Components Explained 5:06 - 🗺️ Cluster Installation Roadmap 6:47 - 💻 Virtual Machine Preparation 9:45 - 🏷️ Configure Hostnames and IPs 14:21 - 📡 Verify Network Connectivity 16:21 - 🛠️ OS Updates and Swap 20:55 - 🧩 Kernel Modules and Sysctl 25:22 - 🕒 Sync System Time 26:16 - 📦 Install Containerd Runtime 31:38 - ⚙️ Install Kubernetes Binaries 32:43 - 🏗️ Initialize Control Plane 34:05 - 🌐 Deploy Pod Networking 34:40 - 🤝 Join the Worker Node 35:25 - ✅ Verify Cluster Status #kubernetes #kubeadm #VirtualBox #DevOps #SysAdmin #TechOpsTutorials #KubernetesCluster #Containerd #LinuxTutorial #HandsOnKubernetes