Simplifying Kubernetes Cluster Setup with Kubeadm Installation Guide πŸš€

Simplifying Kubernetes Cluster Setup with Kubeadm Installation Guide πŸš€

πŸ“ Introduction:

In the world of container orchestration, Kubernetes has emerged as the de facto standard. It provides a powerful platform for managing containerized applications, but setting up a Kubernetes cluster can be a daunting task. That's where Kubeadm comes to the rescue. In this guide, we'll walk you through the process of setting up a Kubernetes cluster using Kubeadm on Ubuntu.

πŸ” Prerequisites βœ…

Before we dive into the installation process, let's make sure we have everything we need:

  • Ubuntu OS (Xenial or later): We'll use Ubuntu as our operating system.

  • sudo privileges: You need administrative access to the servers.

  • Internet access: To download necessary packages.

  • t2.medium instance type or higher: This guide assumes you have access to suitable hardware.

  • Both Master & Worker Node: For a fully functional cluster.

πŸ” Installation Steps πŸ› οΈ

  1. Update and Install Docker 🐳

    • Run the following commands on both the master and worker nodes to prepare them for Kubeadm:

        sudo su
        apt update -y
        apt install docker.io -y
        systemctl start docker
        systemctl enable docker
      

      Kubernetes relies on Docker containers, so it's essential to have Docker installed and running on all nodes.

  2. Add Kubernetes Repository and Install Kubeadm πŸ“¦

    • To add the Kubernetes repository and install Kubeadm, Kubectl, and Kubelet components, execute:

        curl -fsSL "https://packages.cloud.google.com/apt/doc/apt-key.gpg" | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/kubernetes-archive-keyring.gpg
        echo 'deb https://packages.cloud.google.com/apt kubernetes-xenial main' > /etc/apt/sources.list.d/kubernetes.list
      
        apt update -y
        apt install kubeadm=1.20.0-00 kubectl=1.20.0-00 kubelet=1.20.0-00 -y
      
  3. Initialize the Kubernetes Master Node πŸš€

    • Run this command to initialize the Kubernetes control plane on the master node:

        sudo su
        kubeadm init
      
  4. Set Up Local Kubeconfig πŸ“

    • To interact with the Kubernetes cluster from your local machine, create the Kubeconfig file:

        mkdir -p $HOME/.kube
        sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
        sudo chown $(id -u):$(id -g) $HOME/.kube/config
      
  5. Apply Weave Network Plugin 🌐

    • Use this command to apply the Weave network plugin, which ensures pod-to-pod communication:

        kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml
      
  6. Generate Token for Worker Nodes πŸ€–

    • Generate a token for worker nodes to join the cluster:

        kubeadm token create --print-join-command
      
  7. Expose Port 6443 for Worker Node Connectivity πŸ”—

    • Ensure that port 6443 is accessible from your worker nodes to the master node. This is essential for the worker nodes to communicate with the control plane.

πŸ” Worker Node Setup πŸ—οΈ

  1. Reset Kubeadm and Join Worker Node πŸ”„

    • On the worker node, execute the following commands:

        sudo su
        kubeadm reset pre-flight checks
      

      Then, paste the join command you obtained from the master node during token creation and append --v=5 for verbose output:

        kubeadm join <master-node-ip>:6443 --token <token> --discovery-token-ca-cert-hash <hash> --v=5
      
  2. Verification βœ”οΈ

    • On the master node, run:

        kubectl get nodes
      

      This should display both the master and worker nodes as part of your Kubernetes cluster.

πŸ” Optional Steps 🧐

  • Labeling Nodes 🏷️: If you want to label your worker nodes for specific roles, you can use the following command:

      kubectl label node <node-name> node-role.kubernetes.io/worker=worker
    
  • Testing a Demo Pod πŸš€: To verify your cluster's functionality, you can deploy a demo pod:

      kubectl run nginx --image=nginx --port=80
      kubectl expose pod nginx --port=80 --type=NodePort
    
  • Enable the port range 30000-32767 for the node-port on worker node

  • Now, type the below command to know the node-port for the pod

kubectl get svc

  • Node copy the public-ip of workernode: nodeport in the browser to get the nginx output

  • This will run a simple pod:

πŸ“Conclusion:

Congratulations! You've successfully set up a Kubernetes cluster using Kubeadm on Ubuntu. This provides you with a powerful platform for deploying and managing containerized applications in a scalable and efficient manner. πŸŽ‰

πŸ” Checkout GitHub Repository for projects:

πŸ”— github.com/sumanprasad007

πŸ” Check out my YouTube channel - Prasad Suman Mohan:

πŸ”— youtube.com/@sumanprasad007

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