Installing kubeadm

1. Introduction

kubeadm is a tool that helps you bootstrap a Kubernetes cluster. It is designed to be a simple way to create and manage a Kubernetes cluster. In this lesson, we will go through the process of installing kubeadm.

2. Prerequisites

Before installing kubeadm, ensure you meet the following prerequisites:

• Linux operating system (Ubuntu, CentOS, etc.)
• Root or sudo access
• Network connectivity to the internet
• Container runtime installed (Docker, containerd, etc.)

3. Installation Steps

3.1. Update the system

sudo apt-get update
sudo apt-get upgrade -y
            

3.2. Install dependencies

sudo apt-get install -y apt-transport-https ca-certificates curl
            

3.3. Add the Kubernetes APT repository

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
            

3.4. Install kubeadm, kubelet, and kubectl

sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
            

4. Verification

To verify that kubeadm has been successfully installed, run:

kubeadm version
            

5. Best Practices

• Always keep kubeadm, kubelet, and kubectl updated to the latest stable versions.
• Use a supported version of the operating system for better compatibility.
• Ensure that your firewall settings allow for Kubernetes networking.
• Regularly back up your cluster's configuration and state.

6. FAQ