Kubernetes Setup Kubeadm

In this lesson, we explore the kubeadm tool—a powerful utility that simplifies bootstrapping a Kubernetes cluster. Kubeadm automates essential tasks such as component installation, configuration file setup, and secure certificate generation, ensuring your multi-node cluster adheres to Kubernetes best practices.

Kubernetes clusters comprise several key components, including the kube-apiserver, etcd, and various controllers that collaborate to manage cluster operations.

High-Level Setup Steps

Follow these steps to create a Kubernetes cluster using kubeadm:

1. Provision Nodes: Set up multiple physical or virtual machines. These nodes will form your Kubernetes cluster.
2. Designate Roles: Identify one node as the master and assign the remaining nodes as workers.
3. Install Container Runtime: Deploy a container runtime on every node. In this tutorial, we use ContainerD.
4. Deploy Kubeadm: Install the kubeadm tool on all nodes. Kubeadm orchestrates the installation of the necessary Kubernetes components.
5. Initialize the Master Node: Run the initialization process on the master node. Kubeadm installs and configures all components required to control the cluster.
6. Set Up Networking: Before adding worker nodes, ensure your pod network prerequisites are satisfied. Kubernetes requires a dedicated pod network for inter-node communication beyond basic connectivity.
7. Join Worker Nodes: Add worker nodes to the cluster once the pod network is configured.
8. Deploy Applications: With your cluster up and running, you can now deploy and manage your applications seamlessly.