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Kubernetes (K8s) is an open-source container orchestration platform used to automate the deployment, scaling, and management of containerized applications. Installing K8s requires tools to simplify and accelerate the process. This article explains how to install K8s using the most common tool, Kubeadm. K8s Installation Workflow The following is ...

Kubernetes Environment Planning Pod Network (podSubnet): 10.244.0.0/16 Service Network (serviceSubnet): 10.96.0.0/12 Lab Environment Specifications: Operating System: CentOS 7.5 Configuration: 2GB RAM / 4 vCPU / 50GB HDD Initializing the Kubernetes Cluster Environment First, set up the production environment server. Later, node environments can ...

Determine the type of upgrade: patch version (e.g., v1.12.0 → v1.12.7) or minor vertion (e.g., v1.12.7 → v1.13.0). Only upgrades between adjacent minor versions are supported. Configure Kubernetes Package Repositories If repositories are already configured, skip this step. Debian/Ubuntu apt-get update && apt-get install -y apt-transport ...

Configuring the Container RuntimeTo begin, configure the Docker daemon to utilize a registry mirror, which accelerates image downloads. Create the necessary configuration file:sudo mkdir -p /etc/docker sudo tee /etc/docker/daemon. <<-'EOF' { "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"] } EOFApply the changes by reloading t ...

A Kubernetes cluster requires atleast three CentOS 7 servers. One master node (hostname: master-k8s). Two worker nodes (hostnames: worker-k8s-01, worker-k8s-02). All steps in the Environment Preparation and Docker Installation sections must be executed on all three nodes: master-k8s, worker-k8s-01, and worker-k8s-02. Environment Preparation C ...

Prerequisites Before starting, ensure you're machines meet these requirements: One or more machines running CentOS 7.x (x86_64) Hardware: minimum 2GB RAM, 2 CPUs, 30GB disk space Network connectivity between all machines Internet access for pulling container images Swap disabled Objectives Install Docker and kubeadm on all nodes Initialize t ...

Setting Up a Kubernetes Cluster with kubeadm Infrastructure Overview We will create a Kubernetes cluster using Vagrant. The environment consists of three CentOS-based virtual machines: Hostname IP Address master1 192.168.33.11 node1 192.168.33.12 node2 192.168.33.13 Vagrantfile Configuration Below is the Vagrantfile used to define ...

Node Configuration Table Role IP Address master1 192.168.40.180 master2* 192.168.40.183 node1 192.168.40.181 node2* 192.168.40.182 *Nodes marked with an asterisk are reserved for future cluster expansion. Prerequisites for All Node Hostname Assignment hostnamectl set-hostname master1 && bash # Run on master1 hostnamect ...

This command displays the expiration and remaining validity time for all certificates, including client certificates in the /etc/kubernetes/pki directory and client certificates embedded in KUBECONFIG files (admin.conf, controller-manager.conf, scheduler.conf). ### Manual Certificate Renewal The kubeadm certs renew command allows manual certif ...

Installing the Container RuntimeDocker serves as the underlying container runtime for Kubernetes. Update the package index and install Docker using the following commands:sudo apt-get update sudo apt-get install -y docker.ioOnce installed, ensure the Docker service is running:sudo systemctl start docker sudo systemctl enable dockerDeploying Kub ...