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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 ...

Chart Structure and Configuration A Helm chart is a collection of files that describe a related set of Kubernetes resources. The core components include Chart.yaml, values.yaml, and template files under the templates/ directory. Chart.yaml This file defines metadata about the chart: apiVersion: v1 name: k8sapp version: 0.1.1 appVersion: "1 ...

Infrastructure Architecture Operating System Kernel IP Address Hostname Role Ubuntu 22.04 LTS 5.15.0 10.0.50.11 control-plane-1 Control Plane Ubuntu 22.04 LTS 5.15.0 10.0.50.12 control-plane-2 Control Plane Ubuntu 22.04 LTS 5.15.0 10.0.50.13 control-plane-3 Control Plane Ubuntu 22.04 LTS 5.15.0 10.0.50.21 worker-1 Worker Ubuntu 2 ...

Kompose is a CLI utility that translates docker-compose.yml files into native Kubernetes objects such as Deployments, Services, and PVCs. It eliminates the manual work of rewriitng Compose declarations into YAML manifests. Installation # Linux curl -L https://github.com/kubernetes/kompose/releases/latest/download/kompose-linux-amd64 -o kompose ...

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 ...

When deploying Istio on manually provisioned Kubernetes clusters, control plane components frequently fail to initialize due to DNS resolution timeouts and webhook connectivity issues. These problems typically stem from control plane nodes being unable to reach CoreDNS or cluster services from host network contexts. Prerequisites: DNS and Contr ...

The ListWatcher component provides core functionality for the Reflector pattern in Kubernetes controllers. This mechenism enables efficient resource synchronization by combining initial list operations with subsequent watch events. Constructing ListWatcher Instances ListWatcher objects are created using factory functions that configure their li ...

Kubectl Deploymant Workflow The process for deploying applications using Kubectl involves several key steps: Verify cluster readiness (Minikube or kubeadm) Create Deployment configuration Apply the configuration Verify deployment status Deploying a Sample Web Application 1. Creating the Deployment Configuration A Deployment object manages app ...

Implementing Istio Architecture Components Introduction Istio consists of two main parts: the data plane and the control plane. The data plane handles traffic management, while the control plane manages configuration and policy. This article guides you through implementing Istio's architecture components, helping beginners understand the entire ...

Store the cluster CA materials in a working directory: mkdir -p /root/pki/ cp /opt/kubernetes/ssl/ca-key.pem /root/pki/ cp /opt/kubernetes/ssl/ca.pem /root/pki/ cp /root/k8s/cert/k8s/ca-config.json /root/pki/ The ca-config.json profile defines permitted key usages and an expiration window: { "signing": { "default&quo ...