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Diagnostic Workflow: The Three Core Techniques When troubleshooting issues in a Kubernetes cluster—such as unresponsive nodes, crashing Pods, or network failures—it's essential to move beyond surface-level symptoms. A structured diagnostic approach significantly improves resolution speed and accuracy. The following three techniques form the fou ...

Common Pod Spec Fields spec.containers <[]object> spec.containers.name <string>: Container name, required and unique. Cannot be changed after creation. spec.containers.image <string>: Image path/name:tag. spec.containers.imagePullPolicy <string>: Image pull policy: Always, Never, IfNotPresent. Default is IfNotPresent, e ...

Modern enterprises increasingly require powerful search and analytics capabilities to handle growing data volumes. Easysearch emerges as an enterprise-grade search engine that enables organizations to build high-performance, scalable data retrieval systems. In today's cloud computing landscape, containerization has become the standard approach ...

CI/CD Workflow Overview Transitioning from traditional virtual machine-based CI/CD to a Kubernetes-native approach offers significant advantages in resource utilization and environment consistency. Traditional Workflow: CI: Developers push code to GitLab -> Jenkins triggers build on a static slave -> Code scanning and compilation -> A ...

Kubernetes relies on a decoupled, event-driven architecture to manage workload placement across cluster nodes. At the heart of this system lies the List-Watch mechanism, which enables components to react to state changes in real time without polling. This mechanism allows the API Server to notify components like the Scheduler, Controller Manage ...

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 ...