Focused on sharing DevOps, Kubernetes, Linux, Docker, Istio, microservices, Spring Cloud, Python, Go, databases, Nginx, Tomcat, cloud computing, and related technologies.
This article explains how containers communicate within a pod, between pods, and with services in Kubernetes, and compares Calico's IPIP and BGP networking modes, detailing their traffic handling, suitable scenarios, efficiency, and configuration steps.
This guide explains how to simulate and maintain two separate Kubernetes clusters on a single node by configuring kubeconfig files, adding clusters, users, and contexts, and switching between them to improve DevOps workflow efficiency.
This guide explains the concept of gray (canary) releases and provides detailed Istio configuration files—including Deployments, Service, Gateway, VirtualService, and DestinationRule—to gradually shift traffic between version 1 and version 2 of a service.
This guide explains why default Jenkins slave pods often suffer from slow builds or memory shortages, and provides concrete steps—adjusting CPU/memory limits, trimming plugins, using private artifact stores, disabling workspace cleanup, and configuring parallel stages—to dramatically improve Jenkins performance on Kubernetes.
A Kubernetes‑deployed business app sees its QPS drop from over 100k with a NodePort service to about 50k when exposed via Ingress, but adjusting Nginx keep‑alive parameters in the ingress‑controller can restore and even exceed the original performance while also enabling high availability.
This guide shows how to use Ingress‑Nginx annotations to perform canary releases in Kubernetes, covering header‑based, cookie‑based, and weight‑based traffic splitting with complete YAML manifests and curl commands for verification, providing step‑by‑step examples and demonstrating practical testing.
This article explains the concept of canary releases, outlines their advantages and drawbacks, and provides a detailed, command‑line tutorial for performing a canary deployment, monitoring, pausing, resuming, and rolling back a Kubernetes application using kubectl.
This guide explains the blue‑green deployment concept, outlines its pros and cons, and provides a step‑by‑step Kubernetes tutorial—including image loading, namespace creation, deployment manifests, service configuration, and traffic switching—to achieve zero‑downtime releases.
This guide explains what Kubernetes ephemeral containers are, why they’re useful for debugging, how to enable the feature gate, and provides step‑by‑step commands to create, attach to, and manage temporary containers within a pod.
This guide explains the fundamentals of Kubernetes ReplicaSet and Deployment controllers, their specifications, how to write YAML manifests, and provides step‑by‑step command‑line examples for creating, scaling, updating, and rolling back applications in a cluster.
