Focused on sharing DevOps, Kubernetes, Linux, Docker, Istio, microservices, Spring Cloud, Python, Go, databases, Nginx, Tomcat, cloud computing, and related technologies.
This guide explains why a production Redis cluster may show intermittent timeouts and READONLY errors, analyzes root causes such as network jitter, resource saturation, and costly commands, and provides step‑by‑step troubleshooting and configuration fixes to restore stability and performance.
This guide lists several free Docker registry mirror URLs, shows how to add them to the daemon.json file, and explains the steps to restart Docker so that image pulls are faster and more reliable.
This guide presents twenty common production‑environment problems—from log analysis and database recovery to Kubernetes scheduling—detailing real‑world scenarios, step‑by‑step command solutions, and preventive measures that help engineers quickly diagnose, resolve, and avoid outages.
This article introduces gping, a Rust‑based network diagnostic tool that extends the classic ping command with real‑time ASCII graphing, multi‑host support, customizable colors, and cross‑platform compatibility, and provides step‑by‑step installation and usage examples on Linux.
This guide explains how to optimize Kubernetes API Server performance by configuring the max-mutating-requests-inflight limit and watch-cache-size, offering recommended values for different cluster sizes, monitoring metrics, and step‑by‑step adjustment strategies for stable, high‑throughput clusters.
This guide compiles the 20 most common Linux and Kubernetes troubleshooting commands, illustrating typical outputs and step‑by‑step diagnostic reasoning for high CPU load, disk pressure, network failures, pod crashes, node issues, service outages, database errors, and application performance problems.
In a Kubernetes cluster the kube-scheduler pod may stay pending due to a container-name reservation conflict; this guide shows how to locate the offending container with ctr, delete it, restart kubelet, and verify that the pod returns to Running state.
This guide explains Dockerfile fundamentals, enumerates all major instructions, and provides step‑by‑step examples for creating minimal Apache (httpd) images on both RockyLinux and Alpine using Podman, including building, testing, tagging, and pushing to Docker Hub.
This article explains how K3s's new embedded container image feature lets Kubernetes nodes share OCI images peer‑to‑peer, eliminating external registry dependence and speeding up distribution in offline, low‑bandwidth, or geographically dispersed environments.
When Kubernetes certificates expire, the cluster becomes unusable; this guide explains how to check certificate expiration, renew the affected certificates with kubeadm, verify the updates, and restart control‑plane components to bring the cluster back online, including HA considerations.
