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This guide walks through a real incident where a Linux server was hijacked by a mining virus, detailing step‑by‑step emergency response, systematic forensic investigation, cleanup procedures, and hardening measures to prevent future breaches, complete with scripts and best‑practice recommendations.
This guide explains the shortcomings of Jenkins, outlines the core GitOps principles, details the selection of Tekton, ArgoCD, Harbor, and Kyverno, and provides step‑by‑step configurations, pipelines, and best‑practice recommendations for a production‑grade migration to a cloud‑native CI/CD platform.
This guide explains why accurate time synchronization is critical for distributed infrastructures, introduces Chrony as a modern NTP replacement, and provides step‑by‑step preparation, configuration, deployment, monitoring, and troubleshooting procedures—including real‑world case studies and best‑practice recommendations.
This guide walks through a real‑world Ceph cluster expansion from 500 TB to 1.2 PB, explaining the risks of automatic rebalancing, presenting a step‑by‑step, batch‑wise expansion plan with weight‑adjustment tricks, configuration tuning, monitoring, troubleshooting, and rollback procedures to keep business latency under control.
This guide explains why Docker image size matters for deployment speed, storage cost, and security, and walks through seven practical techniques—including multi‑stage builds, Alpine and Distroless bases, layer merging, dependency trimming, static compilation, and automated tools—to reduce a 1GB+ image to under 50 MB while preserving functionality.
This guide walks you through a full disaster‑recovery workflow for MySQL, covering emergency read‑only switching, pinpointing the deletion time via binlog, preparing a recovery instance, restoring the latest full backup with Xtrabackup or mysqldump, applying incremental binlog changes, verifying data integrity, and safely switching traffic back to the restored database.
This article examines why MySQL queries can become sluggish by analyzing seven typical situations where indexes become ineffective, provides step‑by‑step testing procedures, performance comparisons, troubleshooting tips, and best‑practice recommendations to restore optimal query performance.
This guide walks you through diagnosing intermittent TCP packet loss and latency spikes on Linux servers, from initial symptom checks and anti‑pattern warnings to detailed sender‑side, network‑link, and receiver‑side investigations using tcpdump, netstat, ss, and kernel tuning, complete with scripts, best‑practice tables and FAQ.
This article outlines the eight critical competencies—from Linux and scripting to cloud, container orchestration, and automation—that define the career progression of an operations professional and explains why mastering them is key to advancing to senior roles.
This article compiles 100 common operations interview questions covering DevOps principles, CI/CD, infrastructure as code, monitoring, automation, containerization, Kubernetes, Linux system administration, security, and shell scripting, providing a comprehensive study guide for candidates aiming for roles at major tech firms.
