Author

Xiao Liu Lab

An operations lab passionate about server tinkering 🔬 Sharing automation scripts, high-availability architecture, alert optimization, and incident reviews. Using technology to reduce overtime and experience to avoid major pitfalls. Follow me for easier, more reliable operations!

Articles

Likes

549

Views

Comments

Latest from Xiao Liu Lab

83 recent articles

Xiao Liu Lab

Jun 11, 2026 · Operations

Ops Engineer Core Skills: From Basic Commands to High‑Availability Architecture

This article provides a comprehensive roadmap for operations engineers, covering essential Linux commands, core system concepts, service principles, fault‑diagnosis methods, high‑availability architecture designs, data security, backup strategies, performance tuning, and automation scripts to handle both single‑machine and large‑scale cluster environments.

DockerHigh AvailabilityKubernetes

0 likes · 13 min read

Ops Engineer Core Skills: From Basic Commands to High‑Availability Architecture

Xiao Liu Lab

Feb 12, 2026 · Information Security

When fail2ban Became a Monero Miner: Detection, Removal, and Prevention

A temporary test server on Tianyi Cloud was compromised by a malicious XMRig miner masquerading as fail2ban, causing CPU usage to skyrocket; the article details how the intrusion was discovered, the forensic steps taken, and a comprehensive remediation and hardening guide to prevent similar attacks.

CPU SpikeFail2banLinux security

0 likes · 9 min read

When fail2ban Became a Monero Miner: Detection, Removal, and Prevention

Xiao Liu Lab

Feb 10, 2026 · Operations

Unlocking Modern CDN: From Simple Caching to Edge Computing, Dynamic Acceleration, and Security

This article explains how CDN has evolved from basic static‑content caching to a full‑featured edge computing platform that boosts user experience, accelerates dynamic APIs, implements fine‑grained cache strategies, and enforces multi‑layer security, providing concrete configuration examples and performance metrics for real‑world deployments.

CDNCache Strategycloud services

0 likes · 17 min read

Unlocking Modern CDN: From Simple Caching to Edge Computing, Dynamic Acceleration, and Security

Xiao Liu Lab

Jan 23, 2026 · Operations

How to Build Enterprise‑Ready Docker Images in 5 Minutes

This guide walks you through the four essential principles for production Docker images, demonstrates a complete multi‑stage Dockerfile for a Flask app, shows how to tag, build, verify, and deploy with docker‑compose, and warns against unsafe shortcuts like docker commit.

DockerFlaskImage Building

0 likes · 11 min read

How to Build Enterprise‑Ready Docker Images in 5 Minutes

Xiao Liu Lab

Jan 17, 2026 · Operations

Recover Accidentally Deleted XFS Files in Minutes with xfs_undelete

This guide walks Linux administrators through why xfs_undelete is the preferred XFS recovery tool, how to install it in under five minutes, and step‑by‑step commands—including basic, time‑filtered, and type‑filtered recovery—plus three real‑world scenarios, advanced tips, and common pitfalls.

Data RecoveryFilesystemXFS

0 likes · 13 min read

Recover Accidentally Deleted XFS Files in Minutes with xfs_undelete

Xiao Liu Lab

Jan 16, 2026 · Operations

Recover Accidentally Deleted Files on RHEL with extundelete – Full Step‑by‑Step Guide

This guide explains why extundelete can restore files deleted with rm on ext3/ext4 partitions, walks through installing the tool on various RHEL versions, shows how to safely stop writes, identify the affected partition, execute single‑file, directory or full‑partition recovery commands, verify results, and avoid common pitfalls, while also offering preventive measures to reduce future data loss.

File RecoveryRHELdata loss prevention

0 likes · 19 min read

Recover Accidentally Deleted Files on RHEL with extundelete – Full Step‑by‑Step Guide

Xiao Liu Lab

Jan 8, 2026 · Operations

Unlock Fast Log Analysis: 10 Essential awk Commands Every Sysadmin Should Know

This tutorial shows how awk, the built‑in Linux text‑processing tool, can dramatically speed up log analysis and routine data extraction by explaining core concepts, common patterns, real‑world examples such as Nginx, system monitoring and MySQL slow‑query logs, and providing a ready‑to‑run script.

Shell scriptingawklinux

0 likes · 17 min read

Unlock Fast Log Analysis: 10 Essential awk Commands Every Sysadmin Should Know

Xiao Liu Lab

Jan 7, 2026 · Operations

Zero‑IO Techniques to Safely Clear Massive Log Files on Linux

This article explains why deleting huge log files can crash a server, compares the low‑IO echo and truncate commands for safely emptying logs, provides practical examples, parameter tips, additional methods, and best‑practice recommendations for production environments.

IO optimizationTRUNCATEecho

0 likes · 10 min read

Zero‑IO Techniques to Safely Clear Massive Log Files on Linux

Xiao Liu Lab

Jan 6, 2026 · Operations

Boost Docker Pull Speed: Verified Mirror List & One‑Click Setup (2026)

This guide explains why Docker image pulls can be painfully slow, presents a curated list of reliable mirror URLs verified on January 6 2026, provides a one‑click installation script for Docker with automatic mirror configuration, and includes detailed manual setup steps and verification commands for Linux environments.

Container RegistryDockerImage Mirror

0 likes · 8 min read

Boost Docker Pull Speed: Verified Mirror List & One‑Click Setup (2026)

Xiao Liu Lab

Jan 3, 2026 · Operations

How to Quickly Identify Unexpected Linux Server Reboots and Their Causes

This guide shows Linux administrators step‑by‑step how to locate reboot timestamps, retrieve full reboot histories, examine log files, analyze kernel and crash logs, check service and resource issues, and investigate human or scheduled actions, enabling fast root‑cause diagnosis of unplanned server restarts.

RebootServerlogs

0 likes · 9 min read

How to Quickly Identify Unexpected Linux Server Reboots and Their Causes