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Xiao Liu Lab
Xiao Liu Lab
Dec 10, 2025 · Operations

Why Do Your Services Disappear After Reboot? Master systemd Auto‑Start and Chaos Testing

This guide reveals why critical services often fail to start after a server reboot, presents essential systemd unit file parameters, provides ready‑to‑copy configurations for Nginx, Java, and Flask, outlines a four‑step troubleshooting workflow, and introduces a lightweight chaos‑engineering playbook to verify auto‑start resilience.

Linux operationschaos engineeringservice auto-start
0 likes · 15 min read
Why Do Your Services Disappear After Reboot? Master systemd Auto‑Start and Chaos Testing
IT Xianyu
IT Xianyu
May 20, 2025 · Operations

Building a Three‑Server High‑Availability MySQL Cluster with HAProxy on Almalinux

This guide explains why three servers are needed for high availability, walks through hardware and software preparation, network configuration, MySQL master‑slave replication setup, HAProxy load‑balancing, and firewall/SELinux adjustments, providing complete command‑line examples for each step.

AlmaLinuxHAProxyLinux operations
0 likes · 8 min read
Building a Three‑Server High‑Availability MySQL Cluster with HAProxy on Almalinux
Raymond Ops
Raymond Ops
May 4, 2025 · Operations

How to Safely Clone an Ubuntu System Disk with dd: Step‑by‑Step Guide

This article provides a comprehensive, step‑by‑step guide on using the low‑level dd tool to back up and restore an Ubuntu system disk, covering prerequisites, preparation, command examples, optional compression, feasibility analysis, precautions, and a concise conclusion.

Linux operationsLiveUSBUbuntu
0 likes · 7 min read
How to Safely Clone an Ubuntu System Disk with dd: Step‑by‑Step Guide
OPPO Kernel Craftsman
OPPO Kernel Craftsman
Dec 18, 2020 · Fundamentals

Linux Kernel File Cache Mechanism: In-Depth Analysis of Read/Write Processes and Pre-reading Algorithm

The article thoroughly explains Linux kernel file cache, detailing how read() and write() operations traverse VFS to the block layer, the adaptive read‑ahead algorithm that pre‑loads sequential pages, the internal functions such as generic_file_buffered_read and ondemand_readahead, and outlines write handling and future topics on mmap and cache reclamation.

Kernel InternalsLinux operationsPre-reading Algorithm
0 likes · 19 min read
Linux Kernel File Cache Mechanism: In-Depth Analysis of Read/Write Processes and Pre-reading Algorithm
Open Source Linux
Open Source Linux
May 7, 2020 · Operations

Master‑Backup High Availability with Keepalived: Step‑by‑Step Guide

This tutorial walks you through configuring Keepalived for single‑instance master‑backup failover and dual‑instance dual‑master high‑availability setups, covering preparation, installation, configuration file edits, service startup, verification of virtual IP migration, and practical verification commands.

Linux operationsdual instancemaster backup
0 likes · 10 min read
Master‑Backup High Availability with Keepalived: Step‑by‑Step Guide
Efficient Ops
Efficient Ops
Mar 25, 2019 · Operations

How to Achieve Real-Time Data Sync with rsync, inotify, and sersync on CentOS

This step‑by‑step guide shows how to set up two CentOS 7 virtual machines, install and configure rsync, inotify‑tools, and sersync, and combine them with scripts and cron jobs to obtain reliable, real‑time file synchronization and automated backups across the network.

CentOSLinux operationsbackup automation
0 likes · 17 min read
How to Achieve Real-Time Data Sync with rsync, inotify, and sersync on CentOS
MaGe Linux Operations
MaGe Linux Operations
May 25, 2017 · Operations

What Does a Linux Operations Engineer Do and How Is the Career Outlook?

This article explains the role, typical responsibilities, work intensity, learning curve, and career prospects of Linux operations engineers, offering practical advice for beginners and senior professionals while highlighting why enterprises choose Linux/Unix and the key technical directions in the field.

Career DevelopmentIT OperationsLinux Administration
0 likes · 8 min read
What Does a Linux Operations Engineer Do and How Is the Career Outlook?
MaGe Linux Operations
MaGe Linux Operations
Nov 26, 2015 · Operations

Master Docker Image Management: List, Tag, Push, Save, and Delete

This guide walks through essential Docker image commands—listing, searching, pulling, tagging, pushing, saving, loading, and deleting images—while explaining the underlying UnionFS layer mechanism and offering practical code examples for effective container image management.

Container ManagementDockerLinux operations
0 likes · 6 min read
Master Docker Image Management: List, Tag, Push, Save, and Delete