A comprehensive guide to diagnosing and resolving server disk space alerts, covering root cause analysis, evidence-based cleanup procedures, automated safety-guarded scripts, and monitoring strategies for Linux systems with systemd and Docker.
A comprehensive practical guide covering grep, sed, and awk for log analysis, detailing real-world usage, performance pitfalls, GNU/BSD differences, production risks, and complete troubleshooting workflows with verified commands for CentOS, Ubuntu, and macOS environments.
Comprehensive guide covering Linux time concepts, NTP protocol, chrony vs ntpd, clock source selection, leap second handling, configuration templates for cloud, containers, Kubernetes, and isolated networks, plus verification, monitoring, troubleshooting, compliance automation, and rollback strategies.
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.
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.
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.
This guide explains how to effectively manage application logs on Linux by defining log content and archiving rules, handling special scenarios like nohup, MySQL, and Nginx, and using tools such as crontab, logrotate, and copy‑truncate to prevent uncontrolled disk growth.
With CentOS discontinued, this guide walks through the key considerations and step‑by‑step configurations for DNS, time synchronization, security baselines, SELinux, firewall, and kernel tuning on Ubuntu 22.04 and Anolis 8.6 as viable replacements.
This article shows how to use the Linux tail command together with a simple Java program to collect logs in real time, explains the difference between tail -f and tail -F, demonstrates file rotation handling, and offers practical tips for reliable log monitoring.
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.
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.
This guide presents four practical Bash scripts for production Linux servers, covering MySQL full backup with remote sync, Nginx process monitoring that triggers Keepalived failover, MySQL slave status alerts, and a comprehensive CentOS 7 system initialization routine.
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.
This guide walks through expanding an e‑commerce website from 1,000 QPS to 3,000 QPS by deploying an LVS load‑balancing cluster, covering NAT and DR modes, IPVS configuration, kernel tuning, persistent connections, and SSL termination with step‑by‑step commands and diagrams.
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.
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.
This guide explains what Unix domain sockets are, shows how to create a socket file, and provides step‑by‑step Nginx and PHP‑FPM configuration instructions for establishing inter‑process communication on a Linux server.
This guide explains how to detect DNS pollution on Ubuntu 12.04, disable the default NetworkManager dnsmasq cache, install and configure dnsmasq to route specific domain queries through OpenDNS on special ports, and verify that legitimate IP addresses are returned.
