This article walks through expanding a Linux server’s root filesystem by checking disk usage, adding a new disk, creating a physical volume, extending the volume group and logical volume, and resizing the XFS filesystem, with commands and screenshots for each step.
An urgent 3 AM outage on an e‑commerce site triggered a CPU spike and massive latency, but by separating static and dynamic traffic with Nginx, adding smart caching and load‑balancing, the author restored stability, cut page load time by 75 % and dramatically reduced server load.
This comprehensive guide walks you through building a monitoring baseline, tuning CPU, memory, disk I/O, and network settings, applying kernel and application optimizations, and setting up automated monitoring and alerts to dramatically improve Linux production system performance.
This comprehensive guide explains what Nginx is, its advantages over Apache, default configuration paths, step‑by‑step YUM and source installation, service management via init.d and systemd, process architecture, and essential command‑line controls for starting, stopping, reloading, and upgrading the server.
This step‑by‑step guide shows how to upgrade the outdated OpenSSH 7.4p1 and OpenSSL 1.0.2k on a CentOS 7 server by first installing Telnet as a fallback, removing the old packages, installing OpenSSL 1.1.1g, compiling OpenSSH 8.3p1, adjusting the configuration, and finally testing the new SSH service.
After a mistaken rm -rf command wiped an entire production server, the author details the step‑by‑step recovery using ext3grep, extundelete, and MySQL binlogs, while sharing hard‑earned lessons on backup, permissions, and incident response.
This article introduces several MySQL performance‑tuning utilities—including mysqltuner.pl, tuning-primer.sh, and Percona Toolkit’s pt-variable-advisor and pt-query-digest—explaining how to download, run, and interpret their reports to optimize database configuration, memory usage, and query efficiency.
This guide explains how to locate large directories and files consuming disk space on Linux servers using commands like df, du, find, lsof, and tune2fs, and offers tips for handling hidden or deleted file usage.
This article provides a concise collection of frequently used Nginx configuration snippets—including listening ports, access logs, server names, static assets, redirects, reverse proxy, load balancing, and SSL settings—along with a brief introduction to an online visual configuration tool.
The article outlines a rapid, one‑minute health check for Linux servers using ten common command‑line tools—uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, sar, and top—to quickly reveal CPU, memory, I/O, network saturation and error conditions before deeper analysis.
This guide presents a comprehensive set of Bash and AWK one‑liners for analyzing web server logs, counting unique IPs, tracking page visits, sorting traffic by time, identifying heavy‑weight requests, monitoring Apache processes, and examining network connection states, helping you detect anomalies and optimize performance.
A concise reference of the most useful Linux shell commands—from file searching and process management to networking and file compression—explains syntax, common options, and practical examples to help developers interact efficiently with Linux servers.
The article explains how Red Hat's strategic move to replace CentOS Linux with the rolling‑release CentOS Stream has upset the community, outlines the background of RHEL, Fedora and CentOS, and introduces Rocky Linux as a community‑driven alternative for stable server deployments.
This guide walks you through essential Linux server configuration checks—retrieving OS version, kernel, CPU specs, memory usage, and disk information—using common command‑line tools, helping administrators quickly understand hardware and system details for effective deployment and maintenance.
This guide walks through verifying the existing Nginx 1.16.1 process, compiling and configuring Nginx 1.18.0 with identical options, performing a zero‑downtime binary replacement, and handling rollback procedures using signals and process management commands on a Linux server.
This comprehensive guide walks you through setting up Nginx on CentOS, explains its core features, shows how to configure basic and advanced settings, and demonstrates practical scenarios such as static file serving, browser caching, cross‑origin access, anti‑hotlinking, HTTP proxying, load balancing algorithms, and cache management.
This guide explains why Linux dominates modern IT, then walks through fourteen practical hardening measures—including physical security, updates, minimal installations, login restrictions, user and file management, firewall configuration, package handling, disabling Ctrl‑Alt‑Del, monitoring, log centralization, backups, security tools, and management policies—to build a robust and attack‑resistant Linux server.
This article shares hard‑earned operational guidelines for Linux servers, covering safe testing, cautious use of rm ‑rf, the importance of backups, strict access control, SSH hardening, firewall rules, intrusion detection, systematic monitoring, performance tuning, and maintaining a calm mindset to prevent costly incidents.
Learn how to install, configure, and maintain a private BIND DNS service on CentOS 7, covering server roles, ACLs, forward and reverse zones, zone files, firewall settings, testing with nslookup, and ongoing DNS record management for a secure internal network.
This guide explains seven practical SSH techniques—including basic login, custom ports, compression, debugging, source address binding, remote command execution, and mounting remote filesystems—providing clear examples and command syntax for secure and efficient Linux server administration.
This guide provides step‑by‑step instructions for securing Redis with a password, recovering MySQL master‑slave replication, redirecting HTTP to HTTPS in Nginx, defending Linux servers against attacks, configuring Zabbix monitoring for MySQL, and various Nginx and MySQL configuration tricks.
In this detailed account of a 2018 Linux operations interview, the author shares the job description, required skills, practical preparation tips, and concise answers to seven common interview questions, offering valuable insights for aspiring sysadmin and DevOps professionals.
This guide walks you through checking NTP status, viewing peers, manually syncing time, starting and enabling the NTP daemon at boot, verifying auto‑start, and customizing NTP servers to keep clocks consistent across many web servers.
This guide explains why a GitLab instance may display an unexpected SSH clone URL, how to locate the misconfigured ssh_port setting, and provides step‑by‑step instructions to adjust the SSH daemon port, update GitLab’s configuration, and restart services to resolve the issue.
