Linux Admin Archives - ITFROMZERO

Installing OpenLiteSpeed on CentOS Stream 9: The Ultimate ‘Weapon’ for WordPress

By IT From Zero July 26, 2026

Boost your website performance with OpenLiteSpeed on CentOS Stream 9. A step-by-step guide to installation, PHP 8.3 configuration, and LSCache optimization to minimize TTFB.

Centos

Mastering nftables on CentOS Stream 9: Replacing iptables for Optimized Firewall Performance

By IT From Zero July 26, 2026

Say goodbye to iptables; nftables is the new standard on CentOS Stream 9. Learn how to optimize your firewall using Sets and Verdict Maps for better system performance.

Ubuntu

Building Your Own Mail Server with Postfix and Dovecot on Ubuntu 22.04: Take Full Control of Your Mail Flow

By IT From Zero July 25, 2026

Set up a professional Mail Server with Dovecot and Postfix on Ubuntu 22.04. Detailed guide on configuring IMAP/POP3, SSL security, and tips to avoid spam filters.

Centos

Mastering DNF Priorities on CentOS Stream 9 to Tame Repository Chaos

By IT From Zero June 18, 2026

Configuring DNF Priorities on CentOS Stream 9 is the best way to manage repository precedence, protect system packages, and avoid conflicts from third-party sources.

Security

Building an Incident Response Process for Linux Servers: Investigation, Containment, and Recovery After an Attack

By IT From Zero June 13, 2026

A practical guide to building a Linux Server Incident Response process using the PICERL model: from confirming an incident and emergency network isolation, to collecting evidence, eradication, and safely restoring the system. Includes real commands drawn from hands-on production incident experience.

Linux

Practical Bash Scripting: Automating Linux from Scratch

By IT From Zero June 7, 2026

Learn how to write professional Bash Scripts to automate Linux. Detailed guide on variables, loops, functions, and practical error-handling techniques like set -euo pipefail.

Network

Port Knocking: How to Hide SSH Ports and Make Your Linux Server Invisible to Botnets

By IT From Zero April 18, 2026

Port Knocking is a security technique that completely hides SSH ports from port scanners. Learn how to install knockd on Linux to protect your server from brute-force attacks.

Centos

CentOS Stream 9: Saying Goodbye to network-scripts—The “Right” Way to Configure Static IPs with nmcli

By IT From Zero April 14, 2026

Forget the legacy way of editing network-scripts on CentOS 9. This guide shows you how to use nmcli for fast, precise static IP configuration with no risk of losing connectivity after a reboot.