Fixing the Apache Error: Invalid Command ‘Header’
Learn how to fix the Apache error “Invalid command ‘Header’” when configuring a web server. Step-by-step guide with CLI commands, configuration examples, and troubleshooting tips to get your Apache server running smoothly. Table of Contents 🔈Introduction When running a web server, nothing is more frustrating than Apache failing to start because of a cryptic configuration […]
How to Enable Fail2Ban to Block Repeated Failed Login Attempts on Linux
Learn how to configure Fail2Ban to block repeated failed login attempts on Linux. Step-by-step guide with commands, configuration examples, and security tips for SSH and other services. Table of Contents 🔈Introduction In today’s threat landscape, brute-force attacks are a common way attackers attempt to gain unauthorized access to Linux servers. A simple and effective defense […]
Set Up VLANs Using NMCLI on RHEL 9
Learn how to set up VLANs using nmcli on RHEL 9 with this step-by-step guide. Includes CLI examples, troubleshooting tips, and best practices for configuring VLAN interfaces in a Linux environment. Table of Contents 🔈Introduction In modern enterprise networks, Virtual LANs (VLANs) are essential for segmenting traffic, improving security, and optimizing performance. On Red Hat Enterprise […]
How to Configure Secure TLS Settings in Apache on RHEL 9 | CentOS Stream 9
Secure your Apache web server on RHEL 9 or CentOS Stream 9 with a hardened TLS configuration. Learn how to enable TLS 1.2/1.3, enforce strong ciphers, configure HSTS, and test your setup. Table of Contents 🔈Introduction Transport Layer Security (TLS) is the backbone of modern web encryption, ensuring data transmitted between clients and servers remains […]
Text Processing Tools in Linux: sed and awk Explained
Master Linux text processing: learn how to use sed for quick edits and awk for powerful field-based reports, with examples, tips, and command pipelines. Table of Contents 🚀 Introduction In the world of Linux command‑line text processing, two tools reign supreme: sed (stream editor) and awk (pattern scanning and processing language). These tools provide extraordinary flexibility for transforming, filtering, […]
Enable and Use Remi Repository on RHEL 10 | CentOS 10
Learn to enable and use the Remi repository on RHEL 10 / CentOS 10 for installing modern PHP, MariaDB, and LAMP‑stack components safely and selectively. Table of Contents 🔈Introduction The Remi repository offers up-to-date versions of popular server-side software—such as PHP, MySQL, and MariaDB—not typically included in the default Enterprise Linux distributions. Combining Remi with EPEL and […]
Install EPEL on RHELÂ 10Â |Â CentOSÂ 10
Learn how to install and enable the EPEL repository on RHEL 10 or CentOS 10 step-by-step, with CLI commands, troubleshooting tips, and best practices. Table of Contents 🔈Introduction Installing the Extra Packages for Enterprise Linux (EPEL) repository on RHEL 10 or CentOS 10 unlocks a vast collection of high-quality, community-maintained open-source packages that are not included in the default repositories. Whether you’re managing a server […]
Understanding Regular Expressions: A Beginner’s Guide
Learn the basics of Regular Expressions with this beginner’s guide. Discover how to use regex for text searching, validation, and data extraction in Linux, programming, and more. Table of Contents 🔈Introduction Regular Expressions (regex) are an essential tool for anyone working with text processing or data extraction in Linux, programming, or even everyday tasks. While […]
How to Use grep for Advanced Search in Linux: A Comprehensive Guide
Learn advanced grep techniques to search files efficiently in Linux. Discover how to use regular expressions, case-insensitive searches, recursion, and more with practical examples. Table of Contents 🔈Introduction In the world of Linux, grep is an indispensable tool for searching through files and data streams. Whether you’re a system administrator, developer, or data scientist, understanding […]
How to Set Up a Syslog Server on RHEL 9 and CentOS 9
Learn how to set up a Syslog server on RHEL 9 and CentOS 9. Follow this step-by-step guide to collect, store, and manage log data from multiple devices in your network. Table of Contents 🔈Introduction Setting up a Syslog server on RHEL 9 and CentOS 9 is a critical step for system administrators and security […]