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 đIntroduction When running a web server, nothing is more frustrating than Apache failing to start because of a cryptic configuration […]
Install XRDP on Ubuntu 24.04 for Remote Desktop Access
Learn how to install and configure XRDP on Ubuntu 24.04 LTS to enable secure remote desktop access from Windows, macOS, or Linux. Stepâbyâstep setup with firewall rules, troubleshooting tips and performance/security best practices. Table of Contents đIntroduction Remote desktop access to Linux machines is essential for administrators, remote workers, developers, or anyone needing GUI access […]
20 Commonly Used SPL Commands in Splunk (With Examples)
Explore 20 commonly used SPL commands in Splunk, with example queries for stats, timechart, eval, eventstats, streamstats, rex, and more. Boost your Splunk search skills and write better dashboards and alerts. Table of Contents đIntroduction If you’re learning Splunk or even if you’ve been using it a while, knowing the right SPL (Search Processing Language) […]
How to Safely Migrate from MySQL to PostgreSQL (Step-by-Step)
Learn how to safely migrate your MySQL database to PostgreSQL with this step-by-step guide. Get tips on tools, data migration, schema conversion, and performance optimization. Table of Contents đIntroduction Migrating from MySQL to PostgreSQL is an important yet sometimes tricky process. Whether you’re moving to PostgreSQL for better performance, richer features, or scalability, understanding the […]
Upgrade to PHP 8.4 on Ubuntu 22.04 | 24.04
Upgrade to PHPâŻ8.4 on UbuntuâŻ22.04 orâŻ24.04 with this complete, stepâbyâstep guide. Includes commands, configuration, Apache & Nginx setup, troubleshooting, and best practices to ensure a smooth migration. Table of Contents đIntroduction Modern PHP releases bring faster execution, new features, and better security. PHPâŻ8.4, though still developing in midâ2025, is increasingly adopted by developers. If you’re […]
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 đIntroduction In todayâs 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 đIntroduction In modern enterprise networks, Virtual LANs (VLANs) are essential for segmenting traffic, improving security, and optimizing performance. On Red Hat Enterprise […]
Upgrade Ubuntuâ22.04 to 24.04 in 5 Steps
Stepâbyâstep guide: how to safely upgrade UbuntuâŻ22.04 LTS (âJammyâ) to UbuntuâŻ24.04 LTS (âNobleâ) in 5 essential stepsâbackup, update, configure the upgrader, run the release upgrade, and verify cleanâup. Table of Contents đIntroduction Upgrading from Ubuntu 22.04 LTS (âJammy Jellyfishâ) to Ubuntu 24.04 LTS (âNoble Numbatâ) is a major step forward: newer kernel, updated toolchains, longâterm support until […]
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 đIntroduction 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 đ Introduction In the world of Linux commandâline text processing, two tools reign supreme: sed (stream editor) and awk (pattern scanning and processing language). These tools provide extraordinary flexibility for transforming, filtering, […]