Tag: CentOS

The Community Enterprise Operating System or CentOS Linux, in short, closely mirrored until December of 2021, the Red Hat Enterprise Linux (RHEL) operating system (OS) while remaining independent from it as RHEL is a paid product and CentOS is free and open-source. These articles featured below deal with a variety of topics pertaining to CentOS and software/applications that run on CentOS. Happy reading!!

Configure a Firewall using UFW (Ubuntu) and Firewalld (RHEL)

Configure a firewall using UFW and Firewalld

Learn how to configure a Linux firewall using UFW on Ubuntu and Firewalld on RHEL. Step-by-step CLI examples, best practices, and comparison tables included. Table of Contents 🔈Introduction Securing your Linux server is a critical step in system administration. One of the foundational layers of server security is the firewall — a system that controls […]

How to Configure SSL for Splunk Enterprise on RHEL 9 | CentOS 9

Configure SSL for Splunk Enterprise on RHEL 9

Learn how to configure SSL for Splunk Enterprise on RHEL 9 or CentOS 9. This detailed guide covers certificate generation, secure web interface setup, and SSL forwarding configuration for maximum security. Table of Contents 🔈Introduction Securing your Splunk Enterprise deployment is crucial, especially when dealing with sensitive data and enterprise-level monitoring. One of the most […]

Install MongoDB on RHEL 10 | CentOS 10

Install MongoDB on RHEL 10 | CentOS 10

Learn how to install MongoDB (Community or Enterprise) on RHEL 10 / CentOS 10 with step‑by‑step repository setup, CLI commands, SELinux tips, and troubleshooting.” Table of Contents 🔈Introduction MongoDB is a leading NoSQL document database often used in production and development environments. If your organization is running RHEL 10  or CentOS 10, you may want to deploy […]

Fixing the Apache Error: Invalid Command ‘Header’

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

Enable Fail2Ban to block failed login attempts

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

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 Apache TLS configuration 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

Text Processing Tools in Linux: sed and awk

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

Enable Remi repository RHEL 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 RHEL 10 | CentOS 10

Install EPEL on RHEL 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 […]