Author name: Sean

How to Compile a Dynamic NGINX Module: A Step-by-Step Guide

NGINX is a versatile, high-performance web server, often used for reverse proxying, load balancing, and other web-related tasks. One of its strengths is the extensibility provided through modules. While there are many built-in modules, you can also compile your own dynamic modules to extend its functionality. In this tutorial, we will guide you through the […]

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How to Create a cgroup on CentOS 7

Introduction Control Groups (cgroups) are a Linux kernel feature that allows you to allocate resources—such as CPU time, memory, and I/O bandwidth—among user-defined groups of processes running on a system. This guide will walk you through setting up and using cgroups on CentOS 7, giving you fine-grained control over resource allocation. Prerequisites Installing the Required

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The Pros and Cons of Blocking Requests with Empty User-Agent Headers Using ModSecurity

Introduction ModSecurity is an open-source web application firewall (WAF) that is highly configurable and customizable. It offers an array of rules and filters to help secure your web application. One common rule used is blocking requests that come with an empty User-Agent header. While this might seem like a good idea at first glance, there

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Navigating Network Security: Understanding Different Traffic Scrubbing Methods

Introduction Network security is a high-stakes game where the goal is to keep bad actors at bay while maintaining optimum performance. One essential tool for achieving this goal is traffic scrubbing, a method that filters out malicious or unnecessary data from your network traffic. With cyber threats such as Distributed Denial of Service (DDoS) attacks

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Understanding Service Config Files in Nginx and Apache on Ubuntu: Demystifying the ‘sites-enabled’ Directory

When it comes to web server software, two of the most popular choices are Nginx and Apache. These web servers power a large portion of the internet and are commonly deployed on Ubuntu servers. While the software itself is well-documented, one area that often puzzles newcomers is the configuration file structure—specifically, the use of directories

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The Unsung Hero of Rack Mounting: Understanding the Importance of Rack Nuts

When it comes to setting up a server rack or AV rack, most of the focus naturally goes to the big-ticket items—the servers, switches, routers, or audio-visual equipment. But, just like in any well-oiled machine, it’s often the smallest components that make the biggest difference in function and reliability. Enter rack nuts. In the world

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Types of Data Units

The concept of “data units” is foundational to understanding how data storage works. Below are some of the key types of data units, often referred to as “data storage units”: Why Disk Drive Manufacturers Use 1000 Instead of 1024 The discrepancy between using 1000 bytes and 1024 bytes to define units like KB, MB, GB,

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3 Effective Ways to Improve Cable Management in a Datacenter

Datacenters are the heart and brains of our modern interconnected world. As information becomes increasingly digitized, datacenters continue to grow in both size and complexity. One of the biggest challenges administrators face when setting up or maintaining a datacenter is cable management. Proper cable management is vital not just for aesthetics but also for airflow,

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5 Critical CLI Commands for Troubleshooting and Administering an LDAP/FreeIPA Server on Linux

Lightweight Directory Access Protocol (LDAP) is an open, vendor-neutral application protocol for accessing and maintaining distributed directory information services. FreeIPA (Identity, Policy, and Audit) provides an integrated security information management solution built on top of the LDAP server. Both are crucial in managing and accessing information on Linux-based systems, especially in enterprise environments. If you

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