System & Network Admin

Follow along with this example of performing accessibility tests in GitLab with Pa11y and Cypress on a Jekyll website.

Comparing one of the most popular Postgres features against alternatives

This guide provides detailed instructions on how to generate a CSR code and install an SSL Certificate on the Postfix mail transfer agent…

Learn all about Pure Aloha in computer networks, from its protocol and collision avoidance mechanism to its advantages, disadvantages, and applications.

ExifTools is a very powerful-yet-easy-to-use application for reading, writing, and editing metadata of multimedia files in Linux systems.

A browser extension that mounts your browser tabs as a filesystem on your computer.

Cyclic Redundancy Check (CRC) ensures accurate data transmission in computer networks, including its basics, implementation, applications, strengths, and weaknesses.

Discover everything you need to know about High-Level Data Link Control (HDLC) in computer networking.

Binary Synchronous Communications Protocol (BISYNC) in computer networks - its architecture, operation, applications, advantages, and implementation.

This in-depth article explores the Point-to-Point Protocol (PPP) in computer networks, covering its features, functionality, and applications in WANs and ISPs.

Follow this guide to use Fail2ban on your Linux server to protect it by banning IP addresses that show signs of malicious activity.

This in-depth article explores the various types of network devices in computer networks, including routers, switches, modems, and more.

Learn about line configuration in computer networks with this detailed guide. Discover the types, pros and cons, and how to choose the best for your network.

This article provides a comprehensive overview of the various services offered by the data link layer in the OSI model of computer networks.

Many people, when they are installing a Linux distribution for a single purpose such as running containers, would prefer an install-and-forget type of deployment. At FOSDEM 2023 in Brussels, several projects of this minimal Linux distribution type were presented. Fedora CoreOS, Ubuntu Core, openSUSE MicroOS, and Bottlerocket OS all tackle this problem in their own way. The talks at FOSDEM gave an interesting overview of how these projects differ in their approaches.

Side note: Using a secondary network interface is recommended since the following commands could make a remote machine unreachable. This a blog post about the basics of netem and tc on how to modify

Automatically provisions and installs locally-trusted TLS certificates for Node.js https servers in 100% JavaScript (without any native dependencies like mkcert and certutil).

Understand the basics of IP Addressing, including IP classes, subnetting, default gateways, DNS, static & dynamic IP addresses and the evolution to IPv6.

Code a "guess the number" game in Expect. Then, learn the real power of Expect with a separate script to automate playing the game.

Forgetting the password to your important PDF documents can be disastrous. pdfcrack is a Linux command line tool that can crack the password of any PDF file

Learn how to use and install vault docker image to run in a local environment with docker compose. Hashicorp vault examples and tutorials.

In this tutorial, we'll compare Vaultwarden to Bitwarden and why you would consider using it instead of Bitwarden as well as everything you need to know to get Vaultwarden deployed quickly and easily in your homelab environment using Docker Compose.

If you run multiple services on your network - especially using Docker - hosting a Nginx reverse proxy is an invaluable tool for making accessing those services easier. With this guide, you'll have Nginx setup and configured in no time. While the bulk of the information regarding configuring Nginx will apply to any Nginx install, the scripts / instructions specific to installing the software will only work on Debian / Ubuntu.

Use the ACME protocol to get certificates from step-ca. ACME radically simplifies TLS and HTTPS by letting you obtain certificates automatically.