System & Network Admin

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.

Install an SSL Certificate on NGINX to ensure a safe connection from your webserver to browsers. Set up SSL on NGINX with these simple steps.

OpenSearch is a community-driven, Apache 2.0-licensed open source search and analytics suite that makes it easy to ingest, search, visualize, and analyze data.

OpenSearch is a community-driven project by Amazon and a fork of Elasticsearch and Kibana. In this tutorial, you will install and set up OpenSearch - ...

What is a rogue DHCP server A rogue DHCP server is an unauthorized DHCP server that distributes knowingly or unknowingly wrong or malicious information to clients that send DHCP discover packets withi

In this article, we will explore the /etc/mtab file on a Linux system and understand the various parameters and directives included therein.

Instead of using CI/CD pipelines or Terraform Cloud, try this alternative approach to automating Terraform using Flux and GitOps.

In most cases, video editing software in Linux is free. If you want to try it, these are some of the best Linux video editors.

Screen is a terminal multiplexer and has a wide feature set. It allows you to split your terminal window into multiple windows (split screen feature), detach sessions to let commands run in the backgr

Explains how to set up ssh keys with YubiKey as two-factor authentication (2FA) to protect ssh keys stored on local Linux/macOS/BSD system.

In this article, you will learn what file globbing is in Linux and how to use it with various commands through practical examples.

Power over Ethernet - or short 'PoE' - allows you to supply DC power for another device over the ethernet network cable. The most common Power Source Equipment (PSE) types are switches and routers (en