System & Network Admin

With Signal, Whatsapp, and other centralized messengers suddenly running their servers in an authoritarian territory, we need a decentralized alternative. Delta Chat apps work with most e-mail servers but chatmail servers are more secure, faster and easy to setup, and have become the primary choice for new users. Learn how to host chatmail, and help creating the resilient chatmail server network for a shattered world!

Securely connect to anything on the internet with Tailscale. Built on WireGuard®️, Tailscale enables you to make finely configurable connections, secured end-to-end according to zero trust principles, between any resources on any infrastructure.

Docker uses two kinds of formats to represent running processes---images, and containers, and both store data on your computer's drive.

uBlock Origin Bonus Content. GitHub Gist: instantly share code, notes, and snippets.

An example cloud init configuration file for Debian 12 with Docker.

An awesome guide for the most useful CLI commands

👋 Welcome to the TSDProxy documentation! What is TSDProxy? TSDProxy is an application that automatically creates a proxy to virtual addresses in your Tailscale network. Easy to configure and deploy, based on Docker container labels or a simple proxy list file. It simplifies traffic redirection to services running inside Docker containers, without the need for a separate Tailscale container for each service. Note

Generate a basic authentication header from username and password with this Basic Authentication Header Generator.

If your homelab has more than a few servers or VMs running Debian-based distributions, it makes sense to set up a package caching proxy on one of your servers. This guide will show how to set that up, configure your other Linux hosts, and optionally how to use Ansible to automate configuring those other hosts.

Creating a local Cache of Ubuntu, Debian and Linux Mirrors.

A simple guide on how to route all the traffic from a TV streaming stick or similar device via a Tailscale Exit Node, making it appear as though it's originating from somewhere else.

The `du` command in Linux is a utility for analyzing and reporting disk usage of directories and files, offering various options to customize its output for effective storage management.

Cubic simplifies the creation of custom Linux distributions based on Ubuntu or Debian by providing a GUI and virtual terminal environment for customizing ISO images

One of the very few things that irritates me about TailScale is that it uses ULA addressing and doesn’t allow for custom address block definitions (i.e., I can’t use my own GUA block). While this is definitely a “me problem”, it is something that is irksome to me nonetheless. So, in order to get access to my systems over TailScale, over IPv6, I created this python script to grab the v6 addresses and put them into a format conducive to, say, an internal BIND view, or pihole (v5).

The Mathboard is a macropad that makes it easier to write equations on a computer. It is intended for engineers, scientists, and anyone else who regularly need to write equations. The Mathboard is …

If you spend a lot of time at the command line, you probably have either a very basic prompt or a complex, information-dense prompt. If you are in the former camp, or you just want to improve your …

How to create, activate, use, and delete a Python venv on Windows, Linux, and MacOS. We'll also look at how a Python venv works internally.

A deep dive into how managing my dotfiles has (not) evolved over the last 10 years.

My notes about open source stuff.

Master traffic redirection with our Caddy tutorial. Set up Caddy as a reverse proxy and quickly streamline access to your services.

In this guide, I'll walk through the process of setting up a Caddy reverse proxy using Docker and Docker Compose. Caddy is a powerful web server that comes with built-in support for automatic HTTPS, making it an excellent choice for hosting reverse proxies. Docker and Docker Compose provide a consistent

When a spam message gets past my shields and lands in my inbox, the first thing I do is look at the SpamAssassin headers to see if some rule fired whose priority I should bump up. Usually the answer is "Uggggghhhhhh no". It used to be that my second step was to add another phrase to the "body" rule (recent hits include "eligible for Verified Badge", "Qatari Investor", "Construction ...

Installing Python and related applications on a system without a network connection isn’t easy, but you can do it. Here’s how.

Systemd is a service manager for Linux; a drop-in replacement for the init process, and the systemctl command is the primary tool to manage systemd.

To prevent downtime, administrators can configure services to restart automatically whenever they fail, which is especially useful for web servers and databases

Warp has many features, including AI, whereas Ghostty is lightweight out of the box. Our guidance on which terminal app is best for you.