System & Network Admin

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.

You can argue if bash is a good programming language or not, but you can’t argue that it is a programming language. However, there are a few oddities about it that make it different from most…

Generate random words, nouns, verbs, adjectives, letters, phrases, sentences or numbers to brainstorm and create new ideas at Random Word Generator.

Configure a Wireguard VPN tunneling IPv6 traffic on Linux by setting up an NDP proxy with Shorewall.

A routing protocol suitable both for wireless mesh networks and ordinary wired networks.

Learn to configure a secure, private mesh VPN using WireGuard®. Ideal for connecting multiple servers in a network without a central server.

What is CRXN? How does CRXN work? What are the goals of CRXN? Where can I find more information?

Instructions with example how to use WireGuard for a peer-to-peer connection. Preshared keys (PSK), wg-quick, integration in Systemd, key generation as well as dynamic and non-reachable peers are covered.

Example with explanations how to configure babeld.

In recent years, mesh networking has become a popular method of creating decentralized communication systems, […]

WireGuard is an advanced and modern VPN protocol with powerful cryptography. It is a simple, fast...

Explaining my home lab setup

Explains Linux and Unix bash/ksh shell scripting technique to convert uppercase to lowercase, including text files or variables.

I need to install the NerdFonts since I have been installing LazyVim recently. After doing some research, I found that the convenient way…

The tee command reads from standard input and writes to both standard output and one or more files at the same time. Tee is most commonly used in combination with other commands through piping.

Learn how to generate random numbers in a Linux environment.

Explore HashiCorp product documentation, tutorials, and examples.

I am writing a bash script which generates unattended GPG keys, I have looked through Unattended Usage of GPG and was surprised to find that 'Currently only one subkey can be handled.' I am unable...

Unattended GPG key generation (Using the GNU Privacy Guard)

SKILL LEVEL:  Advanced. In this article, we will be implementing one approach to centralize PGP key issuing and distribution for an organization.  We'll use an existing Linux instance's GnuPG tool to issue and manage keys.  To distribute keys to users, we'll use the 1Password CLI.   Let's dive in! The Infrastructure

To generate PGP keys on a Linux distribution we require the latest version of GPG (GnuPG). This is a free implementation of the OpenPGP standard which enables local key generation, encryption, and signing operations.

I am getting the following error running make: Makefile:168: *** missing separator. Stop. What is causing this?

I've got an Elixir application running inside a Docker container (in my laptop). The Elixir application was executed with the following command: iex \ --name test@1.2.3.4 \ --cookie secret \ ...