today's howtos

posted by Roy Schestowitz on Apr 02, 2026

• Sean Conner ☛ I'm giving up on the Brazilian SYN attacks

  For the past few months I've been slowly building up a list of Brazilian networks to block, and if the theory of why it's happening is true, then it's going to be a long slog of banning Brazilian networks for, if not months, then years (with a reported 21,000+ ISPs in Brazil … yeah). Just yesterday, I ended up blocking somewhere around 10 networks before I stopped and asked myself, Myself, how did I get here?

• Alvaro Montoro ☛ CSS in City

  This city is built with CSS. No SVG. No images. No HTML. Just gradients... and a bit of patience.

• Vinay Keerthi ☛ I Traced My Traffic Through a Home Tailscale Exit Node

  Before getting into routing, I want to cover how Tailscale connects devices in the first place. I’ve been comparing it to a VPN, but Tailscale is really a mesh network with a control plane on top of WireGuard.

• GonzaloR ☛ Plakar on OpenBSD

  Plakar is really cool and easy going to use, on OpenBSD has some limitations (for now, I am taking care of bothering op@ enough to fix them all), specially on the concurrency and the amount of open files, for example backup your full home or a big large directory can lead to some issues (this is fine on Loonix), for example crashing the plakar agent. Again, this is taking care of closely, so should be fix soon.

  What we can do with Plakar? A lot, specially backup to a different places and technologies, for example S3, Dropbox, iCloud among others, those are called integrations and they have plenty. We are gonna focus now on the basic one, and how a normal backup flow will look from a local directory to an external disk on my OpenBSD machine.

• Linuxize ☛ lsof Command in Linux: List Open Files and Network Connections

  The lsof command lists every open file, socket, and network connection on a GNU/Linux system. This guide covers how to find what is using a port, trace open files by process or user, and recover disk space from deleted but held-open files.

• Linuxize ☛ lsof Cheatsheet

  Quick reference for finding open files, processes, ports, and deleted files with lsof in Linux

• idroot

  • ID Root ☛ How To Install DirectAdmin on Debian 13

    Managing a web server without a control panel means handling every config file by hand. That gets slow fast. DirectAdmin is a lightweight, fast, and reliable hosting control panel that simplifies managing websites, email, DNS, and databases from a clean browser interface.

  • ID Root ☛ How To Install NRPE on Ubuntu 24.04 LTS

    If you manage GNU/Linux servers without centralized monitoring, you are flying blind. A single undetected disk filling up or a runaway process can bring down a production environment before you even notice. NRPE (Nagios Remote Plugin Executor) solves this problem by giving your Nagios server eyes and ears on every remote host in your infrastructure.

  • ID Root ☛ How To Install OpenVPN on openSUSE

    Running a self-hosted VPN is one of the most practical things a sysadmin can do. It keeps remote traffic encrypted, secures inter-office connections, and gives you full control over who connects to your infrastructure. If you want to install OpenVPN on openSUSE, you are in the right place.

• LinuxConfig ☛ How to Use Tmux Terminal Multiplexer on Ubuntu 26.04

• LinuxConfig ☛ How to Install and Configure Git on Ubuntu 26.04

• Linux Capable ☛ How to Install MariaDB on Fedora Linux

  Fedora 43 ships two MariaDB branches in its own repositories, so you can install MariaDB on Fedora and move straight into hardening and your first database login without adding a third-party repo.

• Linux Capable ☛ How to Install Composer on Fedora Linux

  PHP projects drift fast when each machine resolves a different dependency tree. You can install Composer on Fedora from the official repositories or with the upstream installer, then use it to lock package versions, pull dependencies from Packagist, and keep deployments predictable.