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today's howtos

  • OpenVPN as default gateway on OpenBSD

    If you plan to use an OpenVPN tunnel to reach your default gateway, which would make the tun interface in the egress group, and use tun0 in your pf.conf which is loaded before OpenVPN starts?

    Here are the few tips I use to solve the problems.

  • How to Setup a Firewall with UFW on Ubuntu 20.04 - Linux Concept

    Nowadays, a Firewall is an essential utility and property of any system for security; by default Ubuntu Operating system having a firewall configuration tool named UFW (Uncomplicated Firewall). UFW is a user-friendly front-end tool to manage iptables firewall rules. It provides you more straightforward methods to manage iptables as the name of this tool start from Uncomplicated.

  • Install Ubuntu on a USB Hard Drive | Pen Drive Linux

    How to Install Ubuntu on a USB hard drive using live media. Believe it or not, creating a completely Portable Ubuntu Installation on USB is a relatively simple process. As a matter of fact, it's almost as simple as a regular Ubuntu internal hard drive installation. Due to popular demand, we have decided to write a simple tutorial on the full Ubuntu USB hard drive installation procedure. So go grab an available external USB hard drive and a nice cold beverage and lets get started.

  • Best Tools to Create a Bootable Linux USB Drive

    Unlike Windows, Linux distributions require a third-party tool to create a bootable USB. It is particularly handy with modern PCs which have done away with the old DVD-drives. Also, installation DVDs were quite delicate and would scratch or in worst-case scenarios, break apart under stress. This guide covers some of the best tools that you can use to create a bootable Linux USB drive.

  • 5 new sudo features you need to know in 2020 | Opensource.com

    When you want to perform an action on a POSIX system, one of the safest ways to do so is to use the sudo command. Unlike logging in as the root user and performing what could be a dangerous action, sudo grants any user designated as a "sudoer" by the sysadmin temporary permission to perform a normally restricted activity. This system has helped keep Linux, Unix, and macOS systems safe from silly mistakes and malicious attacks for decades, and it is the default administrative mechanism on all major Linux distributions today.

Open Hardware/Modding Leftovers

  • Arduino Blog » ESUB Tracks is a smart bicycle helmet with built-in electronics for enhanced safety

    Bike helmets can help minimize injuries in the event of an accident, but could a helmet also be used to help prevent a crash, or even enhance your riding experience? ESUB Tracks from WertelOberfell attempts to do both, featuring a variety of electronic enhancements which are powered by photovoltaic cells wrapped around its outer surface. ESUB Tracks includes a lighting arrangement on the back for turn signaling, triggered using voice commands to the helmet’s piezoelectric microphone. Additionally, it has a sensor to detect rapidly approaching vehicles from behind, warning the wearer of this condition via haptic feedback. Bone-conductive speakers are provided for listening to Bluetooth audio, and if all of that wasn’t enough, it even tightens down the straps when the buckle is fastened.

  • Take part in the PA Raspberry Pi Competition for UK schools
  • ESP32-S2 board targets battery-powered applications with 30uA deep sleep power consumption

    A few months ago, Olimex unveiled renders of ESP32-S2-Devkit-LiPo WiFi board that was supposed to consume as little as 2uA in sleep mode, follows ESP32-S2-Saola-1 board form factor and pinout, and adds an ultra-efficient circuitry to support LiPo batteries. The good news is that Olimex has now launched two versions of their ESP32-S2 board optimized for battery-powered applications with ESP32-S2-DevKit-Lipo and ESP32-S2-WROVER-DevKit-Lipo (with 2MB PSRAM) going for 5.56 Euros and 6.36 Euros respectively.

  • Testing PTFE Tube for 3D Printing

    Karl here. I’m back with a short article on some testing that I did on PTFE tube. When I received the Sovol SV02 3D printer it came with some baby blue replacement PTFE tube. It came preinstalled with the regular white stuff that most Bowden style printers come with. I have also been thinking about different ways to use the Retraction Calibration Tool I created.

Android Leftovers

Now and Then: What happened to 5 promising file managers?

It’s fun to experiment with new software that isn’t anywhere near the polished article. But there’s associated risks, even with open source software. You’ll invest time and effort in learning new software. That software might never even see a stable release, it might be a big time sink even getting it up-and-running on your system. The upside is that promising software might turn overnight into a huge success, or it might be a slow burn success. And while there’s a huge array of open source successes, there’s been awful open source failures along the way. It can be a bumpy ride! A file manager is software which provides a user interface to assist in the organization of files. It helps users with their daily work in managing their files on a hard drive or other storage device. With multiple terabyte hard disks becoming prevalent, file managers represent an essential tool in managing file systems. Read more