Author Archive | Michael Franzl

Boot your Raspberry Pi from nothing but an Ethernet cable

Zero Client: Boot kernel and root filesystem from network with a Raspberry Pi2 or Pi3

A Zero Client is a computer that has nothing on its permanent storage but a bootloader. Rather, it loads everything from the network. With the method presented in this article, you will be able to boot a Raspberry Pi into a full Debian OS with nothing more on the SD card other than the Raspberry firmware […]

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Hardening WordPress against hacking attempts

The WordPress Codex states: Security in WordPress is taken very seriously This may be the case, but in reality, you yourself have to take some additional measures so that you won’t have a false sense of security. With the default settings of WordPress and PHP, the minute you host Wordpress and give access to one non-security-conscientious administrative user, your […]

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no.php – Transparent reverse proxy written in PHP that allows you to not have to write PHP any more

This little project will probably be my only contribution to the world of PHP. The code is at https://github.com/michaelfranzl/no.php This short, single-file, 80-line PHP script is a simple and fully transparent HTTP(S) reverse proxy written in PHP that allows you to never have to use PHP again for a new project, if you feel so […]

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Plot of apparent diameter of Jupiter for the time period 2017-2026

Apparent diameter plot for Jupiter 2017-2026

The apparent diameter of Jupiter varies with the Earth-Jupiter distance. Depending on the distance, the apparent angular diameter of Jupiter is between approx. 0.5 and 0.8 arcminutes. For best astrophotography results, one should pick a time when Jupiter is closest. Similar to my plot of the apparent size of Venus, I wrote a short program to plot Jupiter’s apparent diameter for the […]

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Plot of the apparent diameter of the Moon for the time period 2017-2018

Apparent diameter plot for the Moon 2017-2018

The apparent diameter of the Moon varies with the Earth-Moon distance. Depending on the distance, the apparent angular diameter of the Moon is between 29.4 and 33.5 arcminutes. For best astrophotography results, one should pick a time when the moon is closest. Similar to my plot of the apparent size of Venus, I wrote a short program to plot the Moon’s […]

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Phases of Venus and evolution of its apparent diameter. (Statis Kalyvas - VT-2004 programme)

Venus apparent diameter plot for 2017-2020

The apparent size of Venus varies dramatically with the Earth-Venus distance, depending on both orbits around the sun. The apparent angular diameter of Venus is between 0.175 and 1 arcminutes. Wikipedia has nice images on that and says that… “the extreme crescent phase of Venus can be seen without a telescope by those with exceptionally acute eyesight, at the […]

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Reading Raspberry Pi chip temperature with mainline Linux kernel

This tutorial is based on a previous article where we installed pure Debian 9 with a recent mainline/vanilla Linux kernel on a Raspberry Pi, and so differs from what would be done on a Raspbian Distribution with a Raspbian kernel. In this article, we will read the Raspberry Pi chip temperature. Here is my previous article: Raspberry […]

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Gnome on Wayland on Raspberry Pi 2

Raspberry Pi2 and Pi3 running pure Debian 9 (“Stretch”) and the Linux Mainline/Vanilla Kernel

Update 2017 Feb 25: I have updated the step-by-step instructions based on the suggested fixes and improvements contained in the reader comments. I also have copied the step-by-step instructions from this blog post to the README.md file hosted on https://github.com/michaelfranzl/rpi23-gen-image. From now on I will update the instructions only on github, so expect that the instructions in this […]

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