lukas.im

Selling dehydrated

Lukas Schauer — Thu, 30 Jan 2020 01:14:00 +0100

TLDR: dehydrated will move, the license will NOT change, and I will still take care of the project

A few days ago I was approached by Julian from apilayer who told me that they wanted to buy dehydrated as a project and that they would even like to pay me to continue working on it.

They made an acceptable offer and after a good night's sleep I agreed.

Reinstall Debian over serial console

Lukas Schauer — Sat, 26 Mar 2016 00:26:00 +0100

I ordered an SC2016 at online.net yesterday, and wanted to reinstall it with encrypted rootfs.

All my other servers had KVM consoles and possibilities to mount CD images, but this one only had a serial console and a rescue system, so I had to be a little bit creative.

ASRock C2750D4I Fan-Control

Lukas Schauer — Sun, 21 Feb 2016 00:04:00 +0100

Just a quick note on how to reconfigure fan speeds on an ASRock C2750D4I (and similar) board without rebooting into BIOS.

Configuring EdgeRouter for internet over PPTP (Part 2)

Lukas Schauer — Sat, 20 Feb 2016 23:47:00 +0100

In the last post I showed you how to configure an Ubiquiti EdgeRouter to use kernelmode PPTP.

This post will be a continuation on the general config, showing how to set up the local network.

Fast PPTP client on Ubiquiti EdgeRouter (+ basic config for STW Bonn)

Lukas Schauer — Sat, 13 Feb 2016 22:00:00 +0100

I'm currently living in a building of Studierendenwerk Bonn and for our internet connection we have to use a PPTP client.

As a big fan of the Ubiquiti EdgeMax series of routers I wanted to use my EdgeRouter PoE for this, but there is a problem: PPTP on EdgeMax devices is running in Userland, and it is slow, very very slow. Of my 100Mbit/s connection i was only able to get around 12Mbit/s, this is not good.

Unfortunately Ubiquiti doesn't see improving this as a priority, so I'll have to fix it myself. Here is a tutorial on how to configure PPTP on EdgeMax devices to run with the pptp kernel module.

letsencrypt.sh

Lukas Schauer — Wed, 10 Feb 2016 12:49:00 +0100

Trusted SSL certificates used to cost money, but in the past companies like StartCom already started to hand out domain-verified certificates for free, but now we have Let's Encrypt, which takes a different approach.

Replace broken USB-Stick in Ubiquiti EdgeMax routers

Lukas Schauer — Mon, 25 Jan 2016 19:48:00 +0100

In this blog post I'm going to explain how to replace a broken USB-stick in Ubiquiti EdgeMax Routers or in this case the Ubiquiti EdgeMax EdgeRouter-POE. This guide can also be used to recover from a failed firmware update.

First thing you have to do is to get a new …

Hide process list from users

Lukas Schauer — Tue, 22 Jul 2014 15:48:00 +0200

If you have multiple users on a single machine every user can normally see all running processes, their own, other users processes and even system processes. Sometimes people append sensitive data like passwords to a command, and since you can see the process list you'll also get that password, which …

dpkg-divert

Lukas Schauer — Tue, 15 Jul 2014 01:07:00 +0200

Just a short note for myself...

To move a dpkg-managed file out of the way:

dpkg-divert --rename --divert /usr/share/initramfs-tools/dropbear.original /usr/share/initramfs-tools/scripts/init-premount/dropbear

Copy and edit original.

cp /usr/share/initramfs-tools/dropbear.original /usr/share/initramfs-tools/scripts/init-premount/dropbear
ed /usr/share/initramfs-tools/scripts …

Power over Ethernet on Raspberry Pi

Lukas Schauer — Sun, 13 Jul 2014 23:50:00 +0200

I have a few devices that support (passive) power-over-ethernet, and I quite like that as I don't need a power supply for every single device filling up my power strip and I even can mount devices further away where there is no power available.

The Raspberry Pi board normally has …

DIY IP-KVM

Lukas Schauer — Sun, 01 Jun 2014 01:07:00 +0200

Note: This is a slightly updated version of the old blogpost (re-written on 2016/01/25).

I really like IP-KVMs. They are great devices that allow you to directly connect to and control your computer from basically anywhere in the world, even if your system crashed or your network card …

🇩🇪 Fledermaus-Lichtschranken-Fail

Lukas Schauer — Tue, 27 May 2014 05:57:00 +0200

Nur kurz am Rande: Der Fledermauslichtschrankenaufbau hat uns über knapp einen Monat wunderbar Daten geliefert, danach fielen jedoch nach und nach die Sensoren aus.

Das Problem: Wildbienen. Die Tiere scheinen sich wohl im Infrarot-Licht wohl zu fühlen... naja... das Experiment ist jetzt auf jeden Fall abgebrochen.

Resize CoreOS rootfs

Lukas Schauer — Mon, 07 Apr 2014 19:27:00 +0200

I was playing around with CoreOS in the last few days and i had a problem that the "installer" only created a 3GB GPT-label, with the problem that the backup header wasn't at the end of my disk but at the end of this 3GB section, so I couldn't just …

Outgoing IPv6-address

Lukas Schauer — Mon, 07 Apr 2014 17:27:00 +0200

On my server I have multiple IPv6 addresses, but I want to define that all outgoing connections should always use one specific address.

On Linux there is an option to mark an IPv6 address as "deprecated", you can do that by setting the address parameter preferred_lft to 0. After that …

🇩🇪 Fledermaus Lichtschranke

Lukas Schauer — Fri, 14 Mar 2014 17:20:00 +0100

Eine Lichtschrankeninstallation zur Überwachung von Fledermausbewegungen an einem Quartier

Software: https://github.com/lukas2511/FlederSchranke (Installationsanleitung)

Wordclock

Lukas Schauer — Thu, 21 Nov 2013 00:00:00 +0100

A few months ago somebody used the lasercutter at Dingfabrik to cut a box for a clock that shows time using words. I liked the idea so I asked for a box, and I got one.

Now... originally this should've been a birthday present for my dad, but the controller …

Kobo Mini Telnet/FTP Server

Lukas Schauer — Tue, 01 Jan 2013 22:02:00 +0100

I recently bought a Kobo Mini ebook reader because I wanted to play around with the e-ink display. To do that I obviously needed a shell on the device, and here I'll describe how I got that.

There are basically two ways to get the (already built-in) telnet- and ftp-server …

Change Windows 7 SATA driver mode from AHCI to RAID (Intel Chipset)

Lukas Schauer — Thu, 25 Oct 2012 17:46:00 +0200

I wanted to use a Intel Rapid Storage controller in "RAID" mode, but Windows 7 didn't like me changing that option and refused to boot, just showing me a very generic bsod.

After quite some time I found a solution:

First start from the installer disc and go to recovery …

Mac App: Wineskin Winery

Lukas Schauer — Sat, 04 Aug 2012 19:21:00 +0200

Sometimes there is the need to run a piece of Windows software, and if you don't have Windows running on your system you will need a workaround. Solutions are using a virtual machine with Windows or using wine, which can sometimes be a bit annoying.

As a mac user there …