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Author: halfgaar

http://www.halfgaar.net/

Halfgaar is Wiebe. Wiebe is a contributing author on this weblog. He also has a lot of stuff (such as long, in-depth articles) on his personal website.

Wiebe works at YTEC, where he is a senior developer of customer-specific tailor-made software (“klantspecifieke maatwerk software“) for clients in a few select markets: wholesale, printing and healthcare.

My Front suspension

On my Multi Cycle bike, I have a SR Suntour CR9, serial number TF00478709, Series: CR, Year: 2015, Name: CR 9V-D-P-LO 700C TS 300/0, from 2015. Read More »

Using ‘Require expr’ in Apache: Cannot parse expression in require line: syntax error, unexpected $end

We found that if you do what the Apache documentation says and put quotes around the expr: Require user victron Require expr "%{REQUEST_URI} =~ m#^/.well-known/acme-challenge/.*#" Read More »

More recent posts on YTEC blog

As Bigsmoke indicated, we had some issues with google not finding content. For the same reason, I would like to share my insight into some stuff I write about: Read More »

Sending mail from a NATed host with Postfix

When sending mail from a host behind NAT, you will run into trouble when the "From" says "root@host.localdomain", because receiving servers will refuse that domain. Read More »

Download dmcrypt (cryptsetup) encryption key from remote server and auto mount

One of the inconviences of encryption is the need to open the encrypted volume by hand when the computer/server boots. Luckily, you can easily automate that. You need a machine that will act as a key server. Read More »

Preventing degraded array on every boot

I had a server that booted with a degraded array every time, because there was a USB drive attached to it, that messed up the auto detection. I solved it by putting this in mdadm.conf: Read More »

Decreasing shutdown time of MySQL with large transaction log file

If you need/have a large transaction log file, a shut down can take a while. This post lists how you can force a flush before you do so, decreasing shut down time. Read More »

Excellent article about LC resonance resulting from turn-on transients

This article gives a good explation of LC resonances caused by turn-on transients. Read More »

Better nagios SMS and E-mail messages

Just for my references. I made changes to it before, but I now added the comments to them (for custom notifications and acknowledgements): Read More »

Teamviewer replacements

ChunkVNC consists of three parts, InstantSupport, Repeater and Viewer. Read More »