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Author: halfgaar

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.

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 inconveniences of encryption is the need to open the encrypted volume by hand when the computer/server boots. Luckily, you can easily automate that securely. You need a machine that will act as a key server, whether that's a Raspberry Pi or some VPS you hire. 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 »

Iptables: limiting amount of connections per IP

Short and improved version of this. Read More »

Dumping MySQL users and grants

MySQL stores its users and grants in a very annoying, non-clonable format. I found this post, describing how you can extra them. Read More »