Why you should regularly make backups

The answer is: Because if you don’t, then this mistake will bite you, sooner or later. Why? Because of Murphy’s Law: Anything that can go wrong, will go wrong. And because a variation of it, Finagle’s law: Anything that can go wrong, will—at the worst possible moment. The worst case scenario is that all your (and […]

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Mysql screenshot

A solution for MySQL Assertion failure FIL_NULL

A defective RAM module recently caused data corruption in MySQL tables. MySQL would log the following to /var/log/syslog  in regular intervals, about every few minutes:

Reading MySQL documentation and various blogs didn’t help much. I ran CHECK TABLES  on all the tables and they all reported OK. Then I ran

and still all tables reported OK. […]

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Adventures with various Segfaults due to defective RAM

If you get various segfaults on your Linux server, like these:




etc. etc., then, no, your system is not suddenly crazy. Nor are you. It is highly likely that you RAM is defective. You should reboot your server and run the  RAM test from your boot manager (Grub […]

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How to set up audio streaming (internet radio) in Linux

This tutorial will show you how you can go live with your own internet radio station in a few minutes. Demystifying “streams” There is a lot of information, disinformation and irrelevant information about this in the internet. When you listen to internet radio, and you inspect the network requests in your Google Chrome Developer Tools […]

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Latex Footnotes

Citations within footnotes in LaTeX

Writing a tutorial on programming, I needed citations within footnotes. Luckily, the biblatex package added support (see first comment on the sourceforge page of biblatex) for citations within footnotes in 2011. Apparently, this is not straightforward, since a low-level citation command has to be used to satisfy LaTeX. Anyway, this is now done automatically by […]

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Removing millions of files in a directory

Since my Exim email server wan’t configured for Spam detection, it became blacklisted and was storing literally millions of Spam emails in the mail queue (which are stored as regular files in the directories /var/spool/exim4/input and /var/spool/exim4/msglog. There were so many files that I could not remove them with the rm ./* command any more, […]

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