Hackvalue - Tales from the trenches of specialized web hosting and development

Hackvalue is the corporate blog of Loco, a company that does lots of interesting stuff gravitating around Free and Open Source software and licensing, web development, and anything else that we find interesting.

In this particular part of the blog all content is English, but if you have no problems reading Dutch, then the Dutch part of this blog might also be interesting for you. It caters to a slightly different crowd.
If you're wondering why we use the name Hackvalue, please read the FAQ.

Book review: Everything you know about CSS is wrong

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Joor Loohuis, January 3, 2010, 6054 views.

While 'Everything you know about CSS is wrong' may be a presumptuous title for a book, it discusses an important development in the layout of websites and applications. The book provides an in-depth discussion of the advantages of CSS table display styles.

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Automated certificate expiration checks on CentOS

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Joor Loohuis, December 20, 2009, 11623 views.

It is essential to keep track of the expiration dates of SSL certificates, and so it's useful to have a periodic check on all certificates in use on a system, that will alert systems administrators when a certificate is about to expire. This article shows one way of setting up such a procedure for CentOS and other RHEL derivatives.

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Bad requests from the Reed Elsevier search engine

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Joor Loohuis, December 3, 2009, 4779 views.

Over the last weeks we're seeing ever increasing amounts of strange requests from a crawler that runs on IP addresses used by Reed-Elsevier in Australia. Time for some online forensics.

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One off system backup methods

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Armijn Hemel, December 1, 2009, 6340 views.

Before a new system install it is smart to do a backup of important personal data. There are various methods how you can do this.

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Off-by-one errors in background placement in web browsers

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Joor Loohuis, November 26, 2009, 8371 views.

The rendering engines in some popular web browsers contain a bug, where a background positioned in the center of a block element is sometimes offset by one pixel relative to an element that is positioned with automatic margins.

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