Eric R. Thern
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Minimizing downtime associated with Web/DNS/Mail IP address migrations

By Eric Thern On April 3, 2010 · Leave a Comment

Migrating servers to new datacenters or IP addresses is never entirely problem free, usually due to many DNS servers on the internet not obeying TTL’s or caching old records for way too long.

These old cached DNS records (usually at different ISP’s, major mailservers like google, hotmail, yahoo, etc.) cause problems where they’ll route mail [...]

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Moving wordpress from a subdirectory – and generation of 301 redirects from a google sitemap

By Eric Thern On February 25, 2010 · Leave a Comment

So I mistakenly have installed wordpress in a subdirectory on my site – this worked well for testing, but I didn’t buy this domain to have my entire site sitting within a subdirectory!

WordPress has a good guide on this subject, which has step by step instructions on migrating your installation from one directory to [...]

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FreeBSD Plesk 8 – installing php5 as CGI alongside php4

By Eric Thern On November 26, 2007 · Leave a Comment

If you have ever needed php5 to run along side php4, you can always compile php5 as a CGI, and let php4 remain as an apache module.

Here we’ve compiled php5 from FreeBSD’s ports, and have installed it as a CGI so that specific vhosts will run on this new php5. The installation was done [...]

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Dealing with Apache referrer spam

By Eric Thern On September 29, 2007 · Leave a Comment

I’ve had a number of sites get hammered by referrer spam lately, and had to look into methods of stopping, or at least slowing the attacks.

Referrer spam is when a group of random (probably trojan or hacked computers) or single computers hit random pages on your site with faked referrer values, typically all [...]

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Eric R. Thern

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