DTrace and Perl

DTrace provides powerful tracing abilities, combined with perl's support for user defined trace points gives powerful insight into Perl. More..

Make OpenSSH require keys selectively

This is one of those things that I've been doing for ages and is easy to find if you read the fine manual, but not many places online seem to suggest it. More..

A database of URL shortening services

I found myself with a need for a list of URL shortening services but I couldn't find a good one. Where I define "good" as "available in a sensible format and kept up-to-date". More..

Dear BBC...

It may have escaped your attention that "The Delicious Miss Dahl" is supposed to be a cookery programme. More..

Using HAProxy to make SSH and SSL available on the same port

Certain places firewall TCP ports other than the most common ports. There are many techniques for bypassing such restrictions. One simple approach is to run a SSH daemon on port 443, however a downside of this is you need to dedicate an IP address to this SSH service. More..