The July 2012 issue of BSD Magazine has an article by yours truly: freebsd-update as an Intrusion Detection System.
It also has a code to get you 30% off of Absolute FreeBSD at No Starch Press. If you don’t have your copy of this book, here’s your chance.
It has other good articles too. None as awe-inspiring as mine, of course, but definitely worth a read.Stalk me on social media