My Name is John Cahill. I am a Linux sys admin. I currently work for a small telecoms company specialising in open source telephony solutions based on Asterisk. I have many technical and scientific interests. Some of my current obsessions are: high availability computing, Linux clusters and systems monitoring using tools such as Munin and Nagios.I’ve built a number of Asterisk based VOIP clusters recently and I intend this site to be a brain dump of how I did this. I will also include any other interesting tech stuff I’ve stumbled upon along the way.