DenyHosts setup on Red Hat/Centos/Amazon AMIs

This is a really useful tutorial for setting up DenyHosts to protect against brute force ssh attacks.

http://www.cyberciti.biz/faq/rhel-linux-block-ssh-dictionary-brute-force-attacks/

DenyHosts homepage:

http://denyhosts.sourceforge.net/

pv

This was so good I had to repost it here.  It is about a useful utility called pv which shows a progress report of running processes:

http://www.dp.cx/blog/pv--one-of-the-most-useful-applications-around.html