How to install Deny Hosts on Fedora 8:
1) yum list denyhosts
2) yum install packages listed (in this case it was: yum install denyhosts.noarch)
3) chkconfig denyhosts on (set it to start on boot. Same as putting a check in Webmin>System>Boot )
4) /etc/init.d/denyhosts start (this will start it up)
5) use ps -A | grep deny to make sure its loaded
6) Config file is in /etc/denyhosts.conf if you want to have a look at it
7) Hosts that it blocks will be in /etc/hosts.deny
8) cat /etc/hosts.deny | grep ^ssh | wc -l Will let you know how many sites have been blocked