So this is what it is…. if you need help with the setup please use the contact form.
rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
yum install varnish.x86_64 or aptitude install varnish
edit /etc/default/varnish or /etc/sysconfig/varnish — change ports as required
edit /etc/varnish/vcl.conf or /etc/varnish/default.vcl — change backend information
/usr/local/psa/admin/sbin/websrvmng –set-http-port –port=80
go to tweak settings in WHM and change the port for apache to a non standard one (say 8081)
stop/start apache make sure its listening on new port