10 May 2011
http://www.howtoforge.com/setting-up-a-high-availability-load-balancer-… - load balancer com fail over e suporte a sessões
http://library.linode.com/linux-ha/ip-failover-heartbeat-pacemaker-debi…
http://www.ctrip.ufl.edu/apache2-mysql-cluster-in-debian-lenny-howto