Two Node Apache Web Server Clustering using Pacemaker on CentOS 7

Pacemaker is a High Availability cluster Software in Linux.Steps to configure two Node Apache Web Server Cluster using Pacemaker on CentOS 7.

Source: Two Node Apache Web Server Clustering using Pacemaker on CentOS 7

Debian link as well

http://blog.non-a.net/2011/03/27/cluster_drbd