1.4. Types of Pacemaker Clusters
Pacemaker makes no assumptions about your environment, this allows it to support practically any
redundancy configuration including Active/Active, Active/Passive, N+1, N+M, N-to-1 and N-to-N.
In this document we will focus on the setup of a highly available Apache web server with an Active/Passive cluster using DRBD and Ext4 to store data. Then, we will upgrade this cluster to Active/Active using GFS2.