Oracle 5.0 Reference Manual page 1346

Overview of MySQL with DRBD/Pacemaker/Corosync/Oracle Linux
Figure 15.2. MySQL, DRBD, Pacemaker, and Corosync Stack
The core Pacemaker process does not have built-in knowledge of the specific services to be managed;
instead, it uses agents that provide a wrapper for the service-specific actions. For example, in this
solution we use agents for Virtual IP Addresses, MySQL and DRBD: these are all existing agents and
come packaged with Pacemaker.
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