Pacemaker is an open source high-availability cluster software developed as a collaborative effort between Red Hat and Novell. Pacemaker clustering ensures vital resources receive increased availability. In the event of a failure, Pacemaker detects and automatically recovers virtual machines (VMs), applications and application-level features. The software then determines an optimal location for the service, based on cluster constraints. Pacemaker also supports redundancy configurations.
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The software requires at least two Linux servers, but supports multiple deployment scenarios, from 2-node standby clusters to 16-node active/active configurations. Pacemaker also allows several active/passive clusters to be combined and to share a common backup node, which can reduce hardware costs.
Pacemaker is considered a de facto standard for Linux high availability (HA).