Pacemaker (software)

Pacemaker is an open-source high availability resource manager software used on computer clusters since 2004. Until about 2007, it was part of the Linux-HA project, then was split out to be its own project.^[3]

Initial release2004

Stable release

3.0.1^[1]  / 7 August 2025; 6 months ago (7 August 2025)

Written inC

Operating systemCross-platform

Quick facts Initial release, Stable release ...

Pacemaker
Initial release	2004
Stable release	3.0.1[1]  / 7 August 2025; 6 months ago (7 August 2025)
Written in	C
Operating system	Cross-platform
Type	Group communication system
License	GNU General Public License Version 2[2]
Website	www.clusterlabs.org/pacemaker/
Repository	github.com/ClusterLabs/pacemaker

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It implements several APIs for controlling resources, but its preferred API for this purpose is the Open Cluster Framework resource agent API.