| Initial release | 2004 |
|---|---|
| Stable release | 2.1.7[1] 
/ 19 December 2023 |
| Repository | github |
| Written in | C |
| Operating system | Cross-platform |
| Type | Group communication system |
| License | GNU General Public License Version 2[2] |
| Website | clusterlabs |
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]
It implements several APIs for controlling resources, but its preferred API for this purpose is the Open Cluster Framework resource agent API.