Pacemaker is an open-source high availability resource manager software yakashandiswa pamakomputa masumbu kubvira 2004. Kusvika munenge muna 2007, yaive chikamu cheLinux-HA project, ndokuzopatsanurwa kuti ive yayo yega. Inoshandisa maAPI akati wandei ekudzora zviwanikwa, asi yaanofarira API yechinangwa ichi ndiyo Open Cluster Framework resource agent API.