Pacemaker is an Open Source resource manager for cluster systems operated on Linux.
Pacemaker is offered as a standard module for many popular Linux distributions, otherwise it is available as a free extension.
Pacemaker makes a considerable contribution to achieving high availability with the management and monitoring of server services started via script, even on large systems. Pacemaker is generally used in conjunction with Corosync or Heartbeat. Corosync organizes the communication between the cluster nodes.