Pacemaker is an advanced, scalable high-availability cluster resource manager. It runs on top of a cluster communication layer, either Corosync or Linux-HA's Heartbeat.

It supports "N-node" clusters with significant capabilities for managing resources and dependencies.

It will run scripts at initialization, when machines go up or down, when related resources fail and can be configured to periodically check resource health.

Pacemaker is distributed by ClusterLabs.

Pacemaker was initially created by main architect and lead developer Andrew Beekhof [email protected], with the aid of project catalyst and advocate Lars Marowsky-Brée [email protected].

Many, many developers have contributed significantly to the project since. The git log is the definitive record of their greatly appreciated contributions.

The wider community of Pacemaker users is another essential aspect of the project's existence, especially the many users who participate in the mailing lists, blog about HA clustering, and otherwise actively make the project more useful.

See INSTALL.md.

There are multiple user interfaces for Pacemaker, including command-line tools, graphical user interfaces and web frontends. The crm shell used to be included in the Pacemaker source tree, but is now a separate project.

This is not an exhaustive list:

• crmsh: https://github.com/ClusterLabs/crmsh
• pcs: https://github.com/ClusterLabs/pcs
• LCMC: http://lcmc.sourceforge.net/
• hawk: https://github.com/ClusterLabs/hawk
• Pacemaker-mgmt: https://github.com/ClusterLabs/pacemaker-mgmt
• Striker: https://github.com/ClusterLabs/striker

See CONTRIBUTING.md.

• ClusterLabs website
• Documentation
• Issues/Bugs
• Mailing lists for users and developers
• #clusterlabs IRC channel on freenode