Pacemaker is a high-availability cluster resource manager.
It achieves maximum availability for your cluster services (a.k.a. resources) by detecting and recovering from node- and resource-level failures by making use of the messaging and membership capabilities provided by Corosync.
It can do this for clusters of practically any size and comes with a powerful dependency model that allows the administrator to accurately express the relationships (both ordering and location) between the cluster resources.
Virtually anything that can be scripted can be managed as part of a Pacemaker cluster.
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Building from Source
Pacemaker can also be compiled from source for many Linux distributions and BSD-based operating systems. See SourceInstall for more information.
|Series||First Released||Latest Version||Release Date||Next Release Planned|
|2.0||6 Jul 2018||2.0.3||25 November 2019||mid-2020|
|1.1||15 Jan 2010||1.1.23||22 June 2020||late 2020 (final release)|
|Series||Last Release||First Released||Last Released|
|1.0||1.0.13||9 Oct 2008||13 Feb 2013|
|0.7||0.7.3||25 Jun 2008||22 Sep 2008|
|0.6||0.6.7||16 Jan 2008||15 Dec 2008|
See Also: Releases
Common node configurations that are possible to configure with Pacemaker.
See the "Cluster Architecture" section of Pacemaker Explained from the Pacemaker documentation set.
Although simple to configure, the old Heartbeat version 1 cluster manager had four key deficiencies:
- Maximum of 2 nodes
- Highly coupled design and implementation
- Overly simplistic group-based resource model
- Inability to detect and recover from resource-level failures
In 2005, Heartbeat 2.0.0 was released containing the first public version of the new CRM.
After many successful releases, the decision was made at the end of 2007 to spin off the CRM into its own project after the 2.1.3 Heartbeat release in order to:
- support both the OpenAIS and Heartbeat cluster stacks equally
- decouple the release cycles of two projects at very different stages of their life cycles
- foster clearer package boundaries, thus leading to
- better and more stable interfaces
This transition was completed in 2008 with the 0.6.0 release of Pacemaker which was the first to support both cluster stacks. The 0.6 series was derived from, and fully compatible with, the 2.1.3 CRM. It received bug-fix-only updates throughout 2008 and 2009 before being deprecated in March 2010.
The Pacemaker 1.0 series contained many improvements over prior releases, including:
- A more intuitive syntax
- Failure (migration) thresholds and timeouts
- Tool for making offline configuration changes
- A unified command line configuration tool that hides the underlying XML
- Rules, instance_attributes, meta_attributes and sets of operations can be deﬁned once and referenced in multiple places
- The ability to connect to the CIB from non-cluster machines
- Allow recurring actions to be triggered at known times
- A more powerful RelaxNG-based configuration schema