# Pacemaker

## What is Pacemaker?

Pacemaker is an advanced, scalable high-availability cluster resource manager.

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.

## Who is Pacemaker?

Pacemaker is distributed by [ClusterLabs](http://www.clusterlabs.org).

Pacemaker was initially created by main architect and lead developer

Andrew Beekhof <andrew@beekhof.net>, with the aid of

project catalyst and advocate Lars Marowsky-Brée <lmb@suse.de>.

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.

## Where do I get Pacemaker?

Pacemaker source code is distributed via

[Github](https://github.com/ClusterLabs/pacemaker).

From there, you can clone or download the repository to get the latest

development code, or download one of the official

[releases](https://github.com/ClusterLabs/pacemaker/releases).

## How do I install Pacemaker?

See [INSTALL.md](https://github.com/ClusterLabs/pacemaker/blob/master/INSTALL.md).

## What higher-level interfaces to Pacemaker are available?

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

* Striker: https://github.com/ClusterLabs/striker

### Can I convert some other cluster configuration to Pacemaker?

[clufter](https://github.com/jnpkrn/clufter) is a general-purpose tool

for converting one cluster representation format to another. Among other

possibilities, it can convert from a cluster based on rgmanager with CMAN to

a one based on pacemaker with corosync. See its documentation for details.

## How can I help?

See [CONTRIBUTING.md](https://github.com/ClusterLabs/pacemaker/blob/master/CONTRIBUTING.md).

## Where can I find more information about Pacemaker?

* [ClusterLabs website](http://www.clusterlabs.org/)

* [Documentation](http://www.clusterlabs.org/doc/)

* [Issues/Bugs](http://bugs.clusterlabs.org/)

* Mailing lists for [users](http://oss.clusterlabs.org/mailman/listinfo/users) and [developers](http://oss.clusterlabs.org/mailman/listinfo/developers)

* #clusterlabs IRC channel on [freenode](http://freenode.net/)