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Pacemaker 1.0 Configuration Explained
An A-Z guide to Pacemaker's Configuration Options

Pacemaker
Andrew Beekhof

Configuration Explained

Pacemaker 1.0 Configuration Explained An A-Z guide to Pacemaker's Configuration Options Edition 1
Author Andrew Beekhof andrew@beekhof.net

Copyright © 2009 Andrew Beekhof. The text of and illustrations in this document are licensed under aCreative Commons Attribution– Share Alike 3.0 Unported license ("CC-BY-SA"). An explanation of CC-BY-SA is available at http:// creativecommons.org/licenses/by-sa/3.0/. In accordance with CC-BY-SA, if you distribute this document or an adaptation of it, you must provide the URL for the original version. In addition to the requirements of this license, the following activities are looked upon favorably:1. If you are distributing Open Publication works on hardcopy or CD-ROM, you provide email notification to the authors of your intent to redistribute at least thirty days before your manuscript or media freeze, to give the authors time to provide updated documents. This notification should describe modifications, if any, made to the document. 2. All substantive modifications (including deletions)be either clearly marked up in the document or else described in an attachment to the document. 3. Finally, while it is not mandatory under this license, it is considered good form to offer a free copy of any hardcopy or CD-ROM expression of the author(s) work.

The purpose of this document is to definitively explain the concepts used to configure Pacemaker. To achieve this best, it will focusexclusively on the XML syntax used to configure the CIB. For those that are allergic to XML, Pacemaker comes with a cluster shell and a Python based GUI 1 exists, however these tools will not be covered at all in this document , precisely because they hide the XML. Additionally, this document is NOT a step-by-step how-to guide for configuring a specific clustering scenario. Although such guidesexist, the purpose of this document is to provide an understanding of the building blocks that can be used to construct any type of Pacemaker cluster.

It is hoped however, that having understood the concepts explained here, that the functionality of these tools will also be more readily understood.

Table of Contents
Preface xiii 1. Document Conventions................................................................................................. xiii 1.1. Typographic Conventions .................................................................................... xiii 1.2. Pull-quote Conventions ....................................................................................... xv 1.3. Notes and Warnings........................................................................................... xv 2. We Need Feedback! ..................................................................................................... xvi 1. Read-Me-First 1.1. The Scope of this Document ....................................................................................... 1.2. What Is Pacemaker?.................................................................................................... 1.3. Types of Pacemaker Clusters ....................................................................................... 1.4. Pacemaker Architecture ................................................................................................ 1.4.1. Internal Components .......................................................................................... 1 1 1 2 4 6

2.Configuration Basics 9 2.1. Configuration Layout .................................................................................................... 9 2.2. The Current State of the Cluster ................................................................................. 10 2.3. How Should the Configuration be Updated? ................................................................. 11 2.4. Quickly...
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