v2版本是可以兼容v1的配置文件，而v2提供了更加强大的集群控制功能。使用v1还是v2的配置文件，是以ha.cf主配置文件决定的。实际使用中，虽然v2功能强大，但配置比较麻烦，GUI图形工具更是复杂难用，似乎要完全弄懂并不容易。不过，要实现基础的配置却是比较简单的，官方也提供了大量的说明文档，建议大家对比来看。

 High availability refers to the practice of keeping online resources available through node failure or system maintenance. This guide will demonstrate a method for using two Linodes to keep a website online, even when the node initially hosting it is powered off. IP failover, Heartbeat 3.0,Pacemaker 1.1, DRBD (Distributed Replicated Block Device), MySQL and Apache 2.2 will be used for this example configuration.

As high availability is a complex topic with many methods available for achieving various goals, it should be noted that the method discussed here may not be appropriate for some use cases. However, it should provide a good foundation for developing a customized HA solution.

Introduction

Openfiler is a high performance operating system tailored for use as a SAN/NAS appliance. This configuration will enable two Openfiler appliances to work in an Active/Passive high availability scenario. 

Install

This guide shows how you can set up a two node, high-availability HTTP cluster with heartbeat on CentOS. Both nodes use the Apache web server to serve the same content.

Installing Heartbeat (Newbie)

If you're just getting started with heartbeat, this screencast gives a quick tour of installing heartbeat and getting it up and running.

This screencast takes about 10 minutes to view (and listen to). HINT: turn on your speakers or headphones.

来源：http://bbs.linuxtone.org/thread-1507-1-1.html

Linux下高可用集群方案很多，本文介绍的是性价比比较高的一种:
使用Heartbeat 2.0配置Linux高可用性集群。