HeartBeat安装
[root@ha ~]# yum -y install heartbeat
安装过程中会报错：
useradd: user hacluster exists
error: %pre(heartbeat-2.1.3-3.el5.centos.i386) scriptlet failed, exit status 9
error: install: %pre scriptlet failed (2), skipping heartbeat-2.1.3-3.el5.centos
退出后，再次执行：
[root@ha ~]# yum -y install heartbeat