做HA實驗時，啟動heartbeat出現錯誤：
ERROR: Client child command [/usr/lib/heartbeat/ipfail] is not executable
ERROR: Heartbeat not started: configuration error.
ERROR: Configuration error, heartbeat not started.
因為Linux是64位的，ha.cf 配置文件裡
/usr/lib/heartbeat/ipfail 這一句要改為：
/usr/lib64/heartbeat/ipfail
再次啟動/etc/init.d/heartbeat start
Starting High-Availability services: INFO: Resource is stopped
Done.
成功
