HA + LVS + ipvsadm + heartbeat-ldirectord

目的:
1. 用 ipvsadm 作負載平衡
2. 加上 heartbeat-ldirectord 作監控，監控那一台主機掛了剃除服務，ok的就加入服務

ipvsadm for load balance 的網路架構長這樣子

                                                vip=192.168.1.99 (eth0:99)
                                       DR        rip=192.168.1.12 (eth0)
                                        |
                                    ---+-----
                                    |           | 
                                    |           |
                                 RS1       RS2

vip=192.168.1.99 (lo:99)           vip=192.168.1.99 (lo:99)
    rip=192.168.1.13 (eth0)             rip=192.168.1.100 (eth0)

DR server - 也就是 lvs server ，負載控管，分流服務至實體主機

1. 安裝 ipvsadm

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