24模拟keepalved vrrp功能，监听主节点，如果主节点不可访问则备节点启动并配置LVS实现接管主节点的资源提供服务（提醒：注意ARP缓存）

[root@lb04 scripts]# cat ha_lv.sh
#!/bin/bash
while true
    do
    check_count=$(nmap 10.0.0.13|grep "Host is up"|wc -l)

    if [ ${check_count} -ne  ]
    then
        sh /server/scripts/lv_manager.sh start
        echo "切换服务器到16从服务器"
            arping -I eth0 -c  -U 10.0.0.13
        sleep
        get_ip=$(ip  a|grep "10.0.0.13/24"|wc -l)

        [ ${get_ip} -eq  ] && echo "切换成功"
    fi

    sleep
done