haproxy+keepalived群集
本次案列需要搭建两台web服务器，两台haproxy群集调度工具用于调度使web服务器。然后需要在haproxy上部署keepalived实现haproxy双机热备。haproxy用于调度web服务器，keepalived用于实现haproxy的高可用性，两者协调可以使得web群集同时具备这两种性能。
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1、首先准备两台nginx服务器，开启nginx服务。在本地配置地址分别使用192.168.1.10和192.168.1.20，并配置虚拟地址lo:0-192.168.1.111用以作为群集标记。
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另一台nginx服务器配置相同。
2、【搭建haproxy部分】为haproxy配置地址两个地址，一个为192.168.1.30和192.168.1.111（群集地址）；另一个为192.168.1.40和192.168.1.111
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3、使用yum安装pcre-devel和bzip2-devel。
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4、安装haproxy。
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5、建立haproxy配置文件和服务控制文件
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6、编辑haproxy配置文件。vim /etc/haproxy/haproxy.cfg
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7、优化haproxy执行路径，并给与服务控制文件可执行权限。
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8、启动haproxy服务
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9、【安装配置keepalived部分】安装keepalived
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10、添加keepalived系统服务
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11、编辑keepalived配置文件，vim /etc/keepalived/keepalived.conf。（两台keepalived的配置不同，需注意）
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12、启动keepalived服务
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13、在设备上登陆keepalived的virtual_server的ip地址-192.168.1.111
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14、可以通过ip addr show dev eth0查看keepalived漂移地址。
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15、测试。关闭目前的keepalived活跃服务器haproxy1的网卡，可以看到地址会漂移到备份的haproxy2上。
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16、再次登陆该地址192.168.1.111，依然可以访问。
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