linux下lvs+keepalived安装配置
keepalived主机：192.168.174.129keepalived备机：192.168.174.130
realserver1:192.168.174.128（nginx服务器，首页为hello world）
realserver2:192.168.174.133（nginx服务器，首页为nginx默认首页）
VIP：192.168.174.222
LVS模式：DR
防火墙iptables处于关闭状态，selinux为disabled
安装lvs：可以直接使用本地yum安装
yum -y install ipvsadm
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安装keepalived：
下载keepalived源码安装包并解压
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进入keepalived解压目录，执行
./configure --prefix=/usr/local/keepalived
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编译配置完成后，执行make && make install
拷贝keepalived启动文件到/etc/init.d/下，网上教程有的从安装目录下拷贝过来的，我在安装目录下没有找到相关文件
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执行,对于这两步不太了解
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
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cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
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新建文件夹/etc/keepalived
mkdir /etc/keepalived
将keepalived的配置文件拷贝过来，keepalived启动时会从/etc/keepalived目录下查找keepalived.conf配置文件，如果没有找到则使用默认的配置。
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
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以上操作在keepalived主机和从机上皆操作
修改主机配置文件
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修改备机配置文件
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主机和备机配置文件只有router_id和vrrp_instance的state和priority不同
修改/etc/hosts文件，将两台realserver加入进来
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打开主机和备机的路由交换功能
echo 1 >/proc/sys/net/ipv4/ip_forward
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启动主机和备机上的keepalived服务
service keepalived start
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查看虚拟ip状态
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在两台realserver上建立脚本文件，每台一个，内容一样，主要作用是绑定虚拟ip到环回接口
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执行脚本/opt/script/lvs_real.sh start
查看ip状态
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注意lo:0，绑定成功
在本地浏览器访问虚拟ip192.168.174.222，成功
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查看主机上的虚拟ip状态
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在主机上停掉keepalived主机的keepalived服务
killall keepalived
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本地浏览器再次访问虚拟ip，发现正常访问
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查看备机上的虚拟ip状态，发现成功漂移过来
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成功
停掉realserver2的nginx服务，再次访问虚拟ip，可以发现显示的是realsever1的内容，我的realserver1和realserver2为了便于区分首页有一点不同
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