1、先从官方网下载Keepalived，然后登陆Centos系统安装必要的环境：gcc、openssl、pcre。
2、将下载好的软件包拷贝到Centos根目录下。
解压软件包、编译安装：
tar zxvf keepalived-1.2.18.tar.gz
cd keepalived-1.2.18
./configure
make
make install
3、安装完成后配置文件：/usr/local/eth/keepalived/keepalived.conf
主节点：
4、备节点：
5、修改配置，允许绑定未知IP：
/etc/sysctl.conf net.ipv4.ip_nonlocal_bind = 1
sysctl -p
最后复制配置文件到相应的目录：
cp /usr/local/sbin/keepalived /usr/sbin/
cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
cp -r /usr/local/etc/keepalived/ /etc/
重启服务：
service keepalived restart
查看绑定状态：
6、测试，用机器长ping虚拟地址，进行倒换测试：关闭主的keepalived时备用机会接管，这时可能会丢一个包。
