一、条件

      （1）需要两台Nginx服务器

      （2）需要keepalived

      （3）需要虚拟ip

二、准备工作

      （1）需要两台服务器

      （2）在两台服务器安装nginx

      （3）在两台服务器安装keepalived(如下使用yum安装)

cd /usr
yun install keepalived -y
rpm -q -a keepalived

        安装之后在 /etc目录下有keepalived的配置文件 keepalived/keepalived.conf

三、完成高可用配置（主从配置）

    （1）修改/etc/keepalived/kepalived.conf配置文件

    （2）在/ust/local/nginx下添加检测脚本nginx_check.sh

    （3）把两台服务器上的nginx和keepalived启动

keepalived: 

systemctl start keepalived.server
ps -ef | grep keepalived

四、最终测试

（1）在浏览器地址栏输入虚拟ip地址

ip a

（2）把主服务器nginx和keepalived停止，再次输入

systemctl stop keepalived.server

附：keepalived配置文件主要参数解释