centos7系统中如何安装配置keepalived？相信大部分人都还没学会这个技能，为了让大家学会，给大家总结了以下内容，话不多说，一起往下看吧。

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一、基础环境

系统版本	nginx版本	keepalived版本	ip	作用
CentOS Linux release 7.5.1804 (Core)	nginx/1.16.1	keepalived-2.0.18	10.1.1.31	master
CentOS Linux release 7.5.1804 (Core)	nginx/1.16.1	keepalived-2.0.18	10.1.1.32	slave

VIP 10.1.1.111

二、安裝nginx

1. 安裝nignx

   yum install nginx -y

2. 修改nginx配置文件

   • master

     echo 'this is master 31' > /usr/share/nginx/html/index.html

   • slave

     echo 'this is slave 32' >  /usr/share/nginx/html/index.html 

3. 启动nginx

   systemctl start nginx 

4. 测试nginx启动

   curl localhost
   
   this is master

三、安装keepalived

1、 创建依赖环境

yum -y install openssl-devel gcc gcc-c++
mkdir /etc/keepalived
wget https://www.keepalived.org/software/keepalived-2.0.18.tar.gz

2、安装keepalived

tar -zxvf keepalived-2.0.18.tar.gz
mv keepalived-2.0.18 /usr/local/keepalived
cd /usr/local/keepalived
./configure && make && make install

3、创建启动文件

cp  -a /usr/local/etc/keepalived   /etc/init.d/
cp  -a /usr/local/etc/sysconfig/keepalived    /etc/sysconfig/
cp  -a /usr/local/sbin/keepalived    /usr/sbin/

4、创建配置文件

1. master

   cat > /etc/keepalived/keepalived.conf << EOF
   ! Configuration File for keepalived
   global_defs {
          router_id 31
   } 
   vrrp_instance VI_1 {
          state MASTER
          interface ens33
          virtual_router_id 3
          mcast_src_ip 10.1.1.132
          priority 200
          advert_int 1 
          authentication {
                  auth_type PASS
                  auth_pass 123456
          }
          virtual_ipaddress {
                  10.1.1.111/24
          }
   }
   EOF

2. slave

   cat > /etc/keepalived/keepalived.conf << EOF
   ! Configuration File for keepalived
   global_defs {
          router_id 32
   } 
   vrrp_instance VI_1 {
          state BACKUP
          interface ens33
          virtual_router_id 3
          mcast_src_ip 10.1.1.132
          priority 90 
          advert_int 1 
          authentication {
                  auth_type PASS
                  auth_pass 123456
          }
          virtual_ipaddress {
                  10.1.1.111/24
          }
   }
   EOF

5、启动keepalived

systemctl start keepalived
systemctl enable keepalived

四、测试

1、在两台服务器上测试

1. master

   $ curl localhost
   this is master
   root@centos7[14:46:07]:~
   $ curl 10.1.1.111
   this is master
   root@centos7[15:03:29]:~

2. slave

   $ curl localhost
   this is slave
   root@centos7[15:03:59]:/etc/keepalived
   $ curl 10.1.1.111
   this is master

2、关闭master的keepalived模仿down机

1. master关闭keepalived

   $ systemctl stop keepalived 

2. 在slave上面进行测试

$  curl localhost
this is slave
root@centos7[15:10:29]:/etc/keepalived
$ curl 10.1.1.111
this is slave

keepalived完成

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