利用keepalived实现nginx调度器高可用（一）

利用keepalived实现nginx调度器高可用

声明：提供四台主机，其中两台nginx做前端调度器（一台做主调度器，一台做备用调度器），

另外两台主机做web服务器向外提供http服务；

框架如图：

QQ截图20180615171527.png

1.在两台nginx上配置nginx反代服务

# vim /etc/nginx/nginx.conf

在http上下文中添加下文：

             upstream webser {
       server 172.16.1.12:80 weight=1;
             server 172.16.1.13:80 weight=1;
   }
             server {
       listen       80 default_server;

   location / {
                       proxy_pass http://webser;
       }

}

配置完成后，启动nginx服务，使配置生效；

2.配置keepalived+nginx_master(172.16.1.11主机)：(前提，安装keepalived : # yum install keepalived)

# vim /etc/keepalived/keepalived.conf

              ! Configuration File for keepalived

             global_defs {
           notification_email {
root@localhost
   }
   notification_email_from keepalived@localhost
                 smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id drct1
vrrp_mcast_group4 224.0.100.18
             }
             vrrp_script check_httpd {
      script "killall -0 nginx && exit 0 || exit 1"
                    interval 1
                    weight -20
              }
              vrrp_instance VI_1 {
      state BACKUP
      interface ens33
      virtual_router_id 51
      priority 100
                    advert_int 1
      authentication {
                           auth_type PASS
                           auth_pass cxqLUKJh
                    }
                   virtual_ipaddress {
          172.16.1.254/16
    }
   track_script {
       check_httpd
}
               }

启动keepalived服务：

# systemctl start keepalived.service

3.配置keepalived+nginx_backup(172.16.1.13主机)：

# vim /etc/keepalived/keepalived.conf

              ! Configuration File for keepalived

             global_defs {
           notification_email {
root@localhost
   }
   notification_email_from keepalived@localhost
                 smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id drct2
vrrp_mcast_group4 224.0.100.18
             }
             vrrp_script check_httpd {
      script "killall -0 nginx && exit 0 || exit 1"
                    interval 1
                    weight -20
              }
              vrrp_instance VI_1 {
      state BACKUP
      interface ens33
      virtual_router_id 51
      priority 90
                    advert_int 1
      authentication {
                           auth_type PASS
                           auth_pass cxqLUKJh
                    }
                   virtual_ipaddress {
          172.16.1.254/16
    }
   track_script {
       check_httpd
}
               }

配置完成后，启动keepalived服务：

# systemctl start keepalived

4.配置后端web服务器

1）安装httpd

# yum install http

2) 做web页面：

webserver1:

vim /var/www/html/index.html

Real Server 1

webserver2:

vim /var/www/html/index.html

Real Server 2

3) 启动http服务：

# systemctl start httpd

5.用一个客户端测试：

   # for i in {1..10}; do curl http://172.16.1.254;done
                       Real Server 2
                       Real Server 1
                       Real Server 2
                       Real Server 1
                       Real Server 2
                       Real Server 1
                       Real Server 1
                       Real Server 2
                       Real Server 1
                       Real Server 2

利用keepalived实现nginx调度器高可用（一）

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