實驗拓撲

實驗要求

1. 兩個web server提供httpd服務，ip地址分別是172.18.27.201、202，掩碼是16
2. 兩個nginx proxy提供高可用反向代理，ip地址分別是172.18.27.102、200，掩碼是16.
3. client能夠訪問web server，使用dr模型反向代理。

實驗步驟

1. 各主機安裝軟件

   ##web server安裝httpd
   yum install -y httpd
   ##nginx proxy安裝nginx和keeplived.
   yum install -y keepalived nginx

2. 配置web server

   ##兩臺web server配置,兩臺都為centos7.2
   #RS1配置
   vim /var/www/html/index.html
   <h1/>RS1:172.18.27.201</h1>
   #RS2配置
   vim /var/www/html/index.html
   <h1/>RS2:172.18.27.202</h1>
   #RS1和RS2啟動httpd服務
   systemct start httpd
3. 配置nginx proxy

   ##配置nginx proxy服務器
   #配置nginx upstream
   vim /etc/nginx/nginx.conf
   http {
        .....
     upstream httpdserver{
        server 172.18.27.201:80 weight=2;
        server 172.18.27.202:80 weight=1;
        server 127.0.0.1:8080 backup;
    }
   }
   #配置keeplived
   vim /etc/keepalived/keepalived.conf
   global_defs {
   vrrp_mcast_group4 224.100.27.1
   }
   vrrp_script chk_down {
                script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
                interval 1
                weight -5
                        }
   vrrp_script chk_nginx {
                script "killall -0 nginx && exit 0 || exit 1"
                interval 1
                weight -5
                fall 2
                rise 1
   }
   vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 51
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.18.27.254/16 dev eth1 label eth1:0
    }
    track_script {
        chk_down
        chk_nginx
    }
    track_interface{
        eth1
    }
   }
   #啟動服務
   service nginx start
   service keepalived start

   配置另一臺nginx proxy

   #配置nginx upstream
   vim /etc/nginx/nginx.conf
   http {
        .....
     upstream httpdserver{
        server 172.18.27.201:80 weight=2;
        server 172.18.27.202:80 weight=1;
        server 127.0.0.1:8080 backup;
    }
   }
   #配置keeplived
   vim /etc/keepalived/keepalived.conf
   global_defs {
   vrrp_mcast_group4 224.100.27.1
   }
   vrrp_script chk_down {
                script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
                interval 1
                weight -5
                        }
   vrrp_script chk_nginx {
                script "killall -0 nginx && exit 0 || exit 1"
                interval 1
                weight -5
                fall 2
                rise 1
   }
   vrrp_instance VI_1 {
    state BACKUP
    interface eno16777736
    virtual_router_id 51
    priority 98
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.18.27.254/16 dev een016777736 label eno16777736:0
    }
    track_script {
        chk_down
        chk_nginx
    }
    track_interface{
        eno16777736
    }
   }
   #啟動服務
   systemctl start nginx keepalived

   試驗效果

   正常狀態

   

   一個web server 宕機了

   

   一個nginx proxy服務器宕機了

   
   
   能夠正常運行

keepalived+nginx-upstream部署高可用反向代理