The Nginx_geo module is used to implement the configuration method of CDN scheduling

The Geo module of Nginx is introduced

The geo directive is provided using the ngx_http_geo_module module. By default, nginx has this module loaded unless manually -- without-http_geo_module.

The ngx_http_geo_module module can be used to create a variable whose value depends on the client IP address. Usage:

geo instruction 
 grammar : geo [$address] $variable { ... }
 The default value :  - 
 Configuration section : http

Defines the IP address of the client from the specified variable. By default, nginx gets the client IP address from the $remote_addr variable, but it can also be obtained from other variables.

 in /usr/local/nginx/conf/nginx.conf Add the following configuration to the file 
geo $geo {
    ranges;          # To define an address in the form of an address segment, this parameter must be in the first place    
    default dn;
    include ip_geo.conf;
  }

    upstream wuhan.server {
      server   192.168.155.98:8081;
    }

    upstream shanghai.server {
      server   192.168.155.98:8082;
    }

    upstream shenzhen.server {
      server   192.168.155.98:8083;
    }

    upstream dn.server {
      server   192.168.155.98:8084;
    }

 server {
    listen    80;
    server_name 192.168.155.98 jiaoyu.media.cloudp.cc;
      root   html;
      index index.html index.htm;
    location ~* \.xml$ {
      root /data/video;
    }
    location / {
      proxy_redirect off;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For 
      $proxy_add_x_forwarded_for;
      proxy_pass http://$geo.server$request_uri;
    }
  }

  server {
    listen 8081;
    server_name 192.168.155.98;
    location / {
      rewrite ^ $scheme://192.168.155.106$request_uri? permanent;
    }
  }

  server {
    listen 8082;
    server_name 192.168.155.98;
    location / {
        rewrite ^ $scheme://192.168.155.107$request_uri? permanent;
    }
  }

server {
    listen 8083;
    server_name 192.168.155.98;
    location / {
        rewrite ^ $scheme://192.168.155.109$request_uri? permanent;
    }
  }

  server {
    listen 8084;
    server_name 192.168.155.98;
    location / {
        rewrite ^ $scheme://jiaoyu.dn.cloudp.cc$request_uri? permanent;
    }
}

In/usr local/nginx/conf/file under increased ip_geo conf files, used for IP area division, pay attention divided cannot appear IP overlap phenomenon, can appear otherwise "overlaps" error

vim /usr/local/nginx/conf/ip_geo.conf

192.168.128.6-192.168.128.10 wuhan;
192.168.128.11-192.168.128.15 shanghai;
192.168.128.16-192.168.128.20 shenzhen;

Also available in 10.2.0.0/16 wuhan; This form is used for IP segmentation, so that in nginx.conf there is no need to use the range directive for definition