How to use Nginx_geo module to implement CDN scheduling

Introducing the geo module of nginx

The geo instruction is provided by the ngx_http_geo_module module. By default, nginx loads this module unless --without-http_geo_module is configured manually.

ngx_http_geo_module module can be used to create variables whose values ​​depend on the client ip address. The usage is as follows:

geo指令
语法: geo [$address] $variable { ... }
默认值: —
配置段: http

Define to obtain the client's IP address 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.

在/usr/local/nginx/conf/nginx.conf文件内加入以下配置
geo $geo {
    ranges;          #使用以地址段的形式定义地址，这个参数必须放在首位   
    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;
    }
}

Add the ip_geo.conf file under the /usr/local/nginx/conf/ file to divide the ip area. Note that there should be no IP overlap when dividing, otherwise "overlaps" errors will appear.

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;

You can also segment IP in the form of 10.2.0.0/16 wuhan; so that you don’t need to use the range directive to define it in nginx.conf

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