How to configure Nginx to limit the number of connections for IP addresses in a network segment

王林
Release: 2023-05-12 11:07:06
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nginx中的所谓连接数限制,其实是tcp连接,也就是请求方通过三次握手后成功建立的连接状态。nginx一般为我们提供了 ngx_http_limit_conn_module 模块来提供限制连接功能。该模块可以根据定义的键来限制每个键值的连接数,如同一个ip来源的连接数。

ngx_http_limit_conn_module指令解释

syntax:  limit_conn zone number;
default:  —
context:  http, server, location
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该指令描述会话状态存储区域。键的状态中保存了当前连接数,键的值可以是特定变量的任何非空值(空值将不会被考虑)。$variable定义键,zone=name定义区域名称。 常见使用例子:

limit_conn_zone $binary_remote_addr zone=addr:10m;

server {
  location /download/ {
    limit_conn addr 1;
  }
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上面例子表示当请求访问 /download/ 时, 同一时刻只能一个请求连接会成功进行资源下载。

网段限制

常见的limit_conn_zone 配置一般设置 $binary_remote_addr 或 $server_name,进行单一ip或主机级的连接数限制。

但有时候我们希望能对某ip网段进行连接数限制,那我们可以这么做:

http {

... ...

  limit_conn_zone $ip_segment zone=network_segment:10m;

  server {
      ... ...
      set $ip_segment $remote_addr;

      if ( $ip_segment ~ ^(\d+)\.(\d+)\.(\d+)\.(\d+) ) {
        set $ip_segment $1.$2.$3;
      }

      location /download/ {
        limit_conn network_segment 10; 
        #limit_rate 200k;
      }

  }
}
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这样基本能满足nginx对网段内所有ip的连接数做统一的连接数限制了。

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source:yisu.com
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