使用Nginx实现UDP反向代理

布满荆棘的人生 2022-06-17 05:11 632阅读 0赞

原文：https://www.hi-linux.com/posts/14615.html?utm\_source=tuicool&utm\_medium=referral

在「[使用Nginx实现TCP反向代理][Nginx_TCP]」一文中讲解了如何实现TCP转发功能。今天讲讲怎样实现UDP的反向代理，Nginx从1.9.13起开始发布`ngx_stream_core_module`模块不仅能支持TCP代理及负载均衡,其实也是支持UDP协议的。

**安装Nginx并启用模块**

`ngx_stream_core_module`这个模块并不会默认启用，需要在编译时通过指定`--with-stream`参数来激活这个模块。

*  编译安装

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      $ yum -y install proc* openssl* pcre*
     
      
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      $ wget http://nginx.org/download/nginx-1.10.3.tar.gz
     
      
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      $ tar zxvf nginx-1.10.3.tar.gz
     
      
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      $ cd nginx-1.10.3
     
      
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      $ ./configure  --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-threads --with-stream --with-stream_ssl_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --with-http_spdy_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
     
      
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      $ make
     
      
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      $ make install
     
      
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*  配置stream模块

UDP负载均衡解决了两个关键点：高可用性和横向扩展。UDP设计是不保证端至端传送数据的，因此需要在客户端软件来处理网络级错误和重传机制。

实例：负载均衡DNS

stream模块必需在nginx.conf中配置

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      $ mv nginx.conf{,.bak}
     
      
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      $ vim  /etc/nginx/nginx.conf
     
      
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      worker_processes auto;
     
      
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      error_log /var/log/nginx_error.log info;
     
      
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      events {
     
      
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          worker_connections  1024;
     
      
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      }
     
      
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      stream {
     
      
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      upstream dns {
     
      
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        server 192.168.0.1:53;
     
      
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        server dns.example.com:53;
     
      
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      }
     
      
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      server {
     
      
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        listen 127.0.0.1:53 udp;
     
      
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        proxy_responses 1;
     
      
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        proxy_timeout 20s;
     
      
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        proxy_pass dns;
     
      
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      }
     
      
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      }
     
      
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**参考文档**

[http://www.google.com][http_www.google.com]  
[http://nginx.org/en/docs/stream/ngx\_stream\_core\_module.html][http_nginx.org_en_docs_stream_ngx_stream_core_module.html]

[Nginx_TCP]: https://www.hi-linux.com/posts/65232.html
[http_www.google.com]: http://www.google.com/
[http_nginx.org_en_docs_stream_ngx_stream_core_module.html]: http://nginx.org/en/docs/stream/ngx_stream_core_module.html