如何用Nginx TCP反向代理作mail邮件代理

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1. 背景

新版本nginx有TCP反向代理功能，nginx的mail proxy配置认证又太麻烦，于是就想用TCP反向功能作mail代理。

2. Nginx安装(包括nginx_upstream_check_module)

cd /tmp tar zxf pcre-8.35.tar.gz cd pcre-8.35/ ./configure --prefix=/usr/local/pcre make make install  cd /tmp tar zxf openssl-1.0.2g.tar.gz cd openssl-1.0.2g/ ./config enable-tl***t make make install mv -f /usr/bin/openssl /usr/bin/openssl.old mv -f /usr/include/openssl /usr/include/openssl.old ln -sf /usr/local/ssl/bin/openssl /usr/bin/openssl ln -sf /usr/local/ssl/include/openssl /usr/include/openssl  cd /tmp git clone git@github.com:yaoweibin/nginx_upstream_check_module.git  cd /tmp tar zxf nginx-1.13.4.tar.gz cd nginx-1.13.4/ patch -p1 < ../nginx_upstream_check_module/check_1.12.1+.patch ./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-stream=dynamic --with-stream_ssl_module --with-pcre=../pcre-8.35 --with-http_ssl_module --with-openssl=../openssl-1.0.2g --add-module=../nginx_upstream_check_module make make install

3. Nginx配置

cat nginx.conf  user  www; worker_processes  8;  error_log  logs/info.log  info;  #pid        logs/nginx.pid;  load_module modules/ngx_stream_module.so;  # 此处要添加模块  events {     worker_connections  1024; }  http {     include       mime.types;     default_type  application/octet-stream;      #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '     #                  '$status $body_bytes_sent "$http_referer" '     #                  '"$http_user_agent" "$http_x_forwarded_for"';      #access_log  logs/access.log  main;      sendfile        on;     #tcp_nopush     on;      #keepalive_timeout  0;     keepalive_timeout  65;      #gzip  on;      #设定请求缓冲       server_names_hash_bucket_size 128;       client_header_buffer_size 32k;       large_client_header_buffers 4 32k;       client_max_body_size 300m;       #sendfile on;       tcp_nopush     on;       #keepalive_timeout 60;       tcp_nodelay on;       server_tokens off;       client_body_buffer_size 512k;       proxy_connect_timeout   20;       proxy_send_timeout      60;       proxy_read_timeout      20;       proxy_buffer_size       16k;       proxy_buffers           4 64k;       proxy_busy_buffers_size 128k;       proxy_temp_file_write_size 128k;        client_header_timeout  3m;       client_body_timeout    3m;       send_timeout           3m;         gzip on;#开启gzip，节省带宽       gzip_min_length  1100;       gzip_buffers     4 8k;       gzip_types       text/plain text/css application/x-javascript image/bmp application/javascript;           output_buffers   1 32k;       postpone_output  1460;        limit_rate_after 3m;#限速模块，前3M下载时不限速       limit_rate 512k; #限速模块      include vhost/*.conf;  }  stream { include stream/*.conf; } cat stream/mail_pro.conf  ######### TCP 反向代理负载均衡设置 ############### upstream mailsmtp_pro {         server smtp.mxhichina.com:25; }  server {         listen 25; # 对外提供服务TCP监听         proxy_connect_timeout 5s;         proxy_timeout 5s;         proxy_pass mailsmtp_pro; }

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