使用 nginx 做反向代理

如果公网 ip 很少，而内网需要对外提供服务的服务器很多，最好的办法就是使用反向代理。大致如下：
首先安装 nginx ：

bash

pkg install nginx

或

bash

cd /usr/ports/www/nginx && make install clean

然后再看看 nginx 的配置。

bash

more nginx.conf

bash

worker_processes  4;

error_log  /var/log/nginx/nginx-error.log  info;

worker_rlimit_nofile 65535;

events {
    worker_connections  65535;
}

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  /var/log/nginx/nginx-access.log  main;

    server_names_hash_bucket_size 128;

    client_header_buffer_size 32k;

    large_client_header_buffers 4 32k;

    # 有时候浏览器提交数据会报错，就是这儿设置的太小了导致的，可以适当调整一下
    # 请求体缓存区大小
client_body_buffer_size    10m;
# 设置上传文件的最大值
    client_max_body_size      300m;

    # 隐藏 nginx 的版本号
    server_tokens off;

    ignore_invalid_headers   on;

    recursive_error_pages    on;

    server_name_in_redirect off;

    fastcgi_intercept_errors on;

    sendfile  on;

    tcp_nopush  on;

    tcp_nodelay    on;

    keepalive_timeout  65;

    # 开启 gzip 压缩输出
    gzip  on;
    gzip_min_length  1k;
    gzip_buffers     4 16k;
    gzip_http_version 1.0;
    gzip_comp_level 2;
    gzip_types   text/plain text/css text/javascript application/json application/javascript application/x-javascript application/xml;

    server {
        listen 80 default;
        listen 8080 default;
        listen 8081 default;
        return 500;
    }

    # 为了使配置文件利于修改和整理，可以按端口或按域名把需要反向代理的服务器整合在一个配置文件中
    include reverse_proxy_80.conf;
    include reverse_proxy_443.conf;
    include reverse_proxy_8080.conf;
    include reverse_proxy_8081.conf;
}

bash

more reverse_proxy_80.conf

bash

server {
    listen       80;
    server_name  www.mydomain.com;
    charset utf-8;
    access_log  /var/log/nginx/www.mydomain.com/access.log  main;
    error_log  /var/log/nginx/www.mydomain.com/error.log  info;
    location / {
        proxy_pass     http://www.mydomain.com;
        proxy_set_header   X-Real-IP $remote_addr;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }
}

然后重启一下 nginx 服务就可以了。

后面的就是在网关上做 NAT 了。