原文参照

https://gist.github.com/1216602

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# 在本地服务器建立 rubygems.org 的镜像缓存，以提高 gem 的安装速度
# 此配置设置缓存过期为1天，也就是说，新上的 gem 无法马上安装
# 做这个起什么作用？
# rubygems 的很多资源文件是存放到 Amazon S3 上面的，由于 GFW 对某些 S3 服务器又连接重置或丢包，导致 gem 安装异常缓慢或有时候根本无法连接安装。
# 而通过这种跳板的方式可以很好的解决这个问题，当然前提是 Nginx反向代理 服务器需要在国外
proxy_cache_path  /var/cache/rubygems  levels=1:2    keys_zone=RUBYGEMS:10m
                                       inactive=24h  max_size=1g;
server {
  listen 80;
  server_name rubygems.org;
  location / {
    proxy_pass        http://rubygems.org;
    proxy_redirect     off;
    proxy_set_header   Host             $http_host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
  }
}
server {
  listen 80;
  server_name production.cf.rubygems.org;
  location / {
    proxy_pass        http://production.cf.rubygems.org;
    proxy_redirect     off;
    proxy_set_header   Host             $http_host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_cache            RUBYGEMS;
    proxy_cache_valid      200  1d;
    proxy_cache_use_stale  error timeout invalid_header updating
                               http_500 http_502 http_503 http_504;
  }
}
server {
  listen 80;
  server_name production.s3.rubygems.org;
  location / {
    proxy_pass        http://production.s3.rubygems.org;
    proxy_redirect     off;
    proxy_set_header   Host             $http_host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_cache            RUBYGEMS;
    proxy_cache_valid      200  1d;
    proxy_cache_use_stale  error timeout invalid_header updating
                               http_500 http_502 http_503 http_504;
  }
}
server {
  listen       443;
  server_name  rubygems.org;
  location / {
    proxy_pass https://rubygems.org;
    proxy_redirect     off;
    proxy_set_header   Host             $http_host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
  }
  ssl                  on;
  ssl_certificate     /etc/nginx/conf/server.crt;
  ssl_certificate_key  /etc/nginx/conf/server.key;
  ssl_session_timeout  5m;
  ssl_protocols  SSLv2 SSLv3 TLSv1;
  ssl_ciphers  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
  ssl_prefer_server_ciphers   on;
}
50.93.202.* rubygems.org
50.93.202.* production.cf.rubygems.org
50.93.202.* production.s3.rubygems.org
#生成SSl证书, 这个是在centos下的情况 #openssl genrsa -out server.key 2048 #openssl req -new -x509 -key server.key -out server.crt -days 1095