如何阻止Cloudflare / Docker / NGINX / LAMP站点中的客户端IP地址丢失？

问题是PHP字段$_SERVER['HTTP_CLIENT_IP']没有在我的以下站点结构中设置，我应该如何解决这个问题？

Docker桥接networking上的静态IP容器（在cloudflare后面的主机上）名为“back”：

  1. 运行在容器中的NGINX（172.24.02）
  2. 容器中的Apache + PHP（172.24.0.3）

nginx.conf： 

 location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_pass http://172.24.0.3; }

test.php的 

 <?php echo('HTTP_CLIENT_IP: '.$_SERVER['HTTP_CLIENT_IP']); echo('<br>HTTP_X_FORWARDE‌​D_FOR'.$_SERVER['HTTP_X_FORWARDE‌​D_FOR']); echo('<br>REMOTE_ADDR'.$_SERVER['REMOTE_ADDR']); echo('<br>HTTP_X_FORWARDED'.$_SERVER['HTTP_X_FORWARDED']); echo('<br>HTTP_FORWARDED'.$_SERVER['HTTP_FORWARDED']); echo('<br>HTTP_FORWARDED_FOR'.$_SERVER['HTTP_FORWARDED_FOR']); ?>

运行以上产量： 

 HTTP_CLIENT_IP: HTTP_X_FORWARDE‌​D_FOR: REMOTE_ADDR: 172.24.0.2 HTTP_X_FORWARDED: HTTP_FORWARDED: HTTP_FORWARDED_FOR:

感谢@Devon提出了打印出$ _SERVERvariables的build议，结果发现以下字段中包含客户端IP： 

 $_SERVER['HTTP_CF_CONNECTING_IP'] $_SERVER['HTTP_X_FORWARDED_FOR']

第一个给client IP ，第二个给client IP, cloudflare IP

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