多台图片服务器下 nginx 自动匹配图片

需求：有图片服务器，A、B、C、D，由于某种原因，读取图片时，不知道图片在哪台机器上。所以用 nginx 来判断图片在哪台机器上。

upstream test.com {      server t2.com:80;      server t3.com:80;      server t4.com:80;  }  server {      listen       80;      server_name  test.com;      root /var/www/test.com;      access_log  logs/test.log  main;        location / {          try_files $uri @proxy;      }      location @proxy {          proxy_next_upstream http_502 http_504 http_404 error timeout invalid_header;          proxy_pass http://test.com;          proxy_set_header X-Real-IP  $remote_addr;          proxy_set_header X-Forwarded-For $remote_addr;      }  }  

参考资料

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream

原文出处：41ms -> https://www.41ms.com/archive/20171012.html