Nginx 根据来路IP实现灰度发布

如果是内部IP，则反向代理到 pre_prd (预发布环境)；如果不是则反向代理到 prd (生产环境)。 

upstream pre_prd {
    server 192.168.1.200:8080 max_fails=1 fail_timeout=60;
}

upstream prd {
    server 192.168.1.100:8080 max_fails=1 fail_timeout=60;
}

server {
  listen 80;
  server_name  www.linux.com;

  set $env prd;
  if ($remote_addr ~ "114.113.125.186") {
      set $env pre_prd;
  }

location / {                       
    proxy_pass http://$env;
    proxy_set_header   Host             $host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    index  index.html index.htm;
  }
}