nginx灰度环境

 1、nginx.conf
     split_clients "${remote_addr}AAA" $request_type {
         25% "abtest";
         * "online";
     }
 2、mobile.vipkid.com.cn.conf
     if ($request_type = "abtest") {
         set $group _abtest;
     }
                 proxy_pass http://mobile_vipkid_com_cn$group;
 upstream mobile_vipkid_com_cn_abtest {
         server 10.0.3.141:8080 weight=10 max_fails=3 fail_timeout=5s;
         server 10.0.4.141:8080 weight=10 max_fails=3 fail_timeout=5s;
    }
 upstream mobile_vipkid_com_cn {
         server 10.0.3.142:8080 weight=10 max_fails=3 fail_timeout=5s;
         server 10.0.4.142:8080 weight=10 max_fails=3 fail_timeout=5s;
    }