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;
   }