http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
…
limit_conn_zone $binary_remote_addr zone=conn_zone:1m;
include /etc/nginx/conf.d/*.conf;

server {
    listen       80;
    server_name  localhost1;
    location /mystatus{
      stub_status;
    }

    location / {
       root   /opt/app/code1;
       #random_index on;
       index  index.html index.htm;
       sub_filter 'imooc' 'IMOOC';
       sub_filter_once off;
       limit_conn conn_zone 3;
     #limit_req zone=req_zone burst=3 nodelay;
    }
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

}
重启加载配置之后,ab压力测试 200次请求,10个并发
ab -n 200 -c 10 http://localhost/ 结果如下:
Concurrency Level: 10
Time taken for tests: 0.447 seconds
Complete requests: 200
Failed requests: 0
感觉limit_conn不生效,测试好几遍不知道为啥。