nginx 负载均衡 出现问题，两个服务端同时运行。

[牛牛大神]

我想用nginx的负载功能，配置了两个服务端，结果在网页上访问时，两个tomcat同时被访问了，请问是不是我的配置有问题啊？

nginx.conf配置内容：

worker_processes 1;

events {
worker_connections 1024;
}


http {
include mime.types;
default_type application/octet-stream;

upstream ann {
ip_hash;
server 127.0.0.1:8080 weight=10;
server 127.0.0.1:8081;
}

sendfile on;
keepalive_timeout 65;


server {
listen 6888;
server_name localhost;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {
proxy_connect_timeout 300s;
proxy_send_timeout 300s;
proxy_read_timeout 300s;

proxy_set_header Host $host:$server_port;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_buffering off;

proxy_pass http://ann;
}

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}