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启动 nginx 的时候 报错 错误信息如下:

nginx: [emerg] balancing method does not support parameter "backup" in /usr/local/nginx/conf/nginx.conf:40

原因是backup 和 ip_hash 无法同时使用（Ip_hash balancer does not support backup servers and weight）。

#user  nobody;worker_processes  1;#error_log  logs/error.log;#error_log  logs/error.log  notice;#error_log  logs/error.log  info;#pid        logs/nginx.pid;events {    worker_connections  1024;}http {    include       mime.types;    default_type  application/octet-stream;    sendfile        on;	upstream backend {             ip_hash;             server 127.0.0.1:8010;             server 127.0.0.1:8080 max_fail=3 weight=2;             server www.baidu.com backup;     }	    server {        listen       80;        server_name  localhost;        #charset koi8-r;        #access_log  logs/host.access.log  main;      		  location / {            root   /usr/www/tyy/;            index  tyy.html;        }		location /static {            alias   /usr/www/static/;        }		location =/baidu.html {	    proxy_pass http://www.baidu.com;        }        location /tyy/ {	    proxy_pass http://127.0.0.1:8010;        }        #error_page  404              /404.html;        # redirect server error pages to the static page /50x.html        #        error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }    }}