nginx常见502问题的解决

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                      nginx常见502问题的解决
常见502 Bad Gateway出现的原因大致分为两种：
（1）配置错误，nginx的配置路径：/data/www路径错了会报错502
[iyunv@daixuan vhosts]# pwd
/usr/local/nginx/conf/vhosts
[iyunv@daixuan vhosts]# vim test.conf
server
{
    listen 80;
    server_name wwww.test.com;
    index index.html index.htm index.php;
    root /data/www;
    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/tmp/www.sock;
        #fastcgi_pass  127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /data/www$fastcgi_script_name;
    }

（2）资源耗尽

实例：
[iyunv@daixuan vhosts]# cd /usr/local/nginx/conf/vhosts/
[iyunv@daixuan vhosts]# ls
111.conf  default.conf
[iyunv@daixuan vhosts]# mv 111.conf test.conf
[iyunv@daixuan vhosts]# vim !$
vim test.conf
红色为修改内容：
server
{
    listen 80;
    server_name wwww.test.com;
    index index.html index.htm index.php;
    root /data/www;

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/tmp/www.sock;
        #fastcgi_pass  127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /data/www$fastcgi_script_name;
    }
}
检查配置文件：
[iyunv@daixuan vhosts]# /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
重新加载，两种方法都可以：
[iyunv@daixuan vhosts]# /usr/local/nginx/sbin/nginx -s reload
[iyunv@daixuan vhosts]# /etc/init.d/nginx reload
重新载入 Nginx：                                           [确定]
在浏览器中访问：www.test.com报错502.

[iyunv@daixuan vhosts]# cat /usr/local/nginx/logs/nginx_error.log
[iyunv@daixuan vhosts]# ls -l /tmp/www.sock
srw-rw---- 1 root root 0 1月   6 20:41 /tmp/www.sock
[iyunv@daixuan vhosts]# ps aux | grep nginx
root      5058  0.0  0.0   5220  1428 ?        Ss   18:49   0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody    5811  0.0  0.1   6472  2416 ?        S    20:58   0:00 nginx: worker process
nobody    5812  0.0  0.1   6472  2236 ?        S    20:58   0:00 nginx: worker process
root      5860  0.0  0.0   6052   796 pts/0    S+   21:04   0:00 grep nginx

解决方法：在www池中添加监听用户和用户组
[iyunv@daixuan vhosts]# vim /usr/local/php/etc/php-fpm.conf
listen.owner= nobody
listen.group = nobody
[iyunv@daixuan vhosts]# /etc/init.d/php-fpm restart
Gracefully shutting down php-fpm . done
Starting php-fpm  done

主机hosts 192.168.101.230 www.test.com
在浏览器中可以正常访问。