最近遇到了一个棘手的问题，即在尝试通过uWSGI和nginx运行Python应用程序时，频繁出现权限错误：

-bash-4.1# > /var/log/nginx/error.log

-bash-4.1# curl 127.0.0.1:8080











502 Bad Gateway














nginx/1.6.2







-bash-4.1# cat /var/log/nginx/error.log 

2015/01/16 18:51:32 [crit] 4937#0: *1 connect() to 127.0.0.1:3301 failed (13: Permission denied) while connecting to upstream, client: 127.0.0.1, server: uwsgi_demo, request: "GET / HTTP/1.1", upstream: "uwsgi://127.0.0.1:3301", host: "127.0.0.1:8080"

测试的应用程序代码如下：

def application(env, start_response):
    start_response('200 OK', [('Content-Type','text/html')])
    return ['Hello World']

测试程序所在的目录结构如下所示：

-bash-4.1# ll

total 12

-rw-r--r--. 1 nginx nginx 139 Jan 16 15:34 app.py

-rw-r--r--. 1 root  root  136 Jan 16 18:37 demo.ini

-rw-r-----. 1 root  root   95 Jan 16 18:45 demo.log

uWSGI的配置文件内容为：

[uwsgi]

socket = 127.0.0.1:3031

wsgi-file = app.py



uid = nginx

gid = nginx

chmod-socket = 666



logto = demo.log

stats = 127.0.0.1:9191

nginx的配置如下：

server {

    listen      8080;

    server_name uwsgi_demo;

    location / {

        include uwsgi_params;

        uwsgi_pass 127.0.0.1:3301; 

    }

}

当前运行的进程情况如下：

-bash-4.1# ps aux | grep nginx

nginx     4819  0.0  0.3  53996  6852 pts/4    S+   18:48   0:00 uwsgi26 demo.ini

nginx     4821  0.0  0.3  73460  6048 pts/4    S+   18:48   0:00 uwsgi26 demo.ini

root      4935  0.0  0.1 141788  2568 ?        Ss   18:50   0:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf

nginx     4937  0.0  0.1 142184  3292 ?        S    18:50   0:00 nginx: worker process           

root      4939  0.0  0.0   6380   692 pts/2    S+   18:50   0:00 grep nginx

根据上述信息，此问题可能是由于文件权限设置不当导致的。建议检查所有相关文件和目录的权限设置，确保它们能够被正确的用户（如nginx）访问。此外，也可以尝试调整uWSGI配置中的chmod-socket参数，以确保套接字具有适当的权限。