Flask、nginx 和 uwsgi

Question

我的Flask应用程序如下所示...
myapp.py

from flask import Flask  
app = Flask(__name__) 

@app.route("/")  
def hello():  
   return "Hello World!"  

if __name__ == "__main__":  
   app.run('0.0.0.0')

我的nginx设置

server {
         root /home/admin.jeremylspencer.com;
         server_name admin.jeremylspencer.com;

         location / { try_files $uri @yourapplication; } 
         location @yourapplication {
                 include uwsgi_params;
                 uwsgi_pass unix:/tmp/uwsgi.sock;
         }       

         #error_page 404 /404.html;
         #error_page 500 502 503 504 /50x.html;
         location = /50x.html {
                 root /usr/share/nginx/www;
         }        
         location ~ /\.ht {
                 allow all;
         }
}

最后，我重新启动了nginx，并运行了以下命令：

sudo uwsgi -s /tmp/uwsgi.sock --module myapp --callable app 这是输出结果：

*** Starting uWSGI 1.4.3 (64bit) on [Mon Dec 10 15:41:00 2012] ***
compiled with version: 4.6.3 on 10 December 2012 13:06:15
os: Linux-3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012
nodename: jeremylspencer.com
machine: x86_64
clock source: unix
detected number of CPU cores: 2
current working directory: /home/admin.jeremylspencer.com
detected binary path: /usr/local/bin/uwsgi
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** 
*** WARNING: you are running uWSGI without its master process manager ***
your processes number limit is 31285
your memory page size is 4096 bytes
detected max file descriptor number: 1024
lock engine: pthread robust mutexes
uwsgi socket 0 bound to UNIX address /tmp/uwsgi.sock fd 3
Python version: 2.7.3 (default, Aug  1 2012, 05:25:23)  [GCC 4.6.3]
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x1dfa790
your server socket listen backlog is limited to 100 connections
mapped 72392 bytes (70 KB) for 1 cores
*** Operational MODE: single process ***
WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x1dfa790 pid: 13645 (default app)
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker 1 (and the only) (pid: 13645, cores: 1)

但是我一直收到502错误提示...有什么方法可以修复它吗？

- Jeremy Spencer

Answer 1

Unix sockets是文件系统对象，因此nginx需要对/tmp/uwsgi.sock拥有写权限。

您正在以root用户身份运行uWSGI（为什么？？？），因此/tmp/uwsgi.sock将由root拥有，而nginx通常作为nobody或www-data运行。

如果您不想考虑权限问题，只需使用TCP套接字，但显然不要以root身份运行应用程序。

- roberto

Answer 2

你可以看一下这个链接：Python flask with Nginx and uWSGI，因为该代码库提供了一个确切的案例/场景，展示如何在生产模式下使用Flask。

- illusionx