uWSGI, nGinx, and python on Wheezy: how do you configure it?

[Chris Warrick]

On Tue, Dec 16, 2014 at 4:01 PM, Veek M <vek.m1234 at gmail.com> wrote:
> Has anyone got the thing to work? I want to run some python database scripts
> on nginx. Because that will have a simple web-UI, i decided to go with
> uWSGI. It's proving to be a massive pain.
>
> I found a decent book for nginx and got that bit working. The query gets
> sent to uWSGI but for some reason it can't find my script.
>
> Most of the documentation on the web is utterly horrid and will take a 4
> year PhD to understand. I don't undertsand the architecture of uWsgi - he's
> got a bunch of modules and I don't undertsand what exactly is going on
> inside it!
>
> less /etc/nginx/sites-enabled/default
>         location / {
>         include uwsgi_params;
>         uwsgi_pass unix:/run/uwsgi/app/uwsgi/sockete;
>         uwsgi_param UWSGI_PYHOME /usr/share/nginx/cgi;
>         uwsgi_param UWSGI_CHDIR /usr/share/nginx;
>         uwsgi_param UWSGI_SCRIPT index; #NOT SURE WHAT THIS DOES?
>
>
> less /etc/uwsgi/apps-enabled/uwsgi.ini
> [uwsgi]
> plugins=python
> socket=/tmp/uwsgi.socket
> pythonpath=/usr/share/nginx/cgi/
>
> Tue Dec 16 20:43:21 2014 - Python main interpreter initialized at 0x95cde0
> Tue Dec 16 20:43:21 2014 - your server socket listen backlog is limited to
> 100 connections
> Tue Dec 16 20:43:21 2014 - *** Operational MODE: preforking ***
> Tue Dec 16 20:43:21 2014 - added /usr/share/nginx/cgi/ to pythonpath.
> Tue Dec 16 20:43:21 2014 - *** no app loaded. going in full dynamic mode ***
> Tue Dec 16 20:43:21 2014 - *** uWSGI is running in multiple interpreter mode
> ***
> Tue Dec 16 20:43:21 2014 - spawned uWSGI master process (pid: 18792)
> Tue Dec 16 20:43:21 2014 - spawned uWSGI worker 1 (pid: 18818, cores: 1)
> Tue Dec 16 20:43:21 2014 - spawned uWSGI worker 2 (pid: 18819, cores: 1)
>
>
> ::1 - - [16/Dec/2014:21:08:03 +0530] "GET /foo.py HTTP/1.1" 502 172 "-"
> "Mozilla/5.0 (X11; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0"
> --
> https://mail.python.org/mailman/listinfo/python-list

This is NOT how uwsgi works!  You cannot use plain .py files with it,
and for good reason — CGI should be long dead.

What you need to do is, you must write a webapp — in Flask, for
example.  Then you must craft an .ini file that mentions this.

With the http://flask.pocoo.org/ demo as /var/flask/hello.py
(copy-pasting from my working site):

--- nginx config --
location {
    include uwsgi_params;
    uwsgi_pass 127.0.0.1:3031;
}

--- /etc/uwsgi/apps-enabled/hello.ini ---

[uwsgi]
emperor = true
socket = 127.0.0.1:3031
chdir = /var/flask/
master = true
threads = 5
module = %n
callable = app
plugins = python
uid = http
gid = http
processes = 3


--- If /var/flask is a virtualenv, add:

binary-path = /var/flask/bin/uwsgi
virtualenv = /var/flask

-- 
Chris Warrick <https://chriswarrick.com/>
PGP: 5EAAEA16