mod_wsgi setup

[tino]

Hello,

I am trying to setup a python 2.7 + Django + virtualenv + mod_wsgi environment in my centos 6.3 server to run my python application through apache.

But I am getting internal error while trying to access the application through apache. The error log shows the following.

============

[Fri Nov 15 04:20:30 2013] [error] [client 117.201.194.54] mod_wsgi (pid=20361): Target WSGI script '/var/www/html/djangosites/spark.wsgi' cannot be loaded as Python module.

[Fri Nov 15 04:20:30 2013] [error] [client 117.201.194.54] mod_wsgi (pid=20361): Exception occurred processing WSGI script '/var/www/html/djangosites/spark.wsgi'.

Fri Nov 15 04:20:30 2013] [error] [client 117.201.194.54] ImproperlyConfigured: Requested setting DEBUG, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

============

It is working fine when running as a test server.

======

(virtualenv)[root@lampserver spark]# python manage.py runserver 0.0.0.0:8080

Validating models...

0 errors found

November 15, 2013 - 09:15:19

Django version 1.6, using settings 'spark.settings'

Starting development server at http://0.0.0.0:8080/

Quit the server with CONTROL-C.

====

spark.wsgi file looks like the following.

===========

 import sys

import site

import os

vepath = '/var/www/html/virtualenv/lib/python2.7/site-packages'

prev_sys_path = list(sys.path)

site.addsitedir(vepath)

sys.path.append('/var/www/html/djangosites')

new_sys_path = [p for p in sys.path if p not in prev_sys_path]

for item in new_sys_path:

    sys.path.remove(item)

sys.path[:0] = new_sys_path

from django.core.handlers.wsgi import WSGIHandler

os.environ['DJANGO_SETTINGS_MODULE'] = 'spark.settings'

application = WSGIHandler()

==============

Entries for wsgi in apache conf looks like the following

============

[root@lampserver djangosites]# cat /etc/httpd/conf.d/django.conf 

LoadModule wsgi_module modules/mod_wsgi.so

AddHandler wsgi-script .wsgi

WSGIScriptAlias / /var/www/html/djangosites/spark.wsgi

WSGIDaemonProcess spark processes=5 threads=15 display-name=%{GROUP}

WSGIProcessGroup spark

WSGIApplicationGroup %{GLOBAL}

WSGISocketPrefix /var/run/wsgi

=================

Apache is running as user "apache".

My project files and permissions are shown below.

===========

root@lampserver djangosites]# pwd

var/www/html/djangosites

[root@lampserver djangosites]# ls

spark  spark.wsgi

[root@lampserver djangosites]# ll

total 8

drwxr-xr-x 3 apache apache 4096 Nov 15 02:38 spark

-rwxrwxrwx 1 apache apache  535 Nov 15 03:16 spark.wsgi

[root@lampserver djangosites]# cd spark/

manage.py  spark/     

[root@lampserver spark]# ll

total 8

-rwxr-xr-x 1 apache apache  248 Nov 15 02:38 manage.py

drwxr-xr-x 2 apache apache 4096 Nov 15 03:05 spark

[root@lampserver spark]# cd spark/

[root@lampserver spark]# ll

total 28

-rw-r--r-- 1 apache apache    0 Nov 15 02:38 __init__.py

-rw-r--r-- 1 apache apache  136 Nov 15 02:40 __init__.pyc

-rw-r--r-- 1 apache apache 1969 Nov 15 02:38 settings.py

-rw-r--r-- 1 apache apache 2142 Nov 15 02:40 settings.pyc

-rw-r--r-- 1 apache apache  296 Nov 15 02:38 urls.py

-rw-r--r-- 1 apache apache  416 Nov 15 02:40 urls.pyc

-rwxr-xr-x 1 apache apache  385 Nov 15 02:38 wsgi.py

-rw-r--r-- 1 apache apache  589 Nov 15 02:40 wsgi.pyc

==================

Can anybody please identify the problem with my settings?

Regards

[Liam Thompson]

The "Requested setting DEBUG" says you've requested DEBUG but it's not setup. I don't think you would want DEBUG in production, so try to turn that off in the settings file.

[Timothy W. Cook]

On centos 6 I had (still have) problems similar to this due to SELinux
restricting Apache from accessing the application. Even after
rechecking permissions SELinux doesn't want to allow a user to access
another users (specifically setup for the application) home
directory. You can test if this is the same problem by disabling
SELinux temporarily with:

$setenforce 0

This is really a temporary fix and exploring
http://www.crypt.gen.nz/selinux/disable_selinux.html may help.

HTH,
Tim

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[Timothy W. Cook]

BTW: HEre is an old tutorial regarding SELinux and WSGI apps. It may
be useful?
http://www.packtpub.com/article/selinux-secured-web-hosting-python-based-web-applications

[tino]

Thank you guys for the suggestions.

But selinux is already disabled in the server.

 [root@lampserver spark]# getenforce 

Disabled

Also I tried to set 

 DEBUG = False  in settings.py. That also did not help.

[Fred Stluka]

tino,

I have a working setup, using Apache mod_wsgi on AWS Linux.

Try adding the location of your virtual env to to your Apache settings.
Something like:

======================

WSGIPythonHome /var/python27/virtualenvs/hhl

======================

If that doesn't help, here are some more thoughts.

My django.wsgi file looks similar to yours.  Differences in red:

======================

import os, sys
sys.path.append('/var/www/django/hhlweb')
sys.path.append('/var/www/django/hhlweb/hhl')
sys.path.append('/var/python27/virtualenvs/hhl/lib/python2.7/site-packages/django/db/backends')
os.environ['DJANGO_SETTINGS_MODULE'] = 'hhl.settings'
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

======================

What does your wsgi.py file look like?  Mine is:

======================

import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "hhl.settings")
from django.core.wsgi import get_wsgi_application
application = get_wsgi_application()

======================

I found these links useful when I set mine up last year:
- http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide
- http://code.google.com/p/modwsgi/wiki/ConfigurationIssues
- https://docs.djangoproject.com/en/dev/howto/deployment/wsgi/modwsgi

--Fred

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[tino]

Thank you Fred for your help.

Finally I got it working. I tried different things and this is how my files looks  now.

spark.wsgi

=================

import os

import sys

sys.stdout = sys.stderr

# Add the virtual Python environment site-packages directory to the path

import site

site.addsitedir('/var/www/html/virtualenv/lib/python2.7/site-packages')

#If your project is not on your PYTHONPATH by default you can add the following

sys.path.append('/var/www/html/djangosites/spark')

os.environ['DJANGO_SETTINGS_MODULE'] = 'spark.settings'

import django.core.handlers.wsgi

application = django.core.handlers.wsgi.WSGIHandler()

==========================

Apache entries

==================

WSGIScriptAlias / /var/www/html/djangosites/spark.wsgi

WSGIDaemonProcess spark processes=5 threads=15 display-name=%{GROUP}

WSGIProcessGroup spark

WSGIApplicationGroup %{GLOBAL}

WSGISocketPrefix /var/run/wsgi

====================

On Friday, November 15, 2013 3:04:58 PM UTC+5:30, tino wrote:

[Fred Stluka]

tino,

Didn't need the WSGIPythonHome setting in Apache, eh?
Interesting...

--Fred

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Bristle Software, Inc -- http://bristle.com -- Glad to be of service!
Open Source: Without walls and fences, we need no Windows or Gates.

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