Apache 2.4/Django: 500 internal server error

[galipany addams]

Hi all,

I am trying to deploy a simple Django project on Apache 2.4.29 (Ubuntu/Debian setup with apache2.conf, etc.). I installed mod_wsgi system-wide via pip3 (version 4.6.7), and the same version is also installed in the virtual environment. Django version 2.2.4, Python 3.6.8.

I have the site in a home/username directory, and a VirtualHost configuration on port 80 in /etc/apache2/sites-available (username.sitename.org below).

My error log looks like this:

/var/log/apache2/error.log:

mod_wsgi (pid=13012, process='username.sitename.org', application='username.sitename.org|'): Loading Python script file '/home/username/cvenv/usernamesite/cssite/wsgi.py'.
[Wed Sep 11 10:10:38.198919 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010] mod_wsgi (pid=13012): Failed to exec Python script file '/home/username/cvenv/usernamesite/cssite/wsgi.py'.
[Wed Sep 11 10:10:38.198954 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010] mod_wsgi (pid=13012): Exception occurred processing WSGI script '/home/username/cvenv/usernamesite/cssite/wsgi.py'.
[Wed Sep 11 10:10:38.199364 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010] Traceback (most recent call last):
[Wed Sep 11 10:10:38.199392 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/home/username/cvenv/usernamesite/cssite/wsgi.py", line 25, in <module>
[Wed Sep 11 10:10:38.199396 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     application = get_wsgi_application()
[Wed Sep 11 10:10:38.199401 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/home/username/cvenv/lib/python3.6/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
[Wed Sep 11 10:10:38.199404 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     django.setup(set_prefix=False)
[Wed Sep 11 10:10:38.199408 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/home/username/cvenv/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
[Wed Sep 11 10:10:38.199410 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     apps.populate(settings.INSTALLED_APPS)
[Wed Sep 11 10:10:38.199414 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/home/username/cvenv/lib/python3.6/site-packages/django/apps/registry.py", line 91, in populate
[Wed Sep 11 10:10:38.199417 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     app_config = AppConfig.create(entry)
[Wed Sep 11 10:10:38.199420 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/home/username/cvenv/lib/python3.6/site-packages/django/apps/config.py", line 90, in create
[Wed Sep 11 10:10:38.199423 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     module = import_module(entry)
[Wed Sep 11 10:10:38.199426 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
[Wed Sep 11 10:10:38.199429 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]     return _bootstrap._gcd_import(name[level:], package, level)
[Wed Sep 11 10:10:38.199439 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "<frozen importlib._bootstrap>", line 994, in _gcd_import
[Wed Sep 11 10:10:38.199443 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "<frozen importlib._bootstrap>", line 971, in _find_and_load
[Wed Sep 11 10:10:38.199446 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010]   File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
[Wed Sep 11 10:10:38.199457 2019] [wsgi:error] [pid 13012:tid 140572140205824] [remote 12.345.678.910:58010] ModuleNotFoundError: No module named 'm'

And my configuration:

/etc/apache2/sites-available/username.sitename.conf:

<VirtualHost *:80>
        DocumentRoot "/home/username/cvenv/usernamesite"
        WSGIScriptAlias / /home/username/cvenv/usernamesite/cssite/wsgi.py
        WSGIDaemonProcess username.sitename.org user=username group=username threads=15 display-name=%{GROUP} python-home=/home/username/cvenv python-path=/home/username/cvenv/usernamesite
        WSGIProcessGroup username.sitename.org
        ServerName username.sitename.org
        ServerAlias username.sitename.org

        <Directory /home/username/cvenv/usernamesite>
        AllowOverride all
        Require all granted
        Options FollowSymLinks
        </Directory>

        Alias /static/ /home/username/cvenv/usernamesite/static/

        <Directory /home/username/cvenv/usernamesite/static>
        Require all granted
        </Directory>

        Alias /media/ /home/username/cvenv/usernamesite/media/

        <Directory /home/username/cvenv/usernamesite/media>
        Require all granted
        </Directory>

</VirtualHost>

My wsgi.py is the Django default.

The error in the log looks to me like something is going wrong with the python version or module version, but I am not sure. Searching for that particular error does not find anything useful...

[Graham Dumpleton]

Looks like in Django configuration you may have provided a string, rather than a list of strings, to something which is meant to be a list of modules that end up being imported.

A string is a sequence, and so if used where a list is required, it will return each character of the string and try and use it. That would explain why trying to import 'm'. That is the first character of the string.

Graham

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