Django Apache2 VirtualEnv - no response from server

Question

So I am trying to migrate my app to a new production server. I'm not getting a reply from the server Apache server when I access it. The server is on AWS and it's a standard Apache config with just one site enabled:

<VirtualHost *:80>
    Alias /static/ /home/ubuntu/myapp/myapp/myapp/static
    Alias /media/ /home/ubuntu/myapp/myapp/myapp/media

    <Directory /home/ubuntu/myapp/myapp/myapp/static>
        Require all granted
    </Directory>

    <Directory /home/ubuntu/myapp/myapp/myapp/media>
                Require all granted
        </Directory>

    <Directory /home/ubuntu/myapp/myapp/myapp>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </Directory>

    WSGIDaemonProcess myapp python-home=/home/ubuntu/myapp/myapp/myapp python-path=/home/ubuntu/myapp:/home/ubuntu/myapp/lib/python3.6/site-packages
    WSGIProcessGroup myapp
    WSGIScriptAlias / /home/ubuntu/myapp/myapp/myapp/myapp/wsgi.py

    ErrorLog /var/log/apache2/myapp_error.log
    LogLevel warn
    CustomLog /var/log/apache2/myapp_access.log combined

</VirtualHost>

I have made sure that all files are owned by the ubuntu user and that www-data has group rights.

The wsgi file is the original, but I added a print statement to see the folder it's checking for the application:

"""
WSGI config for match2 project.

It exposes the WSGI callable as a module-level variable named ``application``.

For more information on this file, see
https://docs.djangoproject.com/en/1.8/howto/deployment/wsgi/
"""

import os, sys

print(sys.path)

from django.core.wsgi import get_wsgi_application

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myapp.settings")

application = get_wsgi_application()

Eventually, the error log will produce:

Timeout when reading response headers from daemon process 'myapp': /home/ubuntu/myapp/myapp/myapp/myapp/wsgi.py

I'd appreciate any advice.

Answer 1

Timeout when reading response headers from daemon process 'myapp' means your application is taking to long to handle the request. This could be because it is deadlocked, or is waiting on backend service.

Add WSGIApplicationGroup to your virtual host configuration.

<VirtualHost *:80>
    # config remaining parts
    WSGIApplicationGroup %{GLOBAL}
    # config remaining parts
</VirtualHost>

From docs

... forces the WSGI application to run in the main Python interpreter context of each process. This is preferred in this scenario as some third party packages for Python which include C extensions will not run in the Python sub interpreter contexts which mod_wsgi would use by default. By using the main Python interpreter context you eliminate the possibility of such third party packages for Python causing problems.

A similar case link.

Also: Looking at this,

python-home=/home/ubuntu/myapp/myapp/myapp python-path=/home/ubuntu/myapp:/home/ubuntu/myapp/lib/python3.6/site-packages

I think you have the wrong path for python-home. Make sure python-home path is correctly provided. Activate your virtual environment and run the command to get the python-home path [docs].

python -c 'import sys; print(sys.prefix)'