I'm trying to get a Flask app running on AWS EC2 (standard Ubuntu AMI) through an Apache2 Webserver. My app internally uses Numpy. I have tested the following:
Without Numpy, the App runs through Apache2. With Numpy, it trips on the import numpy
and throws a 500 Server error (See logs below).
With Numpy, the app runs fine when invoked directly from the command line (i.e. python app.py
). The numpy bits work as expected and I can query app endpoints externally.
I also printed the system path (print sys.path
) just before the import numpy as np
and made sure that the appropriate site-packages directory is in the path. I also manually specified the WSGIPythonPath
to include the site-packages directory. I tried setting the number of threads to 1 and editing the apache2.conf file. None of these efforts have been successful.
Below is my directory structure and contents of the relevant files.
Root folder /var/www/html/webserver_mockup
Root folder contents
/var/www/html/webserver_mockup/app.wsgi
/var/www/html/webserver_mockup/mockup/__init__.py
/var/www/html/webserver_mockup/mockup/app.py
#!/usr/bin/python
import sys
import site
site.addsitedir('/home/ubuntu/.local/lib/python2.7/site-packages')
sys.path.insert(0, "/var/www/html/webserver_mockup")
from mockup.app import app as application
WSGIPythonPath /usr/local/lib/python2.7/site-packages/
<VirtualHost *:80>
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
WSGIDaemonProcess webserver_mockup threads=5
WSGIScriptAlias / /var/www/html/webserver_mockup/app.wsgi
<Directory />
WSGIProcessGroup %{GLOBAL}
WSGIApplicationGroup %{GLOBAL}
Order allow,deny
Allow from all
</Directory>
LogLevel warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
[Fri Apr 07 04:09:41.062282 2017] [mpm_event:notice] [pid 7221:tid
140325391972224] AH00489: Apache/2.4.18 (Ubuntu) mod_wsgi/4.3.0
Python/2.7.12 configured -- resuming normal operations
[Fri Apr 07 04:09:41.062358 2017] [core:notice] [pid 7221:tid
140325391972224] AH00094: Command line: '/usr/sbin/apache2'
[Fri Apr 07 04:09:46.770159 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] mod_wsgi (pid=7225): Target
WSGI script '/var/www/html/webserver_mockup/app.wsgi' cannot
be loaded as Python module.
[Fri Apr 07 04:09:46.770300 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] mod_wsgi (pid=7225):
Exception occurred processing WSGI script
'/var/www/html/webserver_mockup/app.wsgi'.
[Fri Apr 07 04:09:46.770370 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] Traceback (most recent
call last):
[Fri Apr 07 04:09:46.770432 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] File
"/var/www/html/webserver_mockup/app.wsgi", line 7, in <module>
[Fri Apr 07 04:09:46.770534 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] from mockup.app import
app as application
[Fri Apr 07 04:09:46.770612 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] File
"/var/www/html/webserver_mockup/mockup/app.py", line 12, in
<module>
[Fri Apr 07 04:09:46.770693 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] import numpy as np
[Fri Apr 07 04:09:46.770755 2017] [wsgi:error] [pid 7225:tid
140325250004736] [client 24.6.50.183:58332] ImportError: No module
named numpy
My question is: Why is Apache2 not finding Numpy despite the appropriate site-packages being in its path?
This:
site.addsitedir('/home/ubuntu/.local/lib/python2.7/site-packages/numpy')
should have been:
site.addsitedir('/home/ubuntu/.local/lib/python2.7/site-packages')
But the whole way you are setting up Python virtual environments is not best practice anyway. Suggest you read:
Also try and switch to daemon mode, it is better to use daemon mode than embedded mode.
numpy via pip is not installed at /home/ubuntu/.local/lib/python2.7/site-packages but it should be at /home/ubuntu/.local/lib64/python2.7/site-packages or something like that.
Just try add another site.addsitedir in your app.wsgi to that folder should work. Something like this :
site.addsitedir('/home/ubuntu/.local/lib64/python2.7/site-packages')
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