Do you have multiple Python 3 versions installed on your system?
It may be picking up wrong shared library at run time:
http://modwsgi.readthedocs.io/en/develop/user-guides/checking-your-installation.html#python-shared-library
<http://modwsgi.readthedocs.io/en/develop/user-guides/checking-your-installation.html#python-shared-library>
The solution to that if it is the case, is to work out where the shared library
is for the main Python installation of version you want to use is, and set the
LD_RUN_PATH environment at the time of compilation to where that directory is.
For example, if Python 3 you want to use is under /usr/local, use:
make distclean
./configure --with-apxs=/usr/bin/apxs --with-python=/usr/local/bin/python3
LD_RUN_PATH=/usr/local/lib make
sudo make install
BTW, are you using Anaconda Python?
Did you use virtualenv or pyvenv to create the Python virtual environment.
The pyvenv approach is broken for when embedding Python. I had a workaround for
it, but is possible some recent changes I made so that Anaconda Python would
work has upset that. Or the workaround will not work for Anaconda Python anyway.
Graham
> On 20 Oct 2016, at 11:44 AM, Shanti Suresh <[email protected]> wrote:
>
> Hi Graham,
>
> Thanks so much for your response.
>
> With those changes, I get:
>
> Fatal Python error: Py_Initialize: Unable to get the locale encoding
> ImportError: No module named 'encodings'
>
> I also removed "lang='en_US.UTF-8' locale='en_US.UTF-8’" just for fun, but I
> still get the error about encodings.
> I don't have an "encodings" module in my Django project.
>
> Thanks again,
>
> -Shanti
>
> On Wednesday, October 19, 2016 at 8:15:32 PM UTC-4, Graham Dumpleton wrote:
>
>> On 20 Oct 2016, at 10:56 AM, Shanti Suresh <[email protected] <>> wrote:
>>
>> Greetings,
>>
>> Thank you for your help, in advance! It has been a frustrating day.
>>
>> I have a virtualenv configured with Python3.4.3 on RedHat release 7.2.
>>
>> I configured mod_wsgi-3.4 as:
>> ./configure --with-apxs=/usr/bin/apxs
>> --with-python=/usr/local/dev/env/bin/python3
>
> Are you using your own Python installation or that from the Software
> Collections Library? I am presuming it is your own rather than SCL as SCL
> latest is Python 3.4.2. Just want to make sure.
>
> Anyway, even if you intend to use a virtual environment, it is often better
> to still compile mod_wsgi against the main Python installation. This will
> avoid complications if later want to have multiple daemon process groups
> using different Python virtual environments.
>
> So would recommend doing a:
>
> make distclean
>
> then rerun configure but this time use the python3 from where it was
> originally installed.
>
>> make
>> sudo cp .libs/mod_wsgi.so /etc/httpd/modules/
>>
>> --
>> My wsgi.py file reads:
>> import os
>> os.environ.setdefault("DJANGO_SETTINGS_MODULE",
>> "knack_djangoapp.settings_temp")
>>
>> from django.core.wsgi import get_wsgi_application
>> application = get_wsgi_application()
>> --
>> --
>> In httpd.conf, I have:
>
> Because best practice is to always use daemon mode, I would recommend adding
> outside of VirtualHost, usually just after where the wsgi_module is loaded:
>
> WSGIRestrictEmbedded On
>
> This will prevent Python being initialised in the Apache child worker
> processes and will only be initialised in daemon processes.
>
> If your configuration isn’t quite right and for some reason it tries to run
> stuff in embedded mode, you will now get an error saying something is wrong.
> Thus helps to avoid mistakes.
>
>> <VirtualHost *:81>
>> DocumentRoot /var/www/html/dev
>> ServerName dev.domain.edu <http://dev.domain.edu/>
>> WSGIDaemonProcess dev
>> python-path=/usr/local//dev/djangoapp:/usr/local/dev/env/lib/python3.4/site-packages/
>> lang='en_US.UTF-8' locale='en_US.UTF-8’
>
> Recommend using:
>
> WSGIDaemonProcess dev python-home=/usr/local/dev/env
> python-path=/usr/local//dev/djangoapp lang='en_US.UTF-8' locale='en_US.UTF-8’
> WSGIApplicationGroup %{GLOBAL}
>
> The important bit here is using python-home to set the location of the
> virtual environment. This will be what sys.prefix is set to for Python when
> run under the virtual environment. Don’t set up the virtual environment using
> site-packages in python-path.
>
> The WSGIApplicationGroup is also good practice if only have one application
> per daemon process group, as is recommended, as avoids problems with some
> third party C extensions for Python that will not work in Python sub
> interpreters.
>
>> WSGIProcessGroup dev
>
> This is actually redundant as as process-group option on WSGIScriptAlias.
>
>> WSGIScriptAlias / /usr/local/dev/djangoapp/wsgi.py process-group=dev
>> <Directory /usr/local/dev/djangoapp/>
>> <Files wsgi.py>
>> Require all granted
>> </Files>
>> </Directory>
>> </VirtualHost>
>> --
>>
>> --
>> In my vrtualenv:
>> pip freeze gives:
>> Django==1.8.15
>> mod-wsgi==4.5.7
>> --
>>
>> Upon starting httpd as /sbin/service httpd start, I get:
>> ...Adding '/usr/local/dev/env/lib/python3.4/site-packages/' to path
>> ...Target WSGI script '/usr/local/dev/djangoapp/wsgi.py' cannot be loaded as
>> Python module.
>> ...Exception occurred processing WSGI script
>> '/usr/local/dev/djangoapp/wsgi.py'
>> ...from django.core.wsgi import get_wsgi_application
>> ...ImportError: No module named 'django'
>>
>> I greatly appreciate any and all help. I am at my wits' end. mod_wsgi
>> seems to be using the system python interpreter. It is not using the
>> virtualenv appropriately.
>
> So those are things I would recommend, but how you had it should still have
> worked.
>
> What I would suggest is temporarily replace the wsgi.py file with test script
> in:
>
>
> http://modwsgi.readthedocs.io/en/develop/user-guides/checking-your-installation.html#python-installation-in-use
>
> <http://modwsgi.readthedocs.io/en/develop/user-guides/checking-your-installation.html#python-installation-in-use>
>
> This will log some details about the Python virtual environment being used.
> You can then verify is the virtual environment you expect it to be.
>
> Other things to check are that the user that Apache run as has access to
> everything in the virtual environment. That would usually mean access to
> ‘others’ for files and directories.
>
> The only other thing can think of is that SELinux is causing problems, but
> doubt that as it wouldn’t be able to access the wsgi.py even if that was the
> case.
>
> So try that test WSGI script to see if correct virtual environment. Also in
> Python from command line do:
>
> import django
> print(django.__file__)
>
> and see if where Django actually is, corresponds to where you expect it to
> and where mod_wsgi is looking. Modify the test script to print out the value
> of sys.path to see if the directory is in the module search path if necessary.
>
> Graham
>
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