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POWhy doesn't apache load my .so libraries when I try to run my flask application?
 

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  1. POWhy doesn't apache load my .so libraries when I try to run my flask application?
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    <p>I have a developed flask application which runs successfully on flask's embedded server. The application uses a backend written in C++. The libraries for my C++ backend are in this folder:</p> <blockquote> <p>/home/(USER_NAME)/rf/Dev/Backend/lib/libtestCAF.so</p> </blockquote> <p>When I run the application on the embedded server, it finds the C++ backend code and uses it to generate reports. However, when I run the same application on apache, I get this error trace:</p> <pre><code>[Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] from main.main import main [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] File "/home/(USER_NAME)/rf/Dev/Web/main/main.py", line 19, in &lt;module&gt; [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] from CAF.CAFWrapper import * [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] File "/home/admin1/rf/Dev/Web/CAF/CAFWrapper.py", line 12, in &lt;module&gt; [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] lib = cdll.LoadLibrary('../Backend/lib/libtestCAF.so') [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] File "/usr/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] return self._dlltype(name) [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] File "/usr/lib/python2.7/ctypes/__init__.py", line 365, in __init__ [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] self._handle = _dlopen(self._name, mode) [Thu Jul 11 14:44:54 2013] [error] [client 127.0.0.1] OSError: ../Backend/lib/libtestCAF.so: cannot open shared object file: No such file or directory </code></pre> <p>As you can see on that last line, it says that libtestCAF.so doesn't exist. Meanwhile, the embedded server always finds it. </p> <p>I use mod_wsgi to run the flask application on the apache server. The WSGI file I use is in this folder:</p> <pre><code>/home/(USER_NAME)/rf/Dev/Web/wsgi/rf.wsgi </code></pre> <p>... and it says this:</p> <pre><code>import sys sys.path.insert(0,'home/(USER_NAME)/rf/Dev/Web') from runserver import app as application </code></pre> <p>This is my apache config file:</p> <pre><code>&lt;VirtualHost *:8100&gt; ServerName www.relativefinder.com WSGIDaemonProcess rf user=www-data group=www-data threads=5 WSGIScriptAlias / /home/(USER_NAME)/rf/Dev/Web/wsgi/rf.wsgi &lt;Directory /home/(USER_NAME)/rf/Dev&gt; WSGIProcessGroup rf WSGIApplicationGroup %{GLOBAL} Options Indexes FollowSymLinks MultiViews Order deny,allow Allow from all &lt;/Directory&gt; &lt;/VirtualHost&gt; </code></pre> <p>The python file which loads the .so files uses the following code:</p> <pre><code>if SettingsToUse == DEV_CAF: lib = cdll.LoadLibrary('../Backend/lib/librelativefinder.so') else: lib = cdll.LoadLibrary('../Backend/lib/libtestCAF.so') </code></pre> <p>I'm quite confused that Apache doesn't seem to find it but the embedded server in flask always appears to find it. What do I need to do so that, when I run apache, it will find that .so file?</p>
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