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Here is an over-simplified recipe for setting up mod\_wsgi with web2py on CentOS 5.  See the Web2py manual for the authoritative specification of how to configure mod_wsgi in general.

Install Apache and the development package (to get the apxs program needed by mod_wsgi);

sudo yum install httpd httpd-devel

Get the mod_wsgi source and build it:

cd /usr/local/src
    wget http://modwsgi.googlecode.com/files/mod_wsgi-2.5.tar.gz
    tar xzvf mod_wsgi-2.5.tar.gz
    cd mod_wsgi-2.5
    configure  --with-python=/usr/local/bin/python2.5
    make
    sudo make install

Edit /etc/httpd/conf/httpd.conf to load modules/mod_wsgi.so and to point to the right python instance:

LoadModule wsgi_module modules/mod_wsgi.so
 
Create /etc/httpd/conf.d/web2py.conf  with this (which assumes web2py is installed in /var/local/web2py/, and web2py is the root of the Apache site):

WSGIScriptAlias / /var/local/web2py/wsgihandler.py

Note that the web2py folders need to be writable by the apache process.

Running as a mod_wsgi daemon process
--------------------------------

The above sets up mod\_wsgi in "embedded" mode.  To run as a mod\_wsgi daemon, add this to web2py.conf:

WSGIDaemonProcess web2py

and put this right below the WSGIScriptAlias line:

WSGIProcessGroup web2py

I also had to make a /var/www/.python-eggs directory that is writable by the apache process; otherwise the MySQLdb module would not import into web2py.

Finally, I had to disable mod\_mem\_cache in apache to get around errors like this:  "SystemError: NULL result without error in PyObject_Call".  But when I enable that again later I no longer see the errors.  Confusing.

(Edits:  No longer recommending WSGIPythonHome.  Use  --with-python when configuring mod_wsgi.)

-[FCY](http://fred.yankowski.com)

AlterEgo

old web2py blog

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