django - problem using WSGIApplicationGroup %{GLOBAL} in apache configuration

Question

im using django with apache and mod_wsgi i am facing a problem when i use WSGIApplicationGroup %{GLOBAL} in apache configuration file (.conf) . i dont know if i am using this directive correctly or i need to use it in another way , the problem is that i needed to add this directive to fix a problem for xapian as described in this ticket (http://trac.xapian.org/ticket/185) after that the search started to work but all my sites contents got mixed up, meaning site1 content appears on site2.when i removed WSGIApplicationGroup %{GLOBAL} , sites are rendering properly again but search stopped working.

here is my .conf file contents:

NameVirtualHost my_ip_address:80
WSGIApplicationGroup %{GLOBAL}
<VirtualHost my_ip_address:80>
ServerName www.site1.com
ServerAlias site1

WSGIScriptAlias / "/home/sa/www/site1/apache/django.wsgi"
<Directory "/home/sa/www/site1/apache">
    Allow from all
</Directory>

Alias /site_media/ "/home/sa/www/site1/media/"
<Directory "/home/sa/www/site1/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>


</VirtualHost>

WSGIApplicationGroup %{GLOBAL}

<VirtualHost my_ip_address:80>
ServerName www.site2.com
ServerAlias site2

WSGIScriptAlias / "/home/sa/www/site2/apache/django.wsgi"
<Directory "/home/sa/www/site2/apache">
    Allow from all
</Directory>

Alias /site_media/ "/home/sa/www/site2/media/"
<Directory "/home/sa/www/site2/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

Alias /media/ "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

</VirtualHost>



WSGIApplicationGroup %{GLOBAL}

< VirtualHost my_ip_address:80 >
ServerName www.site3.com
ServerAlias site3

WSGIScriptAlias / "/home/sa/www/site3/apache/django.wsgi"
<Directory "/home/sa/www/site3/apache">
    Allow from all
</Directory>

Alias /site_media/ "/home/sa/www/site3/media/"
<Directory "/home/sa/www/site3/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

Alias /media/ "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

</VirtualHost>


WSGIApplicationGroup %{GLOBAL}

<VirtualHost my_ip_address:80>

ServerName www.site4.com
ServerAlias site4

WSGIScriptAlias / "/home/sa/www/site4/apache/django.wsgi"
<Directory "/home/sa/www/site4/apache"> 
    Allow from all 
</Directory>

Alias /site_media/ "/home/sa/www/site4/media/"
<Directory "/home/sa/www/site4/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

Alias /media/ "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

</VirtualHost>


WSGIApplicationGroup %{GLOBAL}

<VirtualHost my_ip_address:80>
ServerName www.site5.com
ServerAlias site5

WSGIScriptAlias / "/home/sa/www/site5/apache/django.wsgi"
<Directory "/home/sa/www/site5/apache">
    Allow from all
</Directory>

Alias /site_media/ "/home/sa/www/site5/media/"
<Directory "/home/sa/www/site5/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

Alias /media/ "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/">
    Order allow,deny
    Options Indexes FollowSymLinks
    Allow from all
    IndexOptions FancyIndexing
</Directory>

</VirtualHost>

has anybody faced this issue any suggestions

thanks

Answer 1

Django's implementation prevents multiple Django instances running in same interpreter (application group). Thus if running multiple Django sites on same Apache server and must set WSGIApplicationGroup to %{GLOBAL}, then you MUST use daemon mode and delegate each Django site to a separate daemon process group. Daemon mode is preferred anyway.

Ensure you read:

http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide http://code.google.com/p/modwsgi/wiki/ReloadingSourceCode

The latter explaining part why daemon mode is good as far as making code reloading easier.