How to use different Flask template directory from Apache VirtualHost - apache

Question

I want to serve up different 'look' and content for users on my flask site based on the virtualhost they use to reach the site without duplicating the entire code tree.
E.g. going to red.mysite.com would serve up red pages and 'red' content where the default is white.
I can do this today for the look using using a custom static tree in the Apache config to se the css and images but I want to have a custom /template tree too so I can change the page content in my templates to 'Red' versions.
Is there a way to set template dir from VirtualHost directives like with /static?
<VirtualHost *:80>
ServerName mysite.com
ServerAdmin admin#mywebsite.com
WSGIScriptAlias / /var/www/mysite.wsgi
<Directory /var/www/mysite/>
Order allow,deny
Allow from all
</Directory>
Alias /static /var/www/mysite/static
<Directory /var/www/mysite/static/>
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
<VirtualHost *:80>
ServerName red.mysite.com
ServerAdmin admin#mywebsite.com
WSGIScriptAlias / /var/www/mysite.wsgi
<Directory /var/www/mysite/>
Order allow,deny
Allow from all
</Directory>
Alias /static /var/www/mysite/red/static
<Directory /var/www/mysite/red/static/>
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Answer 1

Graham pointed me down the right path.
Here is how I did it:
changed conf to add in processgroup
<VirtualHost *:80>
ServerName mysite.com
ServerAdmin admin#mywebsite.com
WSGIDaemonProcess default
WSGIProcessGroup default
WSGIScriptAlias / /var/www/mysite.wsgi
<Directory /var/www/mysite/>
Order allow,deny
Allow from all
</Directory>
Alias /static /var/www/mysite/static
<Directory /var/www/mysite/static/>
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
<VirtualHost *:80>
ServerName red.mysite.com
ServerAdmin admin#mywebsite.com
WSGIDaemonProcess red
WSGIProcessGroup red
WSGIScriptAlias / /var/www/mysite.wsgi
<Directory /var/www/mysite/>
Order allow,deny
Allow from all
</Directory>
Alias /static /var/www/mysite/red/static
<Directory /var/www/mysite/red/static/>
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
Modified Flask app creation as follows:
import mod_wsgi
instance = mod_wsgi.process_group
if instance == 'red':
app = Flask(__name__, template_folder='red/templates')
else:
app = Flask(__name__)
Now anyone coming in on the 'Red' URL sees templates in red/templates.
Bill