Here is a recipe for configuring Moin with CGI on Apache 2.0 with multiple wikis (i.e. a farm), '''without having the wikis mounted at the root of domains'''.  This last bit is a touch tricky, and I could find no recipes for it, though I found some requests for such a recipe.

The wikis are to be at:

 * hello.ogbuji.net/wiki/alpha
 * hello.ogbuji.net/wiki/beta

Key snippets from vhost definition (i.e. part of httpd.conf)

{{{
 <Directory /opt/www/hello.ogbuji.net/cgi-bin>
    Options +ExecCGI
    Order allow,deny
    allow from all
 </Directory>

 <Directory /opt/www/hello.ogbuji.net>
    Options FollowSymLinks
    Order allow,deny
    allow from all
 </Directory>

 Alias /moin "/usr/share/moin/htdocs/"
 ScriptAlias / "/opt/www/hello.ogbuji.net/cgi-bin/moin.cgi"

 RewriteEngine on
 RewriteRule ^/wiki/[^/]+/(.*) /opt/www/hello.ogbuji.net/cgi-bin/moin.cgi/$1  [last,type=application/x-httpd-cgi]
}}}

Make sure `/opt/www/hello.ogbuji.net/cgi-bin/moin.cgi` is correctly updated to load farmconfig.py, as usual.

Key snippets from farmconfig.py:

{{{
wikis = [
    ("alpha",  r"^hello.ogbuji.net/wiki/alpha.*$"),
    ("beta",  r"^hello.ogbuji.net/wiki/beta.*$"),
]
}}}

And other than that, config should be pretty typical of use with Apache/CGI.  The trick here is the rewrite rule:

{{{
RewriteRule ^/wiki/[^/]+/(.*) /opt/www/hello.ogbuji.net/cgi-bin/moin.cgi/$1 #...
}}}

Which matches e.g. `http://hello.ogbuji.net/wiki/alpha/FrontPage` and translates it to `http://hello.ogbuji.net/opt/www/hello.ogbuji.net/cgi-bin/moin.cgi/FrontPage`.  moin.cgi sees the original, pre-rewrite URL, and so it matches it to the farmconfig entry just fine, and identifies the right wiki instance.  It ```also``` gets the `FrontPage`, which allows it to get the right page from the right wiki.  Most such examples use a pattern such as `^/wiki/(.*)`, but this leaks the wiki name into the page spec for moin.cgi, and so it would think you were accessing a page called `alpha/FrontPage`, which is clearly wrong.  Adding that `[^/]+/` bit "eats" the wiki name before passing it to moin.cgi, correcting the problem.