Manual:Short URL/wiki.example.com/Page title--Subdomain using Lighttpd

Subdomain with no Subdirectory in Article URL using Lighttpd
To put MediaWiki in a root directory with the Lighttpd webserver, use the following rule (assuming mod_rewrite is loaded and your wiki is installed into /w relative to your document-root):

In your lighttpd.conf
url.rewrite-once = (   "(^/[^:]*[\./].*)" => "$1",    "^/([^?]*)(?:\?(.*))?" => "/w/index.php?title=$1&$2", )

If you want to host this on a seperate domain (which is very likely for a wiki in the root-dir) do:

$HTTP["host"] == "wiki.example.com" { server.document-root = "/path/to/webroot" url.rewrite-once = (       "(^/[^:]*[\./].*)" => "$1",        "^/([^?]*)(?:\?(.*))?" => "/w/index.php?title=$1&$2",    ) }

If you want to allow ampersands in titles too (or any other character that might be considered an argument delimiter in the query string) you can make a more complicated rule using mod_magnet. For more information, see lighttpd's documentation about mod_magnet on their website.