在httpd.conf中，对某个主机进行以下操作：

<VirtualHost _default_:80>
ServerAdmin yourmail@domain.com
DocumentRoot /YourWwwRoot/.default
ServerName all-sites
ErrorLog logs/all-sites-error_log
CustomLog logs/all-sites-access_log common
...

Working with virtual hosts under Apache2 is pretty easy, but I had some trouble getting things started due to some unclear docs and lack of examples. My biggest problem was the "HTTP 403 / client denied by server configuration error".