This is a straightforward walkthrough to installing Drupal in multi-site “mode” without needing to make any configuration changes to your webserver. This tutorial assumes your webserver will follow symlinks.
Download Drupal
Download the latest Drupal release from http://drupal.org. Put it inside a directory named, say drupal_multisite. It does not need to be in the webserver’s directories.
Create Your Sites Directories
Even if you are only going to start with one site, follow these steps.