Change base URL of multi-site install I've searched a bit for the answer to this, but all the answers seem to refer to single sites, or they just don't work (or I'm doing them wrong).  

I have an out-of-the-box Bitnami image setup on Amazon EC2, and when I point my domain to the server, then visit the domain, I need to put a /drupal on the end to get to the drupal sites.  

I need to figure out how to make example.com and example2.com point to the drupal installation instead of example.com/drupal and example2.com/drupal.  

Is this a drupal configuration that I need to change, or an Apache configuration, or what?
This is more than likely an apache configuration.  Changing it to the RewriteBase /drupal like above will simply allow drupal to know that /drupal is where the site is installed.  You need to either look into moving the files into the original directory that the domain is pointed to, or look into finding the apache virtual host file and point it to the /drupal folder.