Multisite Drupal
Download the latest Drupal Code base.
Then, upload and extract all the files into a new folder for Drupal. For example: /public_html/drupal/
Next step
In this example i'll be creating two websites
test1.localhost.com
and
test2.localhost.com
I Will be needing two database for two sites
test1_db
test2_db
Next step is to inform drupal about our need for multisite.
So we need to add the sites.php file.
You can find extra examples and documentation of how to set it up in the example.sites.php file.
Copy the file and rename it to sites.php
add the following lines to configure the above sites
$sites['test1.localhost.com'] = 'test1.localhost.com';
$sites['test2.localhost.com'] = 'test2.localhost.com';
Next step will be:
In /drupal/sites create the following folders
test1.localhost.com
test2.localhost.com
After above configurations (copy sites/default/example.settings.php into sites/subsite/settings.php and edit it) you need to install both the site using url below and then after installation you can access your multi site feature.
test1.localhost.com/core/install.php
test2.localhost.com/core/install.php
You can find more info on multisite in core/INSTALL.txt.