How to implement multiple instances of a Drupal7 site?

Hi,

I have to create many instances of the same Drupal7 site that differ only for the settings.php file and the database.

The standard code, the custom modules, the libraries and the theme have to be the same for all these sites. The need is to share the code between all the instances.

Which is the smartest way to do this and save the space on the web server?

Thank you very much

cld

Drupal version: 


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