setup multisite into multi server
You need to read this article:
Multi-site - Sharing the same code base
https://www.drupal.org/docs/7/multisite-drupal/multi-site-sharing-the-same-code-base


Create directories for your each site    
Copy config files to each directory  
Create a database for each site
Make a symbolic link for each site:

$ ln -s . site1
$ ln -s . site2