title: Centralized data access or variables
body: <p>I'm trying to find a way to access a centralized database for both retrieval and update.</p>
  
  <p>the following is what I'm looking for,</p>
  
  <p>Server 1 has this variable for example
  int counter;  </p>
  
  <p>Server 2 will be interacting with the user, and will increase the counter whenever the user uses the service, until a certain threshold is reached. when this threshold is reached then server 2 will start rejecting the user access. </p>
  
  <p>Also, the user will be able to use multiple servers (like server 2) from multiple locations and each time the user accesses the access any server the counter will be increased. </p>
  
  <p>I tried google but it's hard to search for something without a name.</p>