title: How do links and scaling work together in docker compose?
body: <p>Here's my understanding of docker compose:</p>
  
  <ul>
  <li>You can "scale" a service to run it in multiple containers at once.</li>
  <li>If you link service A to service B, service A has access to a container running service B.</li>
  </ul>
  
  <p>Is my understanding correct, and if so, where does a link connect if there are multiple containers running the service?</p>