title: Docker-compose exclude service by default
body: <p>If I have a great many services defined in a docker-compose project, how can I exclude a service from the default <code>docker-compose up</code> command?</p>
  
  <p>For example, I have an nginx service, and an ssl service.  They conflict because they both consume port 80, so how can I make it so that the ssl service doesn't start unless I specifically run that service, and by default the <code>up</code> command will do everything EXCEPT the ssl service?</p>