title: How can I start multiple Tornado Server instances in multiple ports
body: <p>I need to start the blog demo in the following ports:</p>
  
  <p>127.0.0.1:8000
  127.0.0.1:8001
  127.0.0.1:8002
  127.0.0.1:8003</p>
  
  <p>When I run the application using:</p>
  
  <p>./demos/blog/blog.py</p>
  
  <p>it starts in port 8888 as defined by:</p>
  
  <p>define("port", default=8888, help="run on the given port", type=int)</p>
  
  <p>How do I run multiple instances in multiple ports?</p>