title: How can I change the port that thin binds to when starting a Rails server?
body: <p>I inherited a Rails application, and I'm trying to understand it. However, when I run:</p>
  
  <pre><code>rails s
  </code></pre>
  
  <p>I receive this log:</p>
  
  <pre><code>=&gt; Booting Thin
  =&gt; Rails 3.2.1 application starting in development on http://0.0.0.0:3000
  =&gt; Call with -d to detach
  =&gt; Ctrl-C to shutdown server
  &gt;&gt; Thin web server (v1.3.1 codename Triple Espresso)
  &gt;&gt; Maximum connections set to 1024
  &gt;&gt; Listening on 0.0.0.0:3000, CTRL+C to stop
  </code></pre>
  
  <p>However, this seems problematic to me, as both servers are trying to listen on 3000. What makes rails launch thin when I run <code>rails s</code>?</p>