title: Triggering an Airflow DAG from terminal not working
body: <p>I'm trying to use airflow to define a specific workflow that I want to manually trigger from the command line. </p>
  
  <p>I create the DAG and add a bunch of tasks.</p>
  
  <pre><code>dag = airflow.DAG(
      "DAG_NAME",
      start_date=datetime(2015, 1, 1),
      schedule_interval=None,
      default_args=args)
  </code></pre>
  
  <p>I then run in the terminal</p>
  
  <pre><code>airflow trigger_dag DAG_NAME
  </code></pre>
  
  <p>and nothing happens. The scheduler is running in another thread. Any direction is much appreciated. Thank You</p>