title: Setting EC2 instance root device type to EBS in Rubber - Rails
body: <p>How do I set the <code>root_device_type</code> when creating an EC2 instance using <code>Rubber</code>?</p>
  
  <p>I see that after creation of the instance, the serialized instance object has <code>root_device_type</code> as <code>instance-store</code>. I want to create an instance runs in an <code>EBS</code>.</p>
  
  <p>They provide docs and sample config to create EBS volumes and mount it onto the instance but no documentation on how to create an EBS instance.</p>
  
  <p>Thanks!</p>