title: Can I clean /var/lib/docker/tmp?
body: <p>My server is CoreOS. There are so many files in <code>/var/lib/docker/tmp</code>, their name's like "<code>GetV2ImageBlob998303926</code>".</p>
  
  <p>The size of all <code>GetV2ImageBlobxxxxxxxx</code> files is 640MB.</p>
  
  <p>Can I remove all files in <code>/var/lib/docker/tmp</code>?</p>