title: How to garbage-collect unused docker images?
body: <p>All</p>
  
  <p>use Google Computing Engine to run Monte Carlo by deploying Docker images, running them, deleting them, deploying more images, ...</p>
  
  <p>If I look into disk usage of the bucket which has containers/images</p>
  
  <blockquote>
    <p>gsutils du gs://bucket</p>
  </blockquote>
  
  <p>I'll get close to 6Gb of space used</p>
  
  <p>But! I know that right now there is only one docker image </p>
  
  <blockquote>
    <p>gcloud container images list --repository=repo</p>
  </blockquote>
  
  <p>and it should take no more than 1.5Gb.</p>
  
  <p>Is there good and simple way to do garbage collection? How I could clean-up all images which are NOT used right now, and get storage usage down to something real?</p>