title: How do I check if my local docker image is outdated, without pushing from somewhere else?
body: <p>I'm running a react app in a docker container, on a Coreos server. Let's say it's been pulled from dockerhub from <code>https://hub.docker.com/r/myimages/myapp</code>.</p>
  
  <p>Now I want to check periodically if the dockerhub image for the app container has been updated, to see if the image I'm running locally is behind.</p>
  
  <p>What would be the most efficient way to check if a local docker image is outdated compared to the remote image? All solutions I've found so far are bash scripts or external services that push on an update. I'd like to find a solution that is as native to docker as possible, and would like to refrain from pushing a notification from somewhere else (to alert the server of an updated image).</p>