title: How to remove docker images which created 7 days ago automatically?
body: <p>Is there a way to remove built docker images some days ago?</p>
  
  <p>If we check <code>docker images</code>, will got:</p>
  
  <pre><code>REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
  </code></pre>
  
  <p>There exists a <code>CREATED</code> item.</p>
  
  <p>Researched from the <a href="https://docs.docker.com/engine/reference/commandline/rmi/" rel="noreferrer">official document</a>, didn't find an option for that.</p>