title: Upgrading Docker on Amazon Linux AMI
body: <p>I want to upgrade Docker to v1.8 on Amazon Linux.</p>
  
  <p>At the time of writing their internal yum package repository has: <code>Docker version 1.7.1, build 786b29d/1.7.1</code>.</p>
  
  <p><strong>Things I have already tried</strong></p>
  
  <p>Manually installing from the <a href="https://docs.docker.com/installation/">Docker project's repo</a></p>
  
  <blockquote>
    <p>Error: Package: docker-engine-1.8.2-1.el7.centos.x86_64 (dockerrepo)
    Requires: systemd-units</p>
  </blockquote>