title: Systemd cgroup flag passed, but systemd support for managing cgroups is not available - Docker error
body: <p>I had installed <code>docker</code> in my aws linux machine a while ago and was using it for <code>kong</code> testing purposes,
  Machine details:
  Linux <code>ip-172-31-10-102 4.9.70-22.55.amzn1.x86_64</code> #1 <code>SMP</code> Wed Dec 20 <code>23:36:28</code> <code>UTC 2017 x86_64 x86_64 x86_64 GNU/Linux</code></p>
  
  <p>Today when i tried to run normal hello-world container in my docker, i am facing the following error.</p>
  
  <pre><code>[root@ip-172-31-10-102 ~]# docker run hello-world
  systemd cgroup flag passed, but systemd support for managing cgroups is not 
  available
  docker: Error response from daemon: oci runtime error: systemd cgroup flag 
  passed, but systemd support for managing cgroups is not available.
  ERRO[0000] error waiting for container: context canceled
  </code></pre>
  
  <p>I am not sure what configuration has messed in here,i am able to see docker info and container list everything but not able to run a container.
  i tried re-installing dockers but still see the same error.</p>