title: Set the selinux status to `Permissive`, still can not run docker
body: <p>After I install the docker, I have set the selinux status to <code>Permissive</code>, still can not run docker. </p>
  
  <p>In my <code>/etc/selinux/config</code>, I have edit the <code>SELINUX=disabled</code>.</p>
  
  <p>and <code>setenforce 0</code>, check with:</p>
  
  <pre><code># getenforce
  Permissive 
  </code></pre>
  
  <p>I use <code>systemctl start docker</code>, but failed, get bellow error:</p>
  
  <pre><code># systemctl status docker.service
  ● docker.service - Docker Application Container Engine
     Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since 五 2018-06-29 09:05:47 CST; 14s ago
       Docs: http://docs.docker.com
    Process: 21615 ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current --init-path=/usr/libexec/docker/docker-init-current --seccomp-profile=/etc/docker/seccomp.json $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=1/FAILURE)
   Main PID: 21615 (code=exited, status=1/FAILURE)
  
  6月 29 09:05:46 123.xyz systemd[1]: Starting Docker Application Container Engine...
  6月 29 09:05:46 123.xyz dockerd-current[21615]: time="2018-06-29T09:05:46.451911058+08:00" level=warning msg="could not ch...found"
  6月 29 09:05:46 123.xyz dockerd-current[21615]: time="2018-06-29T09:05:46.453472267+08:00" level=info msg="libcontainerd: ...21626"
  6月 29 09:05:47 123.xyz dockerd-current[21615]: time="2018-06-29T09:05:47.463085812+08:00" level=warning msg="overlay2: the back...
  6月 29 09:05:47 123.xyz dockerd-current[21615]: Error starting daemon: SELinux is not supported with the overlay2 graph dr...false)
  6月 29 09:05:47 123.xyz systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
  6月 29 09:05:47 123.xyz systemd[1]: Failed to start Docker Application Container Engine.
  6月 29 09:05:47 123.xyz systemd[1]: Unit docker.service entered failed state.
  6月 29 09:05:47 123.xyz systemd[1]: docker.service failed.
  Hint: Some lines were ellipsized, use -l to show in full.
  </code></pre>
  
  <p>Why there still says:</p>
  
  <blockquote>
    <p>Error starting daemon: SELinux is not supported with the overlay2 graph dr...false)</p>
  </blockquote>
  
  <p>My linux is <code>CentOS 7.2</code></p>