title: Increase Docker container size from default 10GB on rhel7
body: <p>When I launch a container from rhel7.3 image, the default container size is 10GB. I want to increase it to 20GB. I tried the below ways but I had no luck</p>
  
  <p>1) Added "DOCKER_STORAGE_OPTIONS": "--storage-opt dm.basesize=20G" in  /etc/docker/daemon.json file. /etc/docker/daemon.json file is not there by default so I had to add it and tried restarting docker. Restart fails with the below error:</p>
  
  <p>"unable to configure the Docker daemon with file /etc/docker/daemon.json: the following directives don't match any configuration option: DOCKER_STORAGE_OPTIONS\n"</p>
  
  <p>2) Added "dm.basesize=20G" parameter while I launch the conatiner</p>
  
  <p>docker run --privileged --storage-opt "dm.basesize=20G" -d IMAGE_ID 
  but it fails to launch with error </p>
  
  <p>"docker: Error response from daemon: Unknown option dm.basesize."</p>
  
  <p>Any help on how I can achieve to launch a container with 20GB instead of the default 10GB?
  Thanks,
  Premchand</p>