code: def check_docker_command_works():
      
      try:
          out = subprocess.check_output(["docker", "version"],
                                        stderr=subprocess.STDOUT,
                                        universal_newlines=True)
      except OSError:
          logger.info("docker binary is not available")
          raise CommandDoesNotExistException(
              "docker command doesn't seem to be available on your system. "
              "Please install and configure docker."
          )
      except subprocess.CalledProcessError as ex:
          logger.error("exception: %s", ex)
          logger.error("rc: %s, output: %r", ex.returncode, ex.output)
          raise ConuException(
              "`docker version` call failed, it seems that your docker daemon is misconfigured or "
              "this user can't communicate with dockerd."
          )
      else:
          logger.info("docker environment info: %r", out)
      return True
docs: Verify that dockerd and docker binary works fine. This is performed by calling `docker
      version`, which also checks server API version.
  
      :return: bool, True if all is good, otherwise ConuException or CommandDoesNotExistException
                is thrown