public function containersActive() {
    $ps = $this->taskDockerComposePs()
      ->file($this->dockerComposeFile)
      ->projectName($this->config->get('name'))
      ->setVerbosityThreshold(VerbosityThresholdInterface::VERBOSITY_DEBUG)
      ->printOutput(FALSE)
      ->run()
      ->getMessage();
    $this->say("$ps");
  }