/**
  * @param \Symfony\Component\Console\Input\InputInterface   $input
  * @param \Symfony\Component\Console\Output\OutputInterface $output
  * @return mixed
  */
 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $output->writeln('<info>INFO:</info> environment=<comment>' . $this->config->environment() . '</comment>');
     if (!$this->pidFileExists()) {
         $output->writeln('<error>ERROR:</error> ' . $this->getPidFileName() . ' does not exist');
         $output->writeln('<error>ERROR:</error> ' . Version::NAME . ' service not running');
     } else {
         $output->writeln('<info>INFO:</info> ' . Version::NAME . ' service is running');
     }
     if ('' === $this->container->version()) {
         $output->writeln('<error>ERROR:</error> container service is not available');
     } else {
         $output->writeln('<info>INFO:</info> container service is available');
     }
     if ('' === $this->loadBalancer->version()) {
         $output->writeln('<error>ERROR:</error> load-balancer service is not available');
     } else {
         $output->writeln('<info>INFO:</info> load-balancer service is available');
     }
 }