docs: def scale(self, replicas):
          """
          Scale service container.
  
          Args:
              replicas (int): The number of containers that should be running.
  
          Returns:
              bool: ``True`` if successful.
          """
  
          if 'Global' in self.attrs['Spec']['Mode'].keys():
              raise InvalidArgument('Cannot scale a global container')
  
          service_mode = ServiceMode('replicated', replicas)
          return self.client.api.update_service(self.id, self.version,
                                                mode=service_mode,
                                                fetch_current_spec=True)