code: def _kill_process(self, box_config):
          
          try:
              self.logger.info('kill: {0} {{'.format(box_config.process_name))
              self.logger.info('target process pid={0}'.format(box_config.pid))
              if box_config.pid and psutil.pid_exists(box_config.pid):
                  p = psutil.Process(box_config.pid)
                  p.kill()
                  p.wait()
                  box_config.pid = None
                  self.bc_dao.update(box_config)
                  remove_pid_file(box_config.process_name)
          except Exception:
              self.logger.error('Exception on killing: {0}'.format(box_config.process_name), exc_info=True)
          finally:
              self.logger.info('}')
docs: method is called to kill a running process