code: def reload(self):
          
          status = self.get_status()
          if status != 'running':
              raise ClusterError('cannot reload: cluster is not running')
  
          process = subprocess.run(
              [self._pg_ctl, 'reload', '-D', self._data_dir],
              stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  
          stderr = process.stderr
  
          if process.returncode != 0:
              raise ClusterError(
                  'pg_ctl stop exited with status {:d}: {}'.format(
                      process.returncode, stderr.decode()))
docs: Reload server configuration.