def get_summary_preview_str(summary):
  """
  Gets a oneliner string displaying the summarized cluster health
  """
  _s = [
    ('nn1', summary.nn1.is_healthy),
    ('dn1', summary.dn1.is_healthy),
    ('rman', summary.rman.is_healthy),
    ('nm1', summary.nm1.is_healthy),
    ('mrhist', summary.mrhist.is_healthy),
    ('hs', summary.hs.is_healthy),
    ('client', summary.client.is_healthy),
    ('sql', summary.sql.is_healthy)
  ]
  _s2 = map(lambda a : '%s %s' % \
    (('\u2705' if a[1] else '\u274C'), a[0]), _s)
  return ', '.join(_s2)