messagebus = services.knownservices.messagebus
    try:
        messagebus.start()
    except Exception, e:
        print("Messagebus service unavailable: %s" % str(e))
        sys.exit(3)
    # Ensure that certmonger has been started at least once to generate the
    # cas files in /var/lib/certmonger/cas.
    cmonger = services.knownservices.certmonger
    try:
        cmonger.restart()
    except Exception, e:
        print("Certmonger service unavailable: %s" % str(e))
        sys.exit(3)
    try:
        cmonger.enable()
    except Exception, e:
        print("Failed to enable Certmonger: %s" % str(e))
        sys.exit(3)
...

    if not options.no_ntp:
        try:
            ipaclient.ntpconf.check_timedate_services()
        except ipaclient.ntpconf.NTPConflictingService, e:
            print("WARNING: conflicting time&date synchronization service '%s'"
                  " will" % e.conflicting_service)
            print("be disabled in favor of ntpd")
            print("")
        except ipaclient.ntpconf.NTPConfigurationError:
            pass