hdfs.getServiceComponent(Role.DATANODE.name()).addServiceComponentHost("h1").persist();
Service nagios = cluster.addService("NAGIOS");
nagios.persist();
nagios.addServiceComponent(Role.NAGIOS_SERVER.name()).persist();
nagios.getServiceComponent(Role.NAGIOS_SERVER.name()).addServiceComponentHost("h1").persist();
installService("c1", "HDFS", false, false);
installService("c1", "NAGIOS", false, false);