If running the management agent on a host with multiple network interfaces, the createdomain command may fail if not all network interfaces are on the same subnet:
hadbm:Error 22020: The management agents could not establish a domain, please check that the hosts can communicate with UDP multicast. |
The management agents will (if not configured otherwise) use the "first" interface for UDP multicasts ("first" as defined by the result from java.net.NetworkInterface.getNetworkInterfaces()).