Hi guys im new to openstack , and im running duel node setup compute node and controller node , controller node ,[ubuntu] Binary Host Zone Status State Updated_At nova-cert ubuntu nova enabled :-) 2012-11-30 11:52:02 nova-consoleauth ubuntu nova enabled :-) 2012-11-30 11:52:05 nova-scheduler ubuntu nova enabled :-) 2012-11-30 11:52:05 nova-volume ubuntu nova enabled :-) 2012-11-30 11:52:05 nova-compute ubuntu nova enabled :-) 2012-11-30 11:52:03 nova-network ubuntu nova enabled :-) 2012-11-30 11:52:03 nova-compute server3 nova enabled :-) 2012-11-30 11:52:02 When i try to launch a instance nova boot --image 12335371-2f82-4ebc-aed7-3ade2c357458 --flavor 1 --key_name mykey my-first-server4 , in server3 nova-compute.log print the following error , ======================================= 2012-11-30 17:24:43 TRACE nova.rpc.amqp Traceback (most recent call last): 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 253, in _process_data 2012-11-30 17:24:43 TRACE nova.rpc.amqp rval = node_func(context=ctxt, **node_args) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped 2012-11-30 17:24:43 TRACE nova.rpc.amqp return f(*args, **kw) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 183, in decorated_function 2012-11-30 17:24:43 TRACE nova.rpc.amqp sys.exc_info()) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ 2012-11-30 17:24:43 TRACE nova.rpc.amqp self.gen.next() 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 177, in decorated_function 2012-11-30 17:24:43 TRACE nova.rpc.amqp return function(self, context, instance_uuid, *args, **kwargs) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 676, in run_instance 2012-11-30 17:24:43 TRACE nova.rpc.amqp do_run_instance() 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 945, in inner 2012-11-30 17:24:43 TRACE nova.rpc.amqp retval = f(*args, **kwargs) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 675, in do_run_instance 2012-11-30 17:24:43 TRACE nova.rpc.amqp self._run_instance(context, instance_uuid, **kwargs) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 476, in _run_instance 2012-11-30 17:24:43 TRACE nova.rpc.amqp self._set_instance_error_state(context, instance_uuid) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ 2012-11-30 17:24:43 TRACE nova.rpc.amqp self.gen.next() 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 457, in _run_instance 2012-11-30 17:24:43 TRACE nova.rpc.amqp self._deallocate_network(context, instance) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ 2012-11-30 17:24:43 TRACE nova.rpc.amqp self.gen.next() 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 454, in _run_instance 2012-11-30 17:24:43 TRACE nova.rpc.amqp injected_files, admin_password) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 617, in _spawn 2012-11-30 17:24:43 TRACE nova.rpc.amqp self._legacy_nw_info(network_info), block_device_info) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped 2012-11-30 17:24:43 TRACE nova.rpc.amqp return f(*args, **kw) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 946, in spawn 2012-11-30 17:24:43 TRACE nova.rpc.amqp block_device_info=block_device_info) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 1568, in to_xml 2012-11-30 17:24:43 TRACE nova.rpc.amqp rescue, block_device_info) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 1451, in _prepare_xml_info 2012-11-30 17:24:43 TRACE nova.rpc.amqp nics.append(self.vif_driver.plug(instance, network, mapping)) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/vif.py", line 97, in plug 2012-11-30 17:24:43 TRACE nova.rpc.amqp iface) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 943, in inner 2012-11-30 17:24:43 TRACE nova.rpc.amqp retval = f(*args, **kwargs) 2012-11-30 17:24:43 TRACE nova.rpc.amqp File "/usr/lib/python2.7/dist-packages/nova/network/linux_net.py", line 1043, in ensure_bridge 2012-11-30 17:24:43 TRACE nova.rpc.amqp raise exception.Error('Failed to add interface: %s' % err) 2012-11-30 17:24:43 TRACE nova.rpc.amqp Error: Failed to add interface: sudo: unable to resolve host server3 2012-11-30 17:24:43 TRACE nova.rpc.amqp 2012-11-30 17:24:43 TRACE nova.rpc.amqp and i can access the server3 node from my controller node , root@ubuntu:~# ping server3 PING server3 (10.100.3.104) 56(84) bytes of data. 64 bytes from server3 (10.100.3.104): icmp_req=1 ttl=64 time=0.490 ms 64 bytes from server3 (10.100.3.104): icmp_req=2 ttl=64 time=0.478 ms What can be the problem ...? Thank You John