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use availability zone to select a specified host to launch compute node, an example is like : nova boot --image 6cc22762-d684-42de-a3da-d8acd770d346 --flavor 1 --availability-zone nova:node1 test

where the 'nova' in '--availability-zone nova:node1' is the <zone> your host belongs to, default is equal to nova, you can check by run

nova-manage service list

nova-compute XH nova enabled :-) 2013-07-11 08:11:11 and the 'node1' is your host name to launch a vm.