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I replace the nova.conf file with https://lists.launchpad.net/openstack/pdfuNjHGvU5UA.pdf mentioned, and now nova-compute server doesn't work on my second physical host essex-2! nova-compute.log:

2012-05-18 09:53:37 CRITICAL nova [-] Unable to read from monitor: Connection reset by peer 2012-05-18 09:53:37 TRACE nova Traceback (most recent call last): 2012-05-18 09:53:37 TRACE nova File "/usr/bin/nova-compute", line 49, in <module> 2012-05-18 09:53:37 TRACE nova service.wait() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 413, in wait 2012-05-18 09:53:37 TRACE nova _launcher.wait() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 131, in wait 2012-05-18 09:53:37 TRACE nova service.wait() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 166, in wait 2012-05-18 09:53:37 TRACE nova return self._exit_event.wait() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait 2012-05-18 09:53:37 TRACE nova return hubs.get_hub().switch() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 177, in switch 2012-05-18 09:53:37 TRACE nova return self.greenlet.switch() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 192, in main 2012-05-18 09:53:37 TRACE nova result = function(args, *kwargs) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 101, in run_server 2012-05-18 09:53:37 TRACE nova server.start() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 162, in start 2012-05-18 09:53:37 TRACE nova self.manager.init_host() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 247, in init_host 2012-05-18 09:53:37 TRACE nova self.reboot_instance(context, instance['uuid']) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped 2012-05-18 09:53:37 TRACE nova return f(args, *kw) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 153, in decorated_function 2012-05-18 09:53:37 TRACE nova function(self, context, instance_uuid, args, *kwargs) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 177, in decorated_function 2012-05-18 09:53:37 TRACE nova sys.exc_info()) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ 2012-05-18 09:53:37 TRACE nova self.gen.next() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 171, in decorated_function 2012-05-18 09:53:37 TRACE nova return function(self, context, instance_uuid, args, *kwargs) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 898, in reboot_instance 2012-05-18 09:53:37 TRACE nova reboot_type) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped 2012-05-18 09:53:37 TRACE nova return f(args, *kw) 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 718, in reboot 2012-05-18 09:53:37 TRACE nova if self._soft_reboot(instance): 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 754, in _soft_reboot 2012-05-18 09:53:37 TRACE nova dom.create() 2012-05-18 09:53:37 TRACE nova File "/usr/lib/python2.7/dist-packages/libvirt.py", line 551, in create 2012-05-18 09:53:37 TRACE nova if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) 2012-05-18 09:53:37 TRACE nova libvirtError: Unable to read from monitor: Connection reset by peer 2012-05-18 09:53:37 TRACE nova