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我（試圖）在Ubuntu 12.04服務器上測試一個新的OpenStack Essex安裝，在完成本文後全面更新。當我啓動我的第一臺虛擬機時，由於配置錯誤導致了一些網絡問題，所以我刪除了固定的IPv4網絡定義。顯然這是一個錯誤，因爲嘗試啓動映像的nova-compute節點在守護進程啓動時崩潰，出現「NetworkNotFound」錯誤，大概是因爲它找不到我必須刪除的錯誤配置的網絡ID。我已經發布了「nova delete」來清理虛擬機，但它仍然顯示「nova list ...」等等（我猜測由於nova-compute無法啓動，所以無法檢查隊列中刪除破碎的形象。所以...我如何獲得新星計算重新開始，並刪除VM的所有痕跡？如何使用「NetworkNotFound」從nova-compute崩潰中恢復？
2012-05-02 15:46:02 TRACE nova Traceback (most recent call last):
2012-05-02 15:46:02 TRACE nova File "/usr/bin/nova-compute", line 49, in <module>
2012-05-02 15:46:02 TRACE nova service.wait()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 413, in wait
2012-05-02 15:46:02 TRACE nova _launcher.wait()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 131, in wait
2012-05-02 15:46:02 TRACE nova service.wait()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 166, in wait
2012-05-02 15:46:02 TRACE nova return self._exit_event.wait()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
2012-05-02 15:46:02 TRACE nova return hubs.get_hub().switch()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 177, in switch
2012-05-02 15:46:02 TRACE nova return self.greenlet.switch()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 192, in main
2012-05-02 15:46:02 TRACE nova result = function(*args, **kwargs)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 101, in run_server
2012-05-02 15:46:02 TRACE nova server.start()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/service.py", line 162, in start
2012-05-02 15:46:02 TRACE nova self.manager.init_host()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 247, in init_host
2012-05-02 15:46:02 TRACE nova self.reboot_instance(context, instance['uuid'])
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped
2012-05-02 15:46:02 TRACE nova return f(*args, **kw)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 153, in decorated_function
2012-05-02 15:46:02 TRACE nova function(self, context, instance_uuid, *args, **kwargs)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 177, in decorated_function
2012-05-02 15:46:02 TRACE nova sys.exc_info())
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-02 15:46:02 TRACE nova self.gen.next()
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 171, in decorated_function
2012-05-02 15:46:02 TRACE nova return function(self, context, instance_uuid, *args, **kwargs)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 896, in reboot_instance
2012-05-02 15:46:02 TRACE nova network_info = self._get_instance_nw_info(context, instance)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 313, in _get_instance_nw_info
2012-05-02 15:46:02 TRACE nova instance)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/network/api.py", line 219, in get_instance_nw_info
2012-05-02 15:46:02 TRACE nova 'args': args})
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/rpc/__init__.py", line 68, in call
2012-05-02 15:46:02 TRACE nova return _get_impl().call(context, topic, msg, timeout)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 674, in call
2012-05-02 15:46:02 TRACE nova return rpc_amqp.call(context, topic, msg, timeout, Connection.pool)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 338, in call
2012-05-02 15:46:02 TRACE nova rv = list(rv)
2012-05-02 15:46:02 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 306, in __iter__
2012-05-02 15:46:02 TRACE nova raise result
2012-05-02 15:46:02 TRACE nova RemoteError: Remote error: NetworkNotFound Network 3 could not be found.
2012-05-02 15:46:02 TRACE nova [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 252, in _process_data\n rval = node_func(context=ctxt, **node_args)\n', u' File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 258, in wrapped\n return func(self, context, *args, **kwargs)\n', u' File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 957, in get_instance_nw_info\n network = self._get_network_by_id(context, vif[\'network_id\'])\n', u' File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 1733, in _get_network_by_id\n network_id)\n', u' File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 1549, in _get_network_by_id\n return self.db.network_get(context, network_id)\n', u' File "/usr/lib/python2.7/dist-packages/nova/db/api.py", line 755, in network_get\n return IMPL.network_get(context, network_id)\n', u' File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 120, in wrapper\n return f(*args, **kwargs)\n', u' File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 1920, in network_get\n raise exception.NetworkNotFound(network_id=network_id)\n', u'NetworkNotFound: Network 3 could not be found.\n'].