實例執行所請求操作失敗，實例處於錯誤狀態。: 請稍后再試
[錯誤: Build of instance beaeb5e0-26eb-4044-ae14-bb87d509886d aborted: Failed to allocate the network(s), not rescheduling.].
解決辦法：
修改/etc/nova/nova.conf文件
#Fail instance boot if vif plugging fails
vif_plugging_is_fatal = False
#Number of seconds to wait for neutron vif
#plugging events to arrive before continuing or failing
#(see vif_plugging_is_fatal). If this is set to zero and
#vif_plugging_is_fatal is False, events should not be expected to arrive at all.
vif_plugging_timeout = 0