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After libvirt pod restarts, the virtual machines created before turn transient ,then opetrate these vms ,nova-compute will throw exception. This is because that the directory /etc/libivrt/qemu in pod contains vitual machines xml files and it is temporary, the xmls files disappear after the pod restarts, so we mount it to hostpath /etc/libvirt/qemu. Change-Id: I48fd712c2b0565cb2cfe850482e8501f4e5022a4 Closed-bug: 1760003