openstack_mit问题，创建虚拟机异常报错

报错提示

Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance 4a263600-de56-4a01-82d6-ce6ca8079e97. Last exception: internal error: process exited while connecting to monitor: 2018-07-05T03:05:33.748347Z qemu-kvm: cannot set up guest].

创建虚拟机报错 不是一定出现 未知问题原因 有时会提示用户权限问题，也是一样修改libvirtd后重启就可以了

compute节点
vim /etc/libvirtd/qemu.conf

user = "root"
group = "root"

重启服务
systemctl restart libvirtd