openstack由于cpu未开启虚拟化，导致创建实例失败原因分析
cpu虽然支持vmx，但主板未开启，安装完openstack出现莫名其妙问题
解决办法：
方法1：修改/etc/nova/nova.conf，增加
[libvirt]
virt_type = qemu
方法2：开启主板cpu虚拟化功能
Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures
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