nova serivce-list 当中的host一定要和对应的计算节点的主机名对应上，尤其注意大小写！不然实例是无法创建的，会在nova-conductor.log报如下错误：
2022-05-22 16:21:52.709 33815 WARNING nova.scheduler.utils [req-539db2f3-8a78-44d3-b951-829699343b6e bfb768b40e814237a3592a0774c931ee b34ce77c3dff4b788b84aea560968675 - default default] [instance: 2c8869e2-1ccf-42d0-94bd-d5f8ca1d37c7] Setting instance to ERROR state.: NoValidHost_Remote: \u627e\u4e0d\u5230\u6709\u6548\u4e3b\u673a\uff0c\u539f\u56e0\u662f \u6ca1\u6709\u8db3\u591f\u7684\u4e3b\u673a\u53ef\u7528\u3002\u3002
