Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures

openstack创建实例时报错：

Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance 51ea72a4-db11-4756-b2e4-921aa7c7281e

思路一：
检查宿主机是否起了libvirtd，如果起了，参照下方链接将其关掉
https://blog.csdn.net/qq_38359135/article/details/120567346?spm=1001.2014.3001.5501

思路二：
直接重启libvirtd，或者stop后再start
systemctl restart libvirtd
https://blog.csdn.net/skyroach/article/details/116934063?spm=1001.2101.3001.6650.9&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-9.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-9.no_search_link

思路三：
重启所有机器(也许只重启controller也可以)，再试一下
或者
重启所有机器的容器，再重启所有机器

思路四(不推荐，因为qemu作为虚拟化层性能比较差)：
1、修改compute节点的nova.conf文件，增加：
[libvirt]
virt_type = qemu

2、重启nova-compute组件使修改生效

参考自：
https://www.cnblogs.com/omgasw/p/13043289.html

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