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。
[root@compute1 nova]# systemctl status libvirtd.service ● libvirtd.service - Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: active (running) since Mon 2018-06-25 20:05:45 CST; 3min 48s ago Docs: man:libvirtd(8) https://libvirt.org Main PID: 6106 (libvirtd) Tasks: 17 (limit: 32768) CGroup: /system.slice/libvirtd.service └─6106 /usr/sbin/libvirtdJun 25 20:05:45 compute1 systemd[1]: Starting Virtualization daemon...Jun 25 20:05:45 compute1 systemd[1]: Started Virtualization daemon.Jun 25 20:05:45 compute1 libvirtd[6106]: 2018-06-25 12:05:45.278+0000: 6139: info : libvirt version: 3.9.0, package: 14.el7_5.5 (CentOS BuildSystem <http://...entos.org)Jun 25 20:05:45 compute1 libvirtd[6106]: 2018-06-25 12:05:45.278+0000: 6139: info : hostname: compute1Jun 25 20:05:45 compute1 libvirtd[6106]: 2018-06-25 12:05:45.278+0000: 6139: error : virCgroupMakeGroup:1093 : Failed to create controller cpu for group: No... directoryJun 25 20:06:30 compute1 libvirtd[6106]: 2018-06-25 12:06:30.019+0000: 6115: error : virCapabilitiesDomainDataLookupInternal:739 : invalid argument: could n...intype=kvmJun 25 20:06:30 compute1 libvirtd[6106]: 2018-06-25 12:06:30.019+0000: 6115: error : virCapabilitiesDomainDataLookupInternal:739 : invalid argument: could n...intype=kvmHint: Some lines were ellipsized, use -l to show in full.
openstack控制台错误如下：
消息 Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance 7c4394d1-c7ef-4cff-9d32-4d91c2c87617. 编码 500 详情 File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 580, in build_instances raise exception.MaxRetriesExceeded(reason=msg) 已创建 June 25, 2018, 12:06 p.m.####
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
