在OpenStack创建云主机时报错。
OpenStack在创建云主机的时候，网络、租户、路由、镜像都创建没有问题，然后在创建云主机的时候，指定了云主机选择源是一个镜像cirros，主机类型选m1.tiny最小的，然后选择网络，但是创建中就报错，Block Device Mapping is Invalid。
在网上找了很多办法一一尝试。
openstack volume service list查看到cinder-volume 的状态一直为down。
原因是在于我没有创建卷。使用命令创建卷 cinder-volumes。
pvcreate /dev/sdb1
vgcreate cinder-volumes /dev/sdb1
systemctl restart openstack-cinder-volume 重启服务
openstack volume service list 再次查看
但是此时创建云主机还是原来的错误。继续排查。
再次查看日志
[root@test ~(keystone_admin)]# tail -l /var/log/cinder/volume.log
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/utils.py", line 123, in execute
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server return processutils.execute(*cmd, **kwargs)
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py", line 389, in execute
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server cmd=sanitized_cmd)
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server ProcessExecutionError: Unexpected error while running command.
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server Command: sudo cinder-rootwrap /etc/cinder/rootwrap.conf env LC_ALL=C lvcreate -n volume-1b9a7e95-e0cd-4696-8407-f2750460e05d cinder-volumes -L 1g
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server Exit code: 5
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server Stdout: u''
2021-06-09 21:19:35.088 117234 ERROR oslo_messaging.rpc.server Stderr: u'File descriptor 10 (/dev/urandom) leaked on lvcreate invocation. Parent PID 117539: /usr/bin/python2\n Volume group "cinder-volumes" has insufficient free space (255 extents): 256 required.\n'
重启系统，准备新增硬盘。重启完成后发现，卷重名了。
[root@test ~(keystone_admin)]# vgs
VG #PV #LV #SN Attr VSize VFree
cinder-volumes 1 0 0 wz--n- 20.60g 20.60g
cinder-volumes 1 0 0 wz--n- 1020.00m 1020.00m
[root@test ~(keystone_admin)]# vgdisplay
--- Volume group ---
VG Name cinder-volumes
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 20.60 GiB
PE Size 4.00 MiB
Total PE 5273
Alloc PE / Size 0 / 0
Free PE / Size 5273 / 20.60 GiB
VG UUID ckXeby-zj25-QBsz-TalV-iiat-9fdT-g7XB4r
--- Volume group ---
VG Name cinder-volumes
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 1020.00 MiB
PE Size 4.00 MiB
Total PE 255
Alloc PE / Size 0 / 0
Free PE / Size 255 / 1020.00 MiB
VG UUID Id4N9J-7K4K-4OHO-0z1C-PBR3-9Cwa-V85QJL
[root@test ~(keystone_admin)]# vgrename Id4N9J-7K4K-4OHO-0z1C-PBR3-9Cwa-V85QJL newone
Processing VG cinder-volumes because of matching UUID Id4N9J-7K4K-4OHO-0z1C-PBR3-9Cwa-V85QJL
Volume group "Id4N9J-7K4K-4OHO-0z1C-PBR3-9Cwa-V85QJL" successfully renamed to "newone"
[root@test ~(keystone_admin)]# vgs
VG #PV #LV #SN Attr VSize VFree
cinder-volumes 1 0 0 wz--n- 20.60g 20.60g
newone 1 0 0 wz--n- 1020.00m 1020.00m
[root@test ~(keystone_admin)]# systemctl restart openstack-cinder*
[root@test ~(keystone_admin)]# vgs
VG #PV #LV #SN Attr VSize VFree
cinder-volumes 1 0 0 wz--n- 20.60g 20.60g
newone 1 0 0 wz--n- 1020.00m 1020.00m
[root@test ~(keystone_admin)]# openstack volume service list
+------------------+------------------+------+---------+-------+----------------------------+
| Binary | Host | Zone | Status | State | Updated At |
+------------------+------------------+------+---------+-------+----------------------------+
| cinder-backup | test.abc.com | nova | enabled | up | 2021-06-09T13:50:10.000000 |
| cinder-volume | test.abc.com@lvm | nova | enabled | up | 2021-06-09T13:50:10.000000 |
| cinder-scheduler | test.abc.com | nova | enabled | up | 2021-06-09T13:50:09.000000 |
+------------------+------------------+------+---------+-------+----------------------------+
重新启动服务，再次生成主机成功！！！！！