服务器重启后，cinder-volume服务状态down

devstack服务器断电重启后，openstack有些服务无法启动。

source /opt/stack/devstack/openrc admin admin
nova service-list --binary nova-compute
/opt/stack/devstack/tools/discover_hosts.sh

执行：

systemctl restart devstack@*

重启服务后，nova服务up状态。但是cinder-volume服务开始up状态，过一会儿是down状态。

查看cinder服务状态：

cinder service-list

开始cinder服务up，
查询日志：

sudo journalctl -a -u [email protected] | grep  "ERROR"

显示：

Aug 25 12:04:05 computer cinder-volume[5124]: ERROR cinder.utils [None req-5f09d1d8-9f85-4f77-82f0-eff577d4de0e None None] Volume driver LVMVolumeDriver not initialized
Aug 25 12:04:05 computer cinder-volume[5124]: ERROR cinder.volume.manager [None req-5f09d1d8-9f85-4f77-82f0-eff577d4de0e None None] Cannot complete RPC initialization because driver isn't initialized properly.: cinder.exception.DriverNotInitialized: Volume driver not ready.

Aug 25 12:04:15 computer cinder-volume[5124]: ERROR cinder.service [-] Manager for service cinder-volume computer@lvmdriver-1 is reporting problems, not sending heartbeat. Service will appear "down".

过一会儿再执行：

cinder service-list

输出：

+------------------+------------------------+------+---------+-------+----------------------------+-----------------+
| Binary           | Host                   | Zone | Status  | State | Updated_at                 | Disabled Reason |
+------------------+------------------------+------+---------+-------+----------------------------+-----------------+
| cinder-scheduler | controller             | nova | enabled | up    | 2020-08-25T06:19:08.000000 | -               |
| cinder-volume    | controller@lvmdriver-1 | nova | enabled | down  | 2020-08-25T06:19:00.000000 | -               |
| cinder-volume    | computer@lvmdriver-1   | nova | enabled | down  | 2020-08-25T06:19:06.000000 | -               |
+------------------+------------------------+------+---------+-------+----------------------------+-----------------+

开始以为是时间同步问题，但是检查时间后，发现不是时间同步问题。
controller 下执行：

vgs

无输出。
computer下，
执行：

vgs

也无输出。

分别再controller和computer下执行：

sudo losetup /dev/loop0 /opt/stack/data/stack-volumes-default-backing-file

输出：

losetup: /opt/stack/data/stack-volumes-default-backing-file: failed to set up loop device: Device or resource busy

重启服务器：
重复上述步骤

再执行（#将/opt/stack/data/stack-volumes-lvmdriver-1-backing-file绑在第一个空闲的loop）：

sudo losetup -f /opt/stack/data/stack-volumes-lvmdriver-1-backing-file

再分别执行

vgs

显示：

  VG                        #PV #LV #SN Attr   VSize   VFree
  stack-volumes-lvmdriver-1   1   1   0 wz--n- <24.00g <1.15g

再次重启cinder服务：

systemctl restart devstack@c*

cinder service-list

显示：

+------------------+------------------------+------+---------+-------+----------------------------+-----------------+
| Binary           | Host                   | Zone | Status  | State | Updated_at                 | Disabled Reason |
+------------------+------------------------+------+---------+-------+----------------------------+-----------------+
| cinder-scheduler | controller             | nova | enabled | up    | 2020-08-25T06:19:08.000000 | -               |
| cinder-volume    | controller@lvmdriver-1 | nova | enabled | up    | 2020-08-25T06:19:00.000000 | -               |
| cinder-volume    | computer@lvmdriver-1   | nova | enabled | up    | 2020-08-25T06:19:06.000000 | -               |
+------------------+------------------------+------+---------+-------+----------------------------+-----------------+

问题解决。

但是问题产生具体原因待查。

参考文档：
《cinder-volume down》

删除多余的cinder volume：

cinder-manage service remove cinder-volume computer@lvmdriver-2

服务器重启后，cinder-volume服务状态down

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