rbd删除卷失败，存在快照无法删除

rbd删除卷时报错，反馈如下

# rbd rm pool_name/volume_name
2021-10-25 10:32:42.192 7f789c502c80 -1 librbd::image::PreRemoveRequest: 0x5610334fcc40 check_image_snaps: image has snapshots - not removing
Removing image: 0% complete...failed.
rbd: image has snapshots - these must be deleted with 'rbd snap purge' before the image can be removed.

此时是因为有快照存在，所以无法删除。
使用snap list命令可以查看卷下快照，后snap rm删除即可。
若提示快照保护状态还需执行rbd unprotect进行解保护

# rbd snap list pool_name/volume_name
SNAPID NAME       SIZE  PROTECTED TIMESTAMP                10 tempkoswji 1 GiB yes       Tue Oct 19 11:16:07 2021
#  rbd snap rm pool_name/volume_name@tempkoswji
Removing snap: 100% complete...done.
# rbd rm pool_name/volume_name
Removing image: 100% complete...done.

注：还存在一种情况，快照删除失败

此时可能是快照做过克隆，需找到克隆出的卷，进行还原

# rbd flatten pool_name/kelong

还原之后对快照进行解保护，快照即可删除

# rbd unprotect pool_name/volume_name@snap_name

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