rbd flatten扁平化镜像

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rbd flatten

. @" e- v# V6 V* l( F5 O( d7 Krbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
Image flatten: 100% complete...done.

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[root@compute01 ~]# rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
Image flatten: 100% complete...done.
6 Q$ W+ W9 `* R+ ^) N[root@compute01 ~]#
8 X" Y1 x! W8 ]& X/ kConnection closed by foreign host.
Disconnected from remote host(192.168.0.75) at 12:08:13.
Type `help' to learn how to use Xshell prompt.
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0 \! H5 J6 s( NLast login: Wed Nov  3 11:25:03 2021 from 192.168.3.28
. l2 R3 I: Y. L( a" }[root@compute01 ~]# rbd snap  remove  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd: snapshot name was not specified
- Z5 q4 R. F; x8 U1 _4 _' o2 i[root@compute01 ~]# rbd ls  images/cceec6e8-29f7-4469-98d1-44131268b88b
0 d% P: M/ g* u) {+ L3 P+ l# Erbd: namespace 'cceec6e8-29f7-4469-98d1-44131268b88b' does not exist.
rbd: listing images failed: (2) No such file or directory
[root@compute01 ~]# rbd info  images/cceec6e8-29f7-4469-98d1-44131268b88b
9 e9 u/ n; m, @) Z/ I. S3 urbd image 'cceec6e8-29f7-4469-98d1-44131268b88b':
3 L3 H; t5 X! X$ l- v size 4 GiB in 512 objects
order 23 (8 MiB objects)
3 I: P4 z6 p0 _: K4 @9 ~( p. w snapshot_count: 1
id: 77979a703ad40e
1 p+ K6 E7 o* Y; P, G2 b block_name_prefix: rbd_data.77979a703ad40e
format: 2
/ \3 w  \& R: x) |: v/ C1 @9 T9 _ features: layering
op_features:
3 V! K3 g2 J1 D) w flags:
5 F5 y' q4 R* N" ~; c5 H( b1 D% o$ S; v create_timestamp: Wed Oct 20 13:43:42 2021
access_timestamp: Wed Nov  3 11:55:36 2021
modify_timestamp: Wed Oct 20 13:43:42 2021
3 p. t8 t0 m& ]5 n[root@compute01 ~]# rbd flatten  images/cceec6e8-29f7-4469-98d1-44131268b88b
Image flatten: 02021-11-03 12:46:57.994 7f1d249e4b00 -1 librbd::Operations: image has no parent
4 A" b9 `, _- e) m5 T! J% {4 T% complete...failed.
# |: K1 L1 `+ e0 t: z, Trbd: flatten error: (22) Invalid argument
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admin

flatten该克隆:

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rbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.

查看快照的克隆
) X# F+ v! @9 ^4 hrbd children {pool-name}/{image-name}@{snapshot-name}



[root@ecos75r018-meijia-31-161 ~]# rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
1.
取消快照保护
% {9 O+ s. [7 Y" Z5 ^; _删除快照前，必须先取消保护。另外，你不可以删除被克隆镜像引用的快照，所以在你删除快照前，必须先摧毁/拍平（flatten）此快照的各个克隆

2 [; S6 F9 r& Q; ^# @# g; f! }* hrbd snap unprotect {pool-name}/{image-name}@{snapshot-name}

[root@ecos75r018-meijia-31-161 ~]# rbd snap unprotect rbd_pool/test_snap_clone@test_snap    2020-10-26 16:07:46.593 7fe6e5ffb700 -1 librbd::SnapshotUnprotectRequest: cannot unprotect: at least 1 child(ren) [1491568ca6d90] in pool 'rbd_pool'    2020-10-26 16:07:46.593 7fe6e5ffb700 -1 librbd::SnapshotUnprotectRequest: encountered error: (16) Device or resource busy    2020-10-26 16:07:46.593 7fe6e5ffb700 -1 librbd::SnapshotUnprotectRequest: 0x55588f39c320 should_complete_error: ret_val=-16    rbd: unprotecting snap failed: (16) Device or resource busy    2020-10-26 16:07:46.595 7fe6e5ffb700 -1 librbd::SnapshotUnprotectRequest: 0x55588f39c320 should_complete_error: ret_val=-16
1.
可以看到该快照下有克隆，无法解除保护，需要先flatten：

1 A& H* E' B' j4 U, n' `/ w 查看快照的克隆:
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  x5 ?. [/ X5 \rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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7 D. z4 v* r! Q2 T3 {) Pflatten该克隆:

; l! Q' ?3 e) e' X. \6 |rbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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7 P  X' ]7 V9 K) E: h/ T继续解除保护：
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rbd snap unprotect rbd_pool/test_snap_clone@test_snap
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拍平克隆镜像
克隆出来的映像仍保留了对父快照的引用。要从子克隆删除这些到父快照的引用，你可以把快照的信息复制给子克隆，也就是“拍平”它。拍平克隆映像的时间随快照尺寸增大而增加。要删除快照，必须先拍平子映像。
8 k7 U4 Z# ~# I
3 V" A0 g' N( `1 I6 v/ Mrbd flatten {pool-name}/{image-name}

* j, l0 M6 z/ U8 jrbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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Note：因为拍平的映像包含了快照的所有信息，所以拍平的映像占用的存储空间会比分层克隆要大
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