rbd flatten扁平化镜像

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rbd flatten
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rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
% D2 R0 e/ p) zImage flatten: 100% complete...done.

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[root@compute01 ~]# rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
Image flatten: 100% complete...done.
[root@compute01 ~]#
6 y; c4 U% q' ^4 i) R- Y! T- {! mConnection closed by foreign host.
Disconnected from remote host(192.168.0.75) at 12:08:13.
9 m2 ~# x1 D1 A  l" iType `help' to learn how to use Xshell prompt.

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. T, L6 x+ s& H0 q; rLast login: Wed Nov  3 11:25:03 2021 from 192.168.3.28
[root@compute01 ~]# rbd snap  remove  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd: snapshot name was not specified
( K% C5 I* r4 h1 W5 @[root@compute01 ~]# rbd ls  images/cceec6e8-29f7-4469-98d1-44131268b88b
- z' C' T  B- x* Hrbd: namespace 'cceec6e8-29f7-4469-98d1-44131268b88b' does not exist.
+ d9 c- \5 J3 Grbd: listing images failed: (2) No such file or directory
9 L3 O) g) ^/ d. z[root@compute01 ~]# rbd info  images/cceec6e8-29f7-4469-98d1-44131268b88b
# L( Y' X( u/ r7 b; R6 `rbd image 'cceec6e8-29f7-4469-98d1-44131268b88b':
size 4 GiB in 512 objects
order 23 (8 MiB objects)
3 L& G1 f0 n; a* x snapshot_count: 1
7 |6 B7 Z- Y0 I3 B) U1 J4 n8 Y, h id: 77979a703ad40e
  A0 Y: ^- c$ E( P" R0 g+ S7 q: M block_name_prefix: rbd_data.77979a703ad40e
& a. q; Q. H; y/ O" S( b9 u; d  q$ g7 Z format: 2
features: layering
op_features:
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% G4 f+ h' ?. P7 J% A create_timestamp: Wed Oct 20 13:43:42 2021
4 Q, k: U8 R% }+ h% e) F, e0 u! G access_timestamp: Wed Nov  3 11:55:36 2021
modify_timestamp: Wed Oct 20 13:43:42 2021
[root@compute01 ~]# rbd flatten  images/cceec6e8-29f7-4469-98d1-44131268b88b
8 n; j  l: A0 x  J% A- p3 f! y! UImage flatten: 02021-11-03 12:46:57.994 7f1d249e4b00 -1 librbd::Operations: image has no parent
2 Z. P# o" R" Z+ {8 j% complete...failed.
! W! m( p9 t# v9 mrbd: flatten error: (22) Invalid argument

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flatten该克隆:
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4 r% Z. K" U3 ~# e+ krbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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查看快照的克隆
rbd children {pool-name}/{image-name}@{snapshot-name}
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[root@ecos75r018-meijia-31-161 ~]# rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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" ~! {1 Y8 D( a8 [5 r# v5 C% {$ |取消快照保护
; d+ p+ ^8 Q; o  x# f) ^* p$ w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
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: t/ O3 r, m4 wrbd snap unprotect {pool-name}/{image-name}@{snapshot-name}
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3 ]" X1 P, S$ F( R. D4 q2 A[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
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! g8 A* s, Z1 M可以看到该快照下有克隆，无法解除保护，需要先flatten：

+ J9 ^$ I& W. O. Z 查看快照的克隆:

rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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flatten该克隆:
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rbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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: H, Q9 P' J9 C$ @7 \7 I继续解除保护：

/ d& U: z" V$ P! \. crbd 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。
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rbd flatten {pool-name}/{image-name}

! r1 J$ q6 u7 v8 U2 B/ w7 prbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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3 ]6 y+ T: Z" t% Z5 |8 d# aNote：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