rbd flatten扁平化镜像

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rbd flatten

0 p2 X. l0 n: Z/ Y0 R6 Hrbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
Image flatten: 100% complete...done.

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; z9 n, X8 C1 _% k1 e; U3 n0 B[root@compute01 ~]# rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
, v3 E( |; Y7 ?* p$ C% UImage flatten: 100% complete...done.
8 [) j  a& O+ J. r5 r3 i[root@compute01 ~]#
: O+ W6 a' e5 s, JConnection 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.


Last 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
6 y* e+ s4 u' u$ a; x+ O) d[root@compute01 ~]# rbd ls  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd: namespace 'cceec6e8-29f7-4469-98d1-44131268b88b' does not exist.
4 }  d  d2 g- i. x# trbd: listing images failed: (2) No such file or directory
[root@compute01 ~]# rbd info  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd image 'cceec6e8-29f7-4469-98d1-44131268b88b':
size 4 GiB in 512 objects
* a9 ^5 Y, A2 R- E4 z order 23 (8 MiB objects)
snapshot_count: 1
+ O2 _1 Z- X+ b id: 77979a703ad40e
+ I. c- ]# `( j7 C6 H* K block_name_prefix: rbd_data.77979a703ad40e
format: 2
1 [, l4 o  q! [( r- G# m# h/ { features: layering
op_features:
8 _, F3 R/ [2 \* T3 s5 T$ a1 M flags:
+ o' V3 Y, q1 Y- F create_timestamp: Wed Oct 20 13:43:42 2021
( W9 f5 _5 o+ A4 t& ~( _) ^ access_timestamp: Wed Nov  3 11:55:36 2021
( \8 e: k+ f. |. E modify_timestamp: Wed Oct 20 13:43:42 2021
[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
% complete...failed.
+ ?1 d8 ^3 e4 E  s9 b' Arbd: flatten error: (22) Invalid argument
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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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查看快照的克隆
rbd children {pool-name}/{image-name}@{snapshot-name}
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: ~5 |: g7 N  a2 M/ e[root@ecos75r018-meijia-31-161 ~]# rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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( q- E3 k0 ~8 N0 L. Y& {4 [取消快照保护
/ t6 e- k* F3 \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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rbd 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：
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% L  D! b- j6 _# o3 ?7 n 查看快照的克隆:

' z$ w, g' y! B, G3 ~: Krbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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flatten该克隆:
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' A8 ?' p7 @0 Mrbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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4 f7 ?8 l2 V# ~! w8 f& }6 ]继续解除保护：
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. P. e/ C5 f9 M( z  K$ S) G8 ^rbd snap unprotect rbd_pool/test_snap_clone@test_snap
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6 V) A! J3 G1 D7 I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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0 N; _& M+ V% Krbd flatten {pool-name}/{image-name}

rbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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3 s% J# t! w& {2 l2 c" v8 c, cNote：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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