rbd flatten扁平化镜像

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rbd flatten

rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
8 S! q* M! u) y5 v+ bImage flatten: 100% complete...done.
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[root@compute01 ~]# rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
! b/ |8 M8 F- f  ^9 K2 s3 }Image flatten: 100% complete...done.
[root@compute01 ~]#
Connection 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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/ f2 L/ b1 X$ Y: lLast login: Wed Nov  3 11:25:03 2021 from 192.168.3.28
( f( N" X# C2 B3 Z9 ^0 h. ~% F[root@compute01 ~]# rbd snap  remove  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd: snapshot name was not specified
[root@compute01 ~]# rbd ls  images/cceec6e8-29f7-4469-98d1-44131268b88b
" C: D4 d& s! t5 Urbd: namespace 'cceec6e8-29f7-4469-98d1-44131268b88b' does not exist.
1 E6 s2 ?2 n+ V* T# F4 l0 t& Trbd: listing images failed: (2) No such file or directory
. V6 @, Q# }1 k, n; N) l7 q[root@compute01 ~]# rbd info  images/cceec6e8-29f7-4469-98d1-44131268b88b
( `# [5 k$ Y7 z) W4 _rbd image 'cceec6e8-29f7-4469-98d1-44131268b88b':
size 4 GiB in 512 objects
( S6 [9 E- ~3 N2 X order 23 (8 MiB objects)
; y: p; R& R6 D snapshot_count: 1
id: 77979a703ad40e
block_name_prefix: rbd_data.77979a703ad40e
" `. E# Q* w( z3 p/ T( S* J2 n% T format: 2
features: layering
op_features:
flags:
/ e  @2 |( M" H/ Y- X: |1 E create_timestamp: Wed Oct 20 13:43:42 2021
' i+ ~4 G1 N3 }- f$ B  o7 A 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
Image flatten: 02021-11-03 12:46:57.994 7f1d249e4b00 -1 librbd::Operations: image has no parent
% complete...failed.
, ]9 P& j4 w8 M5 D( [% Trbd: 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.

查看快照的克隆
; w9 }- C, q) Irbd 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
1.
取消快照保护
' @3 \8 H- v; A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

rbd snap unprotect {pool-name}/{image-name}@{snapshot-name}
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4 g4 I& _: W( p9 ^5 K[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.
$ I7 b* ~0 x  [, v4 P- `& {3 ?6 d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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3 G% C9 L* V4 C$ k% x4 E) s 查看快照的克隆:
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rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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flatten该克隆:

( H' A1 u! b1 S. zrbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
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继续解除保护：
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rbd snap unprotect rbd_pool/test_snap_clone@test_snap
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* G$ Q; H% r' v0 |5 W$ ^拍平克隆镜像
) r0 F1 f3 u: [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。

3 y6 Y. Z* h4 I! n8 \& a6 Nrbd flatten {pool-name}/{image-name}

rbd 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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