rbd flatten扁平化镜像

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rbd flatten

rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
9 H: x2 W5 \; vImage flatten: 100% complete...done.


0 Q. ~" m5 t5 S  s. \3 t[root@compute01 ~]# rbd flatten vms/bb78d1b9-fea6-4cc7-b2ae-84178f1bde61_disk
4 R: }7 l% R' D( W# Q) n, ?Image flatten: 100% complete...done.
- z' V( M4 v. t1 D9 R[root@compute01 ~]#
8 \* z5 T. ^' O! H+ B4 |1 vConnection closed by foreign host.
  V3 P$ _9 b# Q. B. ^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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Last login: Wed Nov  3 11:25:03 2021 from 192.168.3.28
# c! [1 E( o8 l: S# }5 i+ k[root@compute01 ~]# rbd snap  remove  images/cceec6e8-29f7-4469-98d1-44131268b88b
' j, |% b) P4 a, arbd: snapshot name was not specified
[root@compute01 ~]# rbd ls  images/cceec6e8-29f7-4469-98d1-44131268b88b
rbd: 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
rbd image 'cceec6e8-29f7-4469-98d1-44131268b88b':
& n; y( D  a- M# M( r. h size 4 GiB in 512 objects
order 23 (8 MiB objects)
snapshot_count: 1
id: 77979a703ad40e
block_name_prefix: rbd_data.77979a703ad40e
format: 2
2 j) \/ I8 |  b% B* ]! y features: layering
op_features:
flags:
  o, K, r1 l4 E1 _: r5 z1 v create_timestamp: Wed Oct 20 13:43:42 2021
access_timestamp: Wed Nov  3 11:55:36 2021
) {0 P8 I% ^0 t& f0 ]% `) | modify_timestamp: Wed Oct 20 13:43:42 2021
[root@compute01 ~]# rbd flatten  images/cceec6e8-29f7-4469-98d1-44131268b88b
2 \( `2 q: f. b- r2 E9 ^Image flatten: 02021-11-03 12:46:57.994 7f1d249e4b00 -1 librbd::Operations: image has no parent
" a8 a$ q0 M+ q% complete...failed.
$ O; p/ _3 i+ J1 B  Q% Lrbd: 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.

7 M) f7 `# K( t  n+ s3 r, u8 V查看快照的克隆
rbd children {pool-name}/{image-name}@{snapshot-name}



[root@ecos75r018-meijia-31-161 ~]# rbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
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& w, i" v+ f2 s3 A$ @) q取消快照保护
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
% s% _6 z# `! H5 s  N* d2 {
8 r8 V" g5 C! Q8 M- \$ O" B' z% Zrbd snap unprotect {pool-name}/{image-name}@{snapshot-name}
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8 N  u# w7 U% c. l# v% F5 w) 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.
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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 查看快照的克隆:

  G& ]8 Z7 m0 Y* [. ]# D" krbd children rbd_pool/test_snap_clone@test_snaprbd_pool/test_clone
, J6 m# \; e# q1.
flatten该克隆:
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rbd 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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& _6 h3 R7 r" f3 c9 E9 @拍平克隆镜像
  a) Y2 H, T7 e  a$ k8 w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}
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3 S1 g- ?* w" l2 I% Trbd flatten rbd_pool/test_cloneImage flatten: 100% complete...done.
1.
. V9 n( i6 V3 G& l) ~7 p* E! 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
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