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发表于 2022-7-20 13:38:27
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8 h, A% K, }; \ 创建云盘volume-id，大小为1G8 x& z3 j, r+ p3 n# }7 Z* X/ G
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()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd create volumes/volume-id --size 1G& m* C. i" l0 H6 v2 o' V
()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l volumes |grep volume-id
6 ?! M2 J8 G l/ R/ `1 c2 x- lvolume-id 1GiB 2
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2. 先尝试进行diff store， 创建backups中的base盘+ {! Q/ k' s# C* [) T
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()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd create backups/volume-volume-id.backup.base --size 1G! Z2 m* F* |( G6 U2 C" L% K
()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l backups
* E! j8 A) C; s K/ TNAME SIZE PARENT FMT PROT LOCK
! ? c5 ?' i, x3 q+ Kvolume-volume-id.backup.base 1GiB 2
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3. 创建volume-id快照1，命名规则如下
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% A% ^# c: y% Y2 W9 s()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd snap create volumes/volume-id@backup.backup-id.snap.time1
5 ^; K! c3 B' ~& x()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l volumes |grep volume-id7 X5 ^& A# X% j; r+ i
volume-id 1GiB 2 ; O& E4 K5 C( M+ H1 ]- ?
volume-id@backup.backup-id.snap.time1 1GiB 2 ) p1 K' m8 u6 o' w4 b0 `
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4. 导出云盘和快照1的差异11 b, |/ a5 O. K9 s
# z' l: J$ V7 p# U( J# t9 N' @0 R()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd export-diff volumes/volume-id@backup.backup-id.snap.time1 test_diff_snap_time1
9 ^7 H% X4 t( OExporting image: 100% complete...done.
/ E7 f4 x, ]: ^& ~) Y& `()[root@busybox-openstack-f7bcf88-hgdkz /]# ls
0 K3 E6 o0 K' p! X0 w$ Vtest_diff_snap_time1 $ Y2 U% _6 p' y* C* n
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" g+ b/ d0 T) h d5. 将差异1导入到backups的base盘中，此时base盘生成了一个快照
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( l8 ~- a" {6 m* N' Y- @()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd import-diff test_diff_snap_time1 backups/volume-volume-id.backup.base
& @ f" f6 _( G1 D# V8 Z; u! |: e+ JImporting image diff: 100% complete...done.8 a* h& D7 i" w9 y
()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l backups1 B; n- I; T% b# s4 D5 L
NAME SIZE PARENT FMT PROT LOCK
% j, G9 ]# m$ V; t8 ?4 hvolume-volume-id.backup.base 1GiB 2
! F- o5 n' l) |) [4 k. y8 lvolume-volume-id.backup.base@backup.backup-id.snap.time1 1GiB 2 / ?$ `9 U9 X4 X6 K( ^8 x; t
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6 @4 A/ x$ H; U8 z6. 第二次做增量备份时， 创建volume-id新的快照2 k( K2 L7 f4 N+ H7 m4 M
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()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd snap create volumes/volume-id@backup.backup-id2.snap.time2
6 @0 D* c8 v- |( f( E& M8 H1 b()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l backups8 U& \+ Z. H! ^ t
NAME SIZE PARENT FMT PROT LOCK
* ^3 C, \" G3 T5 V: _6 r# d! tvolume-volume-id.backup.base 1GiB 2
# c5 V7 |+ _* e: {+ V. xvolume-volume-id.backup.base@backup.backup-id.snap.time1 1GiB 2 8 ~ z7 C, `. S& L& x# J
()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l volumes |grep volume-id
" ^# Y" v# f% _( t/ D8 K- Q/ J: cvolume-id 1GiB 2 6 C. \8 H# |4 F8 j
volume-id@backup.backup-id.snap.time1 1GiB 2 ! @2 j) y/ ^$ P2 q
volume-id@backup.backup-id2.snap.time2 1GiB 2 + W& c. u% b. @
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7. 导出快照1和快照2的差异2/ f. b' C4 O2 X2 E D7 V v
% r# U2 D/ T! b# H( }( N- f1 Q()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd export-diff --snap backup.backup-id.snap.time1 volumes/volume-id@backup.backup-id2.snap.time2 test_diff_snap_time1_time2
/ Z2 v# U0 n* W4 l! e, V- o, x8 s8 q4 D7 OExporting image: 100% complete...done.$ [6 M) E' Q9 Y) k
1 ^0 s9 \+ a5 }$ v4 a, w/ @' I4 C8. 将差异2导入backups的base盘，此时base盘又生成了一个新的快照7 ~8 n) o* ?+ i4 C: ~0 p
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()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd import-diff test_diff_snap_time1_time2 backups/volume-volume-id.backup.base5 T) [8 B( Z$ }. ] k2 |
Importing image diff: 100% complete...done.
' V2 c) Q6 C: o1 W8 Q4 D! c()[root@busybox-openstack-f7bcf88-hgdkz /]# rbd ls -l backups
/ C$ r' k- m) }NAME SIZE PARENT FMT PROT LOCK ' Z1 i; o1 ~! |) p7 F
volume-volume-id.backup.base 1GiB 2
+ i, p0 e2 M/ m9 `8 X) _9 zvolume-volume-id.backup.base@backup.backup-id.snap.time1 1GiB 2
$ ]' W q4 b# T) [. wvolume-volume-id.backup.base@backup.backup-id2.snap.time2 1GiB 2
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, p# v7 M; d. q* W5 F% ?: b0 U, L3 p7 y9. 删除volume-id的快照1
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10. 如果diff store出现异常， 会通过full store来备份， 通过将云盘按照chunk=128M分片拷贝数据到新的云盘。
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11. 备份元数据- w+ r& ]0 ~3 j( J, u( ^6 A2 Y" \
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三 RBD恢复备份的实现：
) H8 H' c7 j/ K8 x) S1 先检查是否满足diff restore, 需要满足下面条件0 L5 W3 r( Y" w# `8 Q3 h
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check can diff restore:. [ @1 n- u% V- c3 O1 |! [0 B$ i
1 base exist: backups/volume-volume-id.backup.base
& ^. O' X5 x" j2 restore point snapshot exist: backups/volume-volume-id.backup.base@backup.backup-id.snap.time13 u7 R0 ^" |& ^/ F: i+ r
3 volume file is rbd
1 K. u3 l2 i2 O* b4 backup[volume_id] != new volume_id
' H7 @8 K( w8 s+ B5 rbd volume has no extents (extend)
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2. 如果满足diff restore条件， 先导出对应backup-id的差异" d2 k: s: G" G% s
3 P/ \ n6 M* j# B6 O()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd export-diff backups/volume-volume-id.backup.base@backup.backup-id1.snap.time1 test_diff_backup_id2
/ `, _( W! `/ L+ y0 N5 bExporting image: 100% complete...done.. w$ K: N* r" `- s& m
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3. 将对应backup-id的差异导入new-volume-id
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! O& G/ o6 n8 S' I0 B: q4 Q) N; E()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd import-diff test_diff_backup_id2 volumes/new-volume-id5 ]- f# L7 t6 [5 r' n9 g0 A
Importing image diff: 100% complete...done.
1 R7 R$ r0 a3 A" U. f+ _()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd ls -l volumes" [% ~" E) G; E# h$ e
NAME SIZE PARENT FMT PROT LOCK
4 v n" g2 j% y) @# d( U( znew-volume-id 1GiB 2 0 e/ x% }, l2 E# \5 o: V
new-volume-id@backup.backup-id1.snap.time1 1GiB 2 8 G5 ]) ~( k1 t' `; H% g3 {
volume-id 1GiB 2 # Y5 W4 S& l4 ~# b) d# N4 g
volume-id@backup.backup-id1.snap.time1 1GiB 2 # Q3 S; ^. D. F9 A; D
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9 l y2 n# F8 O) s4. 如果new volume的大小与备份的大小不一致，导入差异后需要resize。
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()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd create volumes/new-volume-id2 --size 2G) a5 _3 v. @; E7 c
()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd import-diff test_diff_backup_id2 volumes/new-volume-id2
8 |! ?( P$ r( y9 C- T% E2 @+ c2 Y9 NImporting image diff: 100% complete...done.9 W: G# F, y+ T) u
()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd ls -l volumes
}9 @& t' s2 o0 Y. v! o) p; G2 [9 ~NAME SIZE PARENT FMT PROT LOCK
" ^) z/ b% Y7 knew-volume-id 1GiB 2
4 a/ \, f/ A- w4 r* hnew-volume-id@backup.backup-id1.snap.time1 1GiB 2 ; I/ m8 Z) |' J0 |( k* h5 V
new-volume-id2 1GiB 2 ) _3 R* w2 g/ S
new-volume-id2@backup.backup-id1.snap.time1 1GiB 2 1 K7 y$ u+ {+ ]( q8 r
volume-id 1GiB 2
' l4 f6 `6 ^ dvolume-id@backup.backup-id1.snap.time1 1GiB 2
+ X# I3 |7 |2 a6 j. ?2 U()[root@busybox-openstack-5c687fdc9-mpwjd /]# . j+ E B( |' `9 s4 q
()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd resize volumes/new-volume-id2 --size 2G: ^" X3 x/ l5 s# q5 L" s
Resizing image: 100% complete...done.
6 i" g' ~, X" a# |- V) m()[root@busybox-openstack-5c687fdc9-mpwjd /]# rbd ls -l volumes
" E& ^2 `4 M! X4 N+ D# V* X% DNAME SIZE PARENT FMT PROT LOCK
5 V q, d( v) |) i: W6 jnew-volume-id 1GiB 2 1 ~. m4 J8 b6 B$ l* {. B6 V
new-volume-id@backup.backup-id1.snap.time1 1GiB 2 9 u4 |9 L/ G! T! x# D2 ]) |
new-volume-id2 2GiB 2
: L* P( m. q: c* j" g% L; H0 Xnew-volume-id2@backup.backup-id1.snap.time1 1GiB 2 $ s( V/ a; N7 s9 H; f
volume-id 1GiB 2
6 {7 W7 A m2 y7 D( ?* yvolume-id@backup.backup-id1.snap.time1 1GiB 2 $ |. F- F4 \1 a+ X
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5. 如果不满足diff restore条件，或者在diff restore过程中出现异常，进行full restore， 通过将云盘按照chunk=128M分片拷贝数据到新的云盘。
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6. 恢复元数据 |
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