bup: Git for backups #bup #28c3
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1 bup: Git for backups #bup #28c3 1 / 26
2 Zoran Computer Science student at TU Darmstadt bup since April / 26
3 toc 1. Motivation 2. Git backgrounds 3. bup 3.1 Features 3.2 Algorithms & data structures 3 / 26
4 Motivation Space efficiency of backups Convenient access to backups Safety against bitrot, filesystem-, and media errors Safety against history changes 4 / 26
5 Git 5 / 26
6 Git Distributed version control system 5 / 26
7 Git Distributed version control system Content addressed 5 / 26
8 Git Distributed version control system Content addressed Immutable objects 5 / 26
9 Git Distributed version control system Content addressed Immutable objects Snapshot- instead of diff-based 5 / 26
10 Git: A Repository 6 / 26
11 Git: A Repository BLOBs Hello World e69de29 6 / 26
12 Git: A Repository BLOBs e69de29 Trees blob 5e1c309dae7f45e0f39b1bf3ac3cd9db12e7d689 README blob 39c8418e04721b9a30232ce754cac8d9ee78340a DESIGN tree 482fa65ae85c1e5bca8c091b479de60b714a4b6a src 82e3a75 6 / 26
13 Git: A Repository BLOBs e69de29 Trees tree a3d703e579dc9baae20456eb63fa49f5e4e7c9b4 author Zoran Zaric <zz@zoranzaric.de> committer Zoran Zaric <zz@zoranzaric.de> Example commit 82e3a75 Commits 3dfe461f 6 / 26
14 Git: A Repository BLOBs d511a245a55a57ca48efe8e67b955dec e69de29 Trees 82e3a75 Commits 3dfe461f Tags & Branches v0.1 master 6 / 26
15 Git: A Repository BLOBs 3dfe461f 82e3a75 e69de29 e69de29 Trees 82e3a75 Commits 3dfe461f Tags & Branches v0.1 master 25b2be3 78af04f 41c28e8 master v1.0 6 / 26
16 Git: A Repository Packfiles e69de29 82e3a75 3dfe461f 41c28e8 78af04f 25b2be3 7 / 26
17 Git: Problems 8 / 26
18 Git: Problems Slow & memory-hungry for bigger files 8 / 26
19 Git: Problems Slow & memory-hungry for bigger files No meta data (permissions, owners, ACLs) 8 / 26
20 bup Avery Pennarun (git subtree, sshuttle, redo) / 26
21 bup: Installation $ sudo apt-get install python2.6-dev python-fuse $ sudo apt-get install python-pyxattr python-pylibacl $ mkdir ~/src && cd ~/src $ git clone $ cd bup $ make $ make test $ sudo make install 10 / 26
22 bup: Examples $ bup index -ux /home/zz $ bup save -n laptop /home/zz $ bup save -r myserver -n laptop /home/zz $ bup on myserver index -ux /home/zz $ bup on myserver save -n server /home/zz $ bup ls laptop/latest/home/zz 11 / 26
23 bup: Features Deduplication ( 12 / 26
24 bup: Features Deduplication ( Benchmark with two servers and a pseudo vm image on them with little changes rsnapshot: 4.97G bup: 2.18G 12 / 26
25 bup: Features Deduplication ( Benchmark with two servers and a pseudo vm image on them with little changes rsnapshot: 4.97G bup: 2.18G Import of rsnapshot backups to bup rsnapshot: 12.6G bup: 4.6G 12 / 26
26 bup: Features Meta data (almost done) Owner Exakt times Permissions Extended ACLs SELinux 13 / 26
27 bup: Features FUSE module You can mount your backups and browse them with your favorite filemanager 14 / 26
28 bup: Features Web interface 15 / 26
29 bup: Features Runs on dd-wrt 16 / 26
30 bup: Features Import-script for rsnapshot backups More will follow (Duplicity) 17 / 26
31 bup: Features Full compatibility with Git Git tools like gitk or tig can be used with bup repositores 18 / 26
32 bup: Features Uses par2 to be save against bitrot, filesystem-, and media-errors 19 / 26
33 bup: Algorithms & Data Structures Hashsplitting Midx Bloom filters 20 / 26
34 Hashsplitting Rolling checksum rsync s algorithm Big files are split in 8kB Chunks (avg) 11 least significant bits of the checksum 1 new chunk 21 / 26
35 Midx idx: indexes for packfiles 1 idx per packfile An object is found with 3-4 lookups per packfile Midx for several packfiles Object is found with 2 lookups Problem: midx have to be recreated for every change 22 / 26
36 Bloom Filters Probabilistic data structure Check if a datum is known Append possible False-positives Rate grows with added data When rate >1% the bloom filter is expanded and rewritten Hash function optimized for few 1s in result Bloom filter is a bitarray; the result is added with bitwise OR When a hit is found a midx-lookup is done 23 / 26
37 Recent Meta data support about to be finished (patchset available, testing needed) Repack patches pending (deleting old backups) inotify based daemon is being discussed 24 / 26
38 You & bup? Python & a bit of C Native Windows support? OSX / Windows meta data support? OSX inotify -like port? GUI? Diff 25 / 26
39 Thank zorzar on freenode & hackint ( & Jabber) zoranzaric.de github.com/zoranzaric gplus.zoranzaric.de Slides: zoranzaric.de/bup-28c3.pdf 26 / 26
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