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Laurent GUERBY, 04/28/2016 11:39 PM

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{{>toc}}
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h1. Backup
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h2. Liens
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* [[Backup_infra]]
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* [[Apt_Backports_TTNN]] borg debian packaging
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* https://www.reddit.com/r/linux/comments/42feqz/i_asked_here_for_the_optimal_backup_solution_and/
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h2. BackupPC
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* http://backuppc.sourceforge.net/
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h2. Attic
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* https://attic-backup.org/
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* https://lists.tetaneutral.net/pipermail/technique/2015-September/001971.html
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** Logiciel de backup : choix de attic
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h2. Borg
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* https://github.com/borgbackup
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* http://readthedocs.org/projects/borgbackup/
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* http://puppet.tetaneutral.net/pool/main/b/borgbackup/
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* http://puppet.tetaneutral.net/dists/
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h2. Borg script
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*Note 20160428* : le script est probablement inutile cf https://github.com/borgbackup/borg/issues/994
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Pour une machine qui va etre eteinte et rallumée de maniere non controlable.
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Creation initiale avec un user normal capable de ssh sur MACHINE:PORT :
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<pre>
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borg init --encryption keyfile ssh://USER@MACHINE:PORT/some/where/borg/NICK-repo
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</pre>
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Et setup cron + script :
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<pre>
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# crontab -l
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@reboot /root/cron-borg.sh
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# cat /root/cron-borg.sh
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#!/bin/bash
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export LANG=en_US.UTF-8
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mkdir -p /root/borg >& /dev/null
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sleep 300
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echo === start === $(date) >> /root/borg/cron.log
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NICK=myhost
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REPO=ssh://USER@MACHINE:PORT/some/where/borg/${NICK}-repo
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export BORG_PASSPHRASE=lalalala
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if [ -f /root/borg/stamp ]; then
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    STAMP=$(cat /root/borg/stamp)
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    borg break-lock $REPO
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else
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    STAMP=$(date '+%Y%m%dT%H%M%S')
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    if [ -f /root/borg/previous-stamp ]; then
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	  PREVIOUS_STAMP=$(cat /root/borg/previous-stamp)
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	  while [ "${STAMP%T*}" = "${PREVIOUS_STAMP%T*}" ]; do
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              STAMP=$(date '+%Y%m%dT%H%M%S')
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              echo === delay === $(date) >> /root/borg/cron.log
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	      sleep 1h
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	  done
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    fi
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    echo $STAMP > /root/borg/stamp
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fi
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borg create --compression lz4 --stats --verbose \
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   --exclude /root/borg --exclude '/home/*/.cache' --exclude-caches --one-file-system \
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   ${REPO}::${NICK}-$STAMP / >> /root/borg/log-$STAMP 2>> /root/borg/err-$STAMP
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res=$?
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if [ $res -eq 0 -o $res eq 1 ]; then
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    mv -f /root/borg/stamp /root/borg/previous-stamp >& /dev/null
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    rm -f /root/borg/stamp >& /dev/null
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fi
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echo === done === $res === $(date) >> /root/borg/cron.log
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exec "$0"
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</pre>
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h2. Migration Attic vers Borg
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* https://github.com/borgbackup/borg/pull/231
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* old: https://chiliproject.tetaneutral.net/projects/git-tetaneutral-net/repository/puppet-backup
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* new: https://chiliproject.tetaneutral.net/projects/git-tetaneutral-net/repository/puppetmaster/revisions/master/entry/modules/ttnn/manifests/backup.pp
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** git history BackupPC => Attic => Borg
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<pre>
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# apt-get -t jessie-backports install borgbackup
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$ cd /backup/attic/
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$ borg upgrade <repo>
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$ borg check --repair <repo>
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$ mv <repo> ../borg/
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$ chown -R backupinfra: /backup/borg/<repo>
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</pre>
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Dans le module puppet, le changement le plus important est le parametre compression explicite pour correspondre au défaut de attic create :
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<pre>
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attic create ... <repo> -> borg create --compression zlib,6 ... <repo>
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</pre>
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Sinon le prochain backup sera non compressé, et aucun nouveau chucks ne correspondra aux anciens -> perte de la dedup. "zlib,6" étant le niveau de compression de attic.
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https://github.com/jborg/attic/issues/299
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http://borgbackup.readthedocs.org/en/stable/usage.html#environment-variables
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<pre>
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export ATTIC_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=yes
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</pre>