• Contenu
• Backup
  • Liens
  • BackupPC
  • Attic
  • Borg
  • Borg script
  • Migration Attic vers Borg

Backup¶

Liens¶

• Backup_infra
• Apt_Backports_TTNN borg debian packaging
• https://www.reddit.com/r/linux/comments/42feqz/i_asked_here_for_the_optimal_backup_solution_and/

BackupPC¶

• http://backuppc.sourceforge.net/

Attic¶

• https://attic-backup.org/
• https://lists.tetaneutral.net/pipermail/technique/2015-September/001971.html
  • Logiciel de backup : choix de attic

Borg¶

• https://github.com/borgbackup
• http://readthedocs.org/projects/borgbackup/
• http://puppet.tetaneutral.net/pool/main/b/borgbackup/
• http://puppet.tetaneutral.net/dists/

Borg script¶

Pour une machine qui va etre eteinte et rallumée de maniere non controlable.

Creation initiale avec un user normal capable de ssh sur MACHINE:PORT :

borg init --encryption keyfile ssh://USER@MACHINE:PORT/some/where/borg/NICK-repo

Et setup cron + script :

# crontab -l
@reboot /root/cron-borg.sh

# cat /root/cron-borg.sh
#!/bin/bash
export LANG=en_US.UTF-8
mkdir -p /root/borg >& /dev/null

sleep 300
echo === start === $(date) >> /root/borg/cron.log

NICK=myhost
REPO=ssh://USER@MACHINE:PORT/some/where/borg/${NICK}-repo
export BORG_PASSPHRASE=lalalala

if [ -f /root/borg/stamp ]; then
    STAMP=$(cat /root/borg/stamp)
    borg break-lock $REPO
else
    STAMP=$(date '+%Y%m%dT%H%M%S')
    if [ -f /root/borg/previous-stamp ]; then
      PREVIOUS_STAMP=$(cat /root/borg/previous-stamp)
      if [ "${STAMP%T*}" = "${PREVIOUS_STAMP%T*}" ]; then
              echo === delay === $(date) >> /root/borg/cron.log
          exit 0
      fi
    fi
    echo $STAMP > /root/borg/stamp
fi

borg create --compression lz4 --stats --verbose --exclude /root/borg --exclude-caches --one-file-system ${REPO}::${NICK}-$STAMP / >> /root/borg/log-$STAMP 2>> /root/borg/err-$STAMP

if [ $? -eq 0 ]; then
    mv -f /root/borg/stamp /root/borg/previous-stamp >& /dev/null
    rm -f /root/borg/stamp >& /dev/null
fi

echo === done === $(date) >> /root/borg/cron.log

Migration Attic vers Borg¶

• https://github.com/borgbackup/borg/pull/231
• old: https://chiliproject.tetaneutral.net/projects/git-tetaneutral-net/repository/puppet-backup
• new: https://chiliproject.tetaneutral.net/projects/git-tetaneutral-net/repository/puppetmaster/revisions/master/entry/modules/ttnn/manifests/backup.pp
  • git history BackupPC => Attic => Borg

# apt-get -t jessie-backports install borgbackup
$ cd /backup/attic/
$ borg upgrade <repo>
$ borg check --repair <repo>
$ mv <repo> ../borg/
$ chown -R backupinfra: /backup/borg/<repo>

Dans le module puppet, le changement le plus important est le parametre compression explicite pour correspondre au défaut de attic create :

attic create ... <repo> -> borg create --compression zlib,6 ... <repo>

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.

https://github.com/jborg/attic/issues/299
http://borgbackup.readthedocs.org/en/stable/usage.html#environment-variables

export ATTIC_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=yes