{{>toc}}

h1. Backup

h2. 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/

h2. BackupPC

* http://backuppc.sourceforge.net/

h2. Attic

* https://attic-backup.org/

* https://lists.tetaneutral.net/pipermail/technique/2015-September/001971.html

** Logiciel de backup : choix de attic

h2. Borg

* https://github.com/borgbackup

* http://readthedocs.org/projects/borgbackup/

* http://puppet.tetaneutral.net/pool/main/b/borgbackup/

* http://puppet.tetaneutral.net/dists/

h2. 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 :

<pre>

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

</pre>

Et setup cron + script :

<pre>

# 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

</pre>

h2. 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

<pre>

# 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>

</pre>

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

<pre>

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

</pre>

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

<pre>

export ATTIC_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=yes

</pre>