Bkctld (aka evobackup)
Bkctld is a shell script to create and manage a backup server which will handle the backup of many servers (clients). Licence is AGPLv3.
The main principle uses SSH chroot (called "jails" in the FreeBSD world) for each client to backup. Each client will upload his data every day using rsync in his chroot (using root account). Incrementals are stored outside of the chroot using hard links or btrfs snapshots. (So incrementals are not available for clients). Using this method we can keep tens of backup of each client securely and not using too much space.
Backup server ************ Server 1 ------ SSH/rsync -------> * tcp/2222 * * * Server 2 ------ SSH/rsync -------> * tcp/2223 * ************
This method uses standard tools (ssh, rsync, cp -al, btrfs subvolume). EvoBackup is used for many years by Evolix for back up each day hundreds of servers which uses many terabytes of data.
bkctld was test on Debian Jessie. It can be compatible with other Debian version or derivated distribution like Ubuntu or Debian Wheezy.
A big size volume must be mount on /backup, we recommend usage of btrfs for subvolume and snapshot fonctionnality. This volume can be encrypted by luks for security reason.
A Debian package is available in Evolix repository
echo "http://pub.evolix.net/ jessie/" >> /etc/apt/sources.list apt update apt install bkctld
Chroot jail use part of this package
apt install bash coreutils sed dash mount rsync openssh-server openssh-sftp-server libc6-i386 libc6
Install cron for incremental backup
Edit root crontab
Add this ligne
30 10 * * * /usr/sbin/bkctld inc && /usr/sbin/bkctld rm
Notes : If you want mutiples backups in a day (1 by hour maximum) you can run
bkctld incmultiples times If you want keep incremental backup for ever, you just need don't run
You can deploy tests environmments with Vagrant :
Launch rsync-auto in a terminal for automatic synchronisation of your local code with Vagrant VM :
You can run bats test with test provisionner :
vagrant provision --provision-with test
Man page, in roff language, can be generated with pandoc :
pandoc -f markdown -t man usage.md --template default.man -V title=bkctld -V section=8 -V date="$(date '+%d %b %Y')" -V footer="$(git describe --tags)" -V header="bkctld man page"
You can save various systems on evobackup jail : Linux, BSD, Windows, MacOSX. Only prequisites is rsync command.
rsync -av -e "ssh -p SSH_PORT" /home/ root@SERVER_NAME:/var/backup/home/
An example script is present in zzz_evobackup, clone evobackup repo and read CLIENT CONFIGURATION section of the manual.
git clone https://forge.evolix.org/evobackup.git cd evobackup man ./docs/bkctld.8