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Posts about backups

Docker Volume Backups

DOCKER

Backups are always an issue. I plan to switch to ZFS for the snapshotting and remote sync features, until then I have take the useful volume-backup and broken it until it works with rdiff-backup

Build the container

First you have to clone the repo and build the container

git clone https://github.com/dugite-code/volume-backup.git
cd volume-backup
docker image build -t vbackup:1.0 .

Backup

Now you can run the container mounting the [volume-name] at /volume and your [backup-dir] at /backup

docker run -v [volume-name]:/volume -v [backup-dir]:/backup --rm vbackup:1.0 backup

Additional rdiff-backup options and be passed via the -o switch and a quoted option for example -o "--exclude ignore.me"

Restore

To restore you must supply some form of options i.e. -o "-r 10D" or restore backup from 10 Days ago

docker run -v [volume-name]:/volume -v [backup-dir]:/backup --rm vbackup:1.0 restore -o "-r 10D"

Trimming old files

With incremental backups it's important to occasionally trim old files that just don't exist anymore. Like Restore you must provide some form of option.

Prior to doing a backup I will run this command to remove files older than 20 Backups

docker run -v [backup-dir]:/backup --rm vbackup:1.0 remote -v -o "--remove-older-than 20B"

I hope you found this helpful. It's not a very clean script, I had to hack apart the reference script quite a bit in order to get it all working. But it serves it's purpose quite well.