this post was submitted on 19 Jun 2023
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Hi all

I'm running several docker containers with local persistent volumes that I would like to backup. I haven't found an easy method to do so.

What do you use / recommend to do that? AFAIK you can't just rsync the volume directory while the container is running.

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[–] easeKItMAn@lemmy.world 1 points 1 year ago

Bind mounts are easy to maintain and backup. However if you share data amongst multiple container docker volumes are recommend especially for managing state.

Backup volumes:

docker run --rm --volumes-from dbstore -v $(pwd):/backup containername tar cvf /backup/backup.tar /dbdata

  • Launch a new container and mount the volume from the dbstore container
  • Mount a local host directory as /backup
  • Pass a command that tars the contents of the dbdata volume to a backup.tar file inside /backup directory.

docker docs - volumes

Database volume backup without stopping the service: bash into the container, dump it, and copy it out with docker cp. Run it periodically via crontab