Use bind mounts instead of docker volumes. Then you just have normal directories to back up, the same as you would anything else.
this post was submitted on 19 Jun 2023
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This is your answer. It also has the benefit of allowing you to have a nice folder structure for your Docker setup, where you have a folder for each service holding the corresponding compose yaml and data folder(s)
Rsync works fine for most data. (I use borgbackup) For any database data, create a dump using pg_dump or mysqldump or whatever. Then backup the dump and all other volumes but exclude the db volume.
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.
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