You could just have a dedicated backup user that is in all the groups of you docker volumes.
this post was submitted on 26 Nov 2023
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This might be a good idea. It would only work for files that allow read access for the group, but that should be fine
Add the DAC_READ_SEARCH capability to the restic binary (using setcap).This is what allows to read all files. Obviously this means being able to read all, all, files including shadow etc.
This is a great hint, thank you. I just discovered that the official restic docs recommend this method too
Thank you!
You didn't mention how big those volumes are and how frequently the data changes.
Assuming it's not that much data:
- use
tarto archive each volume first, while using proper options to preserve permissions and whatever else is important for your usecase - use restic to backup those archives
- use a proper pruning strategy to not let your backups get too big:
- I'm not that familiar with
restic, but maybe you can backup those archives separately and apply a more aggressive pruning strategy just for them - simply might be needed, cause deduplication (AFAIK) might not be that great with backing up archives
- but maybe if the volume data and the resulting archive doesn't change that often, deduplication would be sufficient even with a not so aggressive pruning strategy
- I'm not that familiar with
Restic uses smart Delta backups, creating a tar before the restic process would defeat the purpose. The permission issue is the same, as I need to have access to the Files either way.