docker bind mounts sometimes empty

henfri

1/9/24, 3:52 PM

I am using a docker container with this definition:

  webserver:
    image: ghcr.io/paperless-ngx/paperless-ngx:latest
    volumes:
      - /srv/dev-disk-by-id-ata-Micron_1100_MTFDDAV256TBN_17501A32891E-part3/dockerconfig/paperless/data:/usr/src/paperless/data
      - /srv/dev-disk-by-label-DataPool1/Paperless/paperless_ng_media:/usr/src/paperless/media
      - /srv/dev-disk-by-label-DataPool1/Paperless/export:/usr/src/paperless/export
      - /srv/dev-disk-by-label-DataPool1/Paperless/consume:/usr/src/paperless/consume

Sometimes, unfortunately, the content of /usr/src/paperless/media inside the container is empty. All files created now endup inside the container and not in the bind mount.

Restarting the container usually helps. I have not observed any errors in journalctl -u docker docker inspect correctly shows:

        "HostConfig": {
            "Binds": [
                "/srv/dev-disk-by-label-DataPool1/Paperless/paperless_ng_media:/usr/src/paperless/media:rw",
                "/srv/dev-disk-by-label-DataPool1/Paperless/export:/usr/src/paperless/export:rw",
                "/srv/dev-disk-by-label-DataPool1/Paperless/consume:/usr/src/paperless/consume:rw",
                "/srv/dev-disk-by-id-ata-Micron_1100_MTFDDAV256TBN_17501A32891E-part3/dockerconfig/paperless/data:/usr/src/paperless/data:rw"
            ],

There is not much special with the folder /srv/dev-disk-by-label-DataPool1/Paperless/paperless_ng_media except that it is a btrfs subvolume:

/dev/sdc1 on /srv/dev-disk-by-label-DataPool1 type btrfs 
/dev/sdc1 on /srv/dev-disk-by-label-DataPool1/Paperless type btrfs (rw,noatime,space_cache=v2,subvolid=1385,subvol=/Paperless)```

I am out of ideas..
Do you have any?

Best regards,
Hendrik

321

0 + 2

bind

mount

docker

mmv-ru

1/9/24, 4:12 PM

Just guesses, there no permissions or Selinux (or Apparmor) problem?

henfri

1/13/24, 7:43 PM

The problem is coming (without container restart) and going (with container restart). So, it cannot be permissions. How would I track town Selinux or Apparmor problems?

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