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Docker - Migrate bind mount to volume mount.md

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HowTo

Docker: Migrate bind mount to volume mount

Assuming we have a container that is storing data on bind mount, proceed as followed:

  • Configure a volume for the container
  • Mount the volume to /mnt/volume
  • Start the container
  • Copy the data from bind mount to volume; e.g. docker cp /usr/share/nextcloud nextcloud01:/mnt/volume
  • Remove bind mount and attach volume instead
  • Start container and check if everything worked properly

Troubleshotting

Permission

After migration you container might not have access to the files. Message like this one show up in the Docker log: You don't have permission to access this resource.

If you have a look at the folders you see that user and group might differ.

root@zeus:/usr/share/nextcloud# ls -ls /var/lib/docker/volumes/nextcloud_data01/_data/
total 152
 4 drwxr-xr-x 33 root     root  4096 Mar 24 11:11 3rdparty
...
root@zeus:/usr/share/nextcloud# ls -ls /usr/share/nextcloud/
total 148
 4 drwxr-xr-x 33 www-data root  4096 Feb 17 22:36 3rdparty
...

Fix the permissions with chown.

docker exec -it nextcloud01 chown -R www-data:root /mnt/volume