Permission Denied When Writing Backups to NFS Volume Despite Correct UID/GID Configuration #415
Description
Summary
When using an NFS-mounted volume as the backup destination, the container consistently fails with permission denied errors when attempting to write backups, despite correctly setting the UID and GID of the NFS-permitted user via environment variables and the user directive in docker-compose.yml.
Steps to reproduce
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Mount an NFS share on the Docker host at /mnt/data
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Ensure that the NFS share is owned by the userbck user, who has read and write permissions.
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Configure the docker-db-backup container with:
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Environment variables USER_DBBACKUP and GROUP_DBBACKUP matching the UID and GID of userbck
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A volume mapping:
volumes:
- /mnt/data:/backup -
Start the container and trigger a backup.
-
What is the expected correct behavior?
The container should be able to write backup files to the /backup directory (which is the NFS share mounted on the host) without permission errors.
Environment
Image version / tag: tiredofit/db-backup:latest
Host OS: Ubuntu 20.04