Filesystem Watcher Errors in Syncthing Docker Container (UGREEN NAS)

[kuhnikuehnast]

Hello Syncthing Community,

I am running Syncthing in a Docker container on a UGREEN NAS and encountering Filesystem Watcher Errors when using PUID and PGID that match my NAS user. However, if I set both values to 0, the error disappears, but Syncthing warns that running as an admin user is not recommended.

Issue:

When PUID=1000 and PGID=10 (matching my NAS user), I get Filesystem Watcher Errors like:

kotlin

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Filesystem Watcher Errors  
error while traversing /var/syncthing/data/<folder>: permission denied  
error while traversing /var/syncthing/data/<another-folder>: permission denied  

However, if I set PUID=0 and PGID=0, the errors disappear, but Syncthing warns:

pgsql

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Syncthing should not run as a privileged or system user. Please consider using a normal user account.  

Troubleshooting Tried:

• Verified that the folders have drwxrwxrwx permissions and belong to the correct user/group.
• Mounted volumes using :rw, :z, and :Z to adjust access control.
• Ensured that no SELinux/AppArmor restrictions apply.
• Confirmed that the Syncthing container user matches the expected NAS user/group.

Question:

What is the best way to resolve this issue without running Syncthing as root? Is there a known way to fix the Filesystem Watcher Errors while keeping proper user/group settings?

Any help or guidance would be greatly appreciated. Thank you!

[calmh (Jakob Borg)]

The errors present as from the watcher but I think they are just regular file permission issues. You say you’ve checked all the basics there, but nonetheless that appears to be the problem.