Quick blog entry to remember about something that wasn't as trivial as I thought. I needed to use syncthing to keep a single file in sync (KeePassXC database) without synchronizing the whole directory.
You have to use mask exclusion feature to make it possible. Put it simple, you need the share to forbid every file, except the one you want to sync.
This configuration happens in the `.stignore` file in the synchronized directory, but can also be managed from the Web interface.
Syncthing documentation about ignoring files
If I want to only sync KeePassXC files (they have the `.kdbx` extension), I have this in my `.stignore` file:
!*.kdbx
And that's all!
Note that this must be set on all nodes using this share, otherwise you may have surprises.