# 109 — `syncthing`

Cross-device file sync into `/mnt/library/syncthing`.

## At a glance
- **Hostname:** `syncthing`
- **IP:** (none — currently stopped)
- **Privilege:** **unprivileged** + idmap (for the `media` GID 10000 standard)
- **Resources:** 2 cores / 2 GiB RAM / 8 GiB rootfs
- **Mounts:** `/mnt/library` ↔ `/mnt/library`
- **Status:** **stopped** (was running prior to 2026-04-21).

## Permissions quirk
The syncthing systemd unit runs with `User=root`, and systemd skips `initgroups()` for `User=root`. Drop-in adds `SupplementaryGroups=media` to `syncthing@.service` so it actually picks up GID 10000. See [media permissions](../infrastructure/media-permissions.md).

## Related
- [Media permissions](../infrastructure/media-permissions.md)
- [Hubris host](../hosts/hubris.md)

## Changelog

### 2026-04-28 — wiki entry created
Initial documentation. Container is currently stopped — reason not yet documented; investigate before re-enabling or destroying.

### 2026-04-20 — joined the `media` GID 10000 standard
Idmap block + drop-in `SupplementaryGroups=media` on `syncthing@.service`. Config backup: `/root/109.conf.bak.*`.