# 132 — `rclone`

Off-host backup appliance. Mirrors selected `/mnt/library` folders to **Proton Drive**
with a plain `rclone sync` (monthly), and serves rclone's Web GUI on the LAN for browsing
and ad-hoc runs. **Replaces** the disabled restic-on-USB job — see [backups](../infrastructure/backups.md).

Provisioned 2026-07-01. (LXC 131 was already taken by an undocumented `teddycloud` container,
so this landed on **132**.)

## At a glance

- **Hostname:** `rclone`
- **IP:** `192.168.8.214` (static, set in PVE `net0` config — same pattern as grimmory/authentik)
- **Privilege:** privileged (root in-container = host root → reads every `/mnt/library` subtree,
  incl. `homecloud/` and `documents/`, regardless of owner)
- **Resources:** 1 core / 2 GiB RAM / 8 GiB rootfs (Debian 13) — bumped from 1 GiB on 2026-07-03
  after `rclone-rcd.service` was OOM-killed under real load (see "Known issue" below)
- **Mounts:** `/mnt/library` **read-only** (`mp0: /mnt/library,mp=/mnt/library,ro=1`) — a backup
  job must never be able to write into the library
- **Public hostname:** none — the UI is **LAN-only, no auth** (by design)

## Service / port map

| Service | Listen | Notes |
|---------|--------|-------|
| rclone Web GUI (`rcd`) | `192.168.8.214:5572` | `rclone-rcd.service`, **`--rc-no-auth`**, LAN-only. Browse `/mnt/library` + `proton:`, run ad-hoc syncs, live job status |
| monthly mirror | — | `rclone-backup.service` + `.timer` (`OnCalendar=*-*-01 03:00`) |

## Backup design

- **Mode:** plain mirror — `rclone sync` (Proton mirrors local; deletions propagate; **no versioning**).
- **Encryption:** Proton Drive's built-in E2E only (no rclone `crypt` overlay → files stay
  browsable in Proton's web UI).
- **Selected set:** `/etc/rclone-backup/folders.list` — one absolute source path per line
  (`#`/blank ignored). This file *is* the picked set the monthly timer mirrors. Extensible to other
  disks once bind-mounted into this LXC.
- **Path mapping:** source `S` → `proton:library-backup/<S without leading slash>`
  (e.g. `/mnt/library/notes` → `proton:library-backup/mnt/library/notes`).
- **Runner:** `/usr/local/sbin/rclone-backup.sh [folder ...]` (Python, despite the `.sh` name — kept
  the path stable) — no arg = every enabled line. Submits each folder as an **async job through the
  rclone rc API** served by `rclone-rcd.service` (the same daemon backing the Web GUI on `:5572`),
  so scheduled/ad-hoc runs show up live in the GUI's **Jobs panel**, not just in logs. Gentle on
  Proton's rate limits (`Transfers=4, TPSLimit=8, FastList=true` via the rc `_config` payload). The
  rc API here requires **POST for every call** including `job/status` and `core/stats` — GET with
  query params 404s.
- **Logs / "past runs":** per-run logs in `/var/log/rclone-backup/<safe>-<ts>.log`; one-line
  JSON summary per run appended to `/var/log/rclone-backup/runs.jsonl`.
- **Failure notify:** `OnFailure=rclone-backup-notify@%n.service` → logs to journal today;
  **TODO** wire to Hermes `send_message` (Matrix) per [backups](../infrastructure/backups.md).

## rclone + Proton Drive

- **rclone** installed from the official binary (not apt) so the `protondrive` backend is present
  (`rclone v1.74.3`).
- Remote **`proton:`** (type `protondrive`). Config at `/root/.config/rclone/rclone.conf`, mode 600.
  **This file is a secret** (holds the obscured Proton password + TOTP secret + session) — **never
  commit it.** Escrow the Proton account creds in the password manager.
- **Config gotchas** (from rclone docs/forum):
  - Log into Proton via a **browser at least once** first, or key generation fails.
  - For unattended runs, store the **TOTP _secret_** (not a 6-digit code) so rclone self-generates
    codes; obscure with `rclone obscure`.
  - Passwords with **extended-ASCII** characters are known to break auth.
  - Proton's API is rate-limited → keep `--transfers`/`--tpslimit` conservative (baked into the runner).
- **DR escrow (pending):** store the Proton creds as sops secret `secrets/protondrive.yaml`, granted
  to this LXC's age key, so the remote can be rebuilt after a re-provision.

## The UI (rclone Web GUI)

`rclone rcd --rc-web-gui --rc-no-auth --rc-addr 0.0.0.0:5572` (assets auto-downloaded on first
start). Reach it at **http://192.168.8.214:5572** on the LAN.

> **Security note:** `--rc-no-auth` exposes *full* rclone control — including deleting remote data —
> to anyone on the LAN (accepted per the design choice). The container has only a LAN NIC, so it is
> not publicly reachable. Harden later by adding `--rc-user/--rc-pass` or fronting it with Authentik.

## Tracked config (deferred)

**Not yet tracked.** The runner, systemd units, and `folders.list` currently live as plain files
directly on the LXC — fully functional, just not version-controlled or auto-deployed. A
`dtoro/rclone` gitea repo package (runner, units, `install.sh`, webhook receiver) is pre-built and
staged at `/root/rclone-repo` on the LXC for whenever this gets tracked (Shape A, like
[caddy](121-caddy.md)). Gitea `ALLOWED_HOST_LIST` already includes `192.168.8.214` in anticipation.
See [auto-deploy](../infrastructure/auto-deploy.md).

**Selected folders (live in `/etc/rclone-backup/folders.list`):** `/mnt/library/cloud` (287G),
`/mnt/library/documents` (249M), `/mnt/library/repos` (83M). `/mnt/library/notes` was synced once as
a connectivity test (not in the recurring set). Proton quota checked: 2 TiB plan, ~1.65 TiB free
after this set.

## Enrollment gotcha: `pct exec` PATH

`pct exec` (lxc-attach) does **not** source `/etc/environment` or run a login shell, so
`/usr/local/bin` (where bootstrap installs `sops`) isn't on `$PATH` by default — bootstrap's own
`command -v sops` post-install check failed under `pct exec` even though the binary installed fine.
Fixed by symlinking `/usr/local/bin/{sops,homelab}` into `/usr/bin` (always on the minimal PATH),
rather than relying on `/etc/environment`. Same category as the documented [`pct exec` no-initgroups
gotcha](../infrastructure/media-permissions.md#gotchas) — worth adding to
[agent-enrollment.md troubleshooting](../../../.agents/operations/agent-enrollment.md#troubleshooting) if it recurs
on future LXC bootstraps.

## Known issue: `rclone-rcd.service` OOM-killed under 1 GiB RAM (root cause, resolved)

What looked like repeated "protondrive silently stalls" was actually **`rclone-rcd.service` (the rc
API daemon backing the Web GUI and, since the rc-API redesign, all actual sync work) getting
OOM-killed** under the original 1 GiB RAM allocation — `journalctl` confirms
`A process of this unit has been killed by the OOM killer` at the exact moment a transfer had
"frozen." systemd's own `Restart=on-failure` (5s) auto-respawns it, but every in-flight job's state
is lost on the kill, which looked identical to a silent backend hang from the outside (frozen
`core/stats`, no new log lines). **Fix: bumped the LXC's memory to 2 GiB** (`pct set 132 -memory
2048` — applies live via the host cgroup, confirmed via `cat /sys/fs/cgroup/lxc/132/memory.max` on
hubris, no container reboot needed). After the bump, the full folder set (`cloud` 287G, `documents`
249M, `repos` 83M) completed cleanly with no further kills.

**`rclone-backup-watchdog.timer`** (every 5 min) → `rclone-backup-watchdog.sh`: if
`rclone-backup.service` is active but total transferred bytes (global `core/stats` on the rc API)
haven't moved for 15 minutes, it restarts both `rclone-rcd.service` (clears any stuck/orphaned job —
this is the actual daemon holding the work, not the thin wrapper) and then `rclone-backup.service`
(`--no-block`, load-bearing — see below). Kept as a safety net even after the RAM fix, in case
memory pressure returns under a larger folder set later. State kept in
`/var/lib/rclone-backup/watchdog-state.json`, cleared whenever the service isn't running.

**Two watchdog design bugs found and fixed while chasing this (2026-07-03):**
1. **Wrong stats-group key.** Per-job progress polling queried `core/stats` under `job/<jobid>`,
   but rclone tracks stats under whatever `_group` name the job was submitted with. Made a perfectly
   healthy sync look stalled at 0 bytes for 22+ hours in its own log. Fixed by using the same
   `group` variable consistently. **Lesson: distrust the per-run log's "progress bytes=" line during
   an incident; cross-check with unfiltered `core/stats` first.**
2. **Watchdog restarted only the thin wrapper, and blocked doing it.** The actual `rclone sync` work
   runs inside `rclone-rcd.service`, not `rclone-backup.service` — restarting the wrapper alone left
   any stuck job orphaned inside `rcd` while a new wrapper submitted a duplicate job on top. Worse,
   `systemctl restart rclone-backup.service` (no `--no-block`) blocks until the *new* invocation's
   long-running `ExecStart` exits — which could be hours — so the watchdog's own oneshot service
   never logged "Finished," and `OnUnitActiveSec` (which schedules relative to the previous run
   *finishing*) never fired again. The watchdog silently disabled itself after exactly one use.
   Fixed: restart `rclone-rcd.service` first, then `rclone-backup.service` with `--no-block`.

## Related

- [Backups](../infrastructure/backups.md) — this job supersedes the disabled restic-on-USB backup
- [Hubris host](../hosts/hubris.md) — owns `/mnt/library`
- [Media permissions](../infrastructure/media-permissions.md) — read-only consumer of `/mnt/library`
- [Containers index](index.md)

## Changelog

### 2026-07-03 — root cause found (OOM, not Proton); RAM bumped to 2 GiB; full folder set completed

What looked like repeated silent "protondrive stalls" turned out to be **`rclone-rcd.service`
getting OOM-killed** under the original 1 GiB RAM allocation — confirmed via
`journalctl -u rclone-rcd.service` showing `killed by the OOM killer` at the exact freeze point.
Bumped the LXC to 2 GiB RAM (live, no reboot). After the bump: `cloud` (287G) completed cleanly
(exit 0), `documents` (249M) completed with 1 minor error (259.7 MB transferred), `repos` (83M)
completing as of this entry. Also fixed two real watchdog bugs found while chasing this (wrong
stats-group key making a healthy sync look frozen; watchdog restarting only the wrapper with a
blocking `systemctl restart`, causing it to silently disable itself after one use) — see "Known
issue" above for full detail. The watchdog is kept as a safety net going forward even though the RAM
bump addresses the actual root cause.

### 2026-07-02 — runner rewritten to submit jobs via the rc API (GUI job visibility)

The original runner (`rclone sync` invoked as a standalone CLI subprocess) was invisible to the Web
GUI's Jobs panel — the GUI only tracks work submitted through its own `rcd` process. Rewrote
`/usr/local/sbin/rclone-backup.sh` in Python, submitting each folder via `POST /sync/sync` with
`_async: true` against `http://127.0.0.1:5572` (the running `rclone-rcd.service`), then polling
`POST /job/status` + `POST /core/stats` (both **must be POST** — GET-with-querystring 404s on this
rc API) until finished, logging periodic progress snapshots and the same `runs.jsonl` summary line
as before. Verified live: submitted job visible in `POST /job/list`'s `runningIds` while running,
completed cleanly (`success: true`) once done. Deployed via atomic rename (write-then-`mv`) rather
than truncating in place, specifically so it wouldn't risk corrupting the still-running original
`cloud`+`documents`+`repos` sync mid-flight (verified after the fact: that sync's bash process was
unaffected, kept running to completion under the old in-memory script content). The already-running
scheduled sync from before this change is a standalone process and won't retroactively appear in the
GUI; every run after this point will.

### 2026-07-02 — Proton Drive auth fixed; real folder set enabled; first live sync

Initial `rclone config` failed 2FA (`422 ... auth/v4/2fa`) because a live 6-digit TOTP code was
entered instead of the TOTP secret — reconfigured with the secret, auth now works
(`rclone lsd proton:` lists the Drive). Verified end-to-end with a real sync of `/mnt/library/notes`
(219 objects, 5.964 MiB, exit 0) — confirmed files land as plain, browsable objects on Proton (not
an opaque archive), matching the plain-mirror + Proton-E2E design. Checked Proton quota (2 TiB
plan, 1.945 TiB free) before enabling a large folder. `folders.list` set to the real selection:
`cloud` (287G), `documents` (249M), `repos` (83M); a full sync of that set was kicked off via the
actual `rclone-backup.service` unit (not an ad-hoc call) to validate the real monthly path early
rather than waiting for the Aug 1 timer. Tracked-repo step (`dtoro/rclone` on gitea) deferred by
choice — runner/units/`folders.list` remain plain files on the LXC for now; the repo package stays
staged at `/root/rclone-repo` for later.

### 2026-07-01 — provisioned; enrolled

LXC 132 created (Debian 13, privileged, `192.168.8.214`, `/mnt/library` read-only). rclone v1.74.3
installed from the official binary (`protondrive` backend present). Runner + monthly timer +
`folders.list` deployed; rclone Web GUI (`rcd`, LAN-only no-auth) live on `:5572`. Enrolled into
homelab-context (`--no-mesh`, LAN-only issuance): age key issued, inventory finalized, shared
secrets granted, `homelab whoami` + `homelab secret hello` verified. Gitea `ALLOWED_HOST_LIST`
updated to include `192.168.8.214`. Hit and fixed a `pct exec` PATH gotcha (see below). Proton Drive
remote, `dtoro/rclone` tracked repo + webhook, and the `secrets/protondrive.yaml` escrow remain
operator-run follow-ups (credentialed steps — Proton password/2FA, repo creation). Restic-on-USB
backup deprecated in the same change.
