feat(apps): attach the media library and the legacy Nextcloud dataset over NFS
plex, sonarr, radarr and nextcloud each gain one bulk volume. Authored in the catalog and re-rendered, never hand-edited into apps/ (render-golden: 10/10). Layout, the export change the operator must apply, the uid analysis and the validation probes are in docs/BULK-NFS-STORAGE.md; everything there was measured on the host over read-only SSH, not assumed. WHAT THE LAYOUT TURNED OUT TO BE, AND WHY IT DECIDED THE DESIGN /mnt/Storage/plex holds movies/ tv/ photos/ AND downloads/ as SIBLINGS in one dataset — so the arrs' import source and their libraries are one filesystem on the server, and the download client's completed folders are already named radarr/ and tv-sonarr/. The k3s arrs are joining a tree an arr stack has been driving for a long time. That sibling fact is the whole argument for the arrs mounting the export ROOT rather than a subPath per directory. Sonarr and Radarr import by hardlinking or atomically renaming, both same-filesystem operations, and to the kernel "same filesystem" means SAME MOUNT. Two subPath mounts of one export are two mounts: link() across them returns EXDEV regardless of what the server knows, and the arrs do not fail loudly — they degrade to copy-then-delete, rewriting every file over NFS and destroying the seeding copy. The smallest subtree containing both tv/ and downloads/ IS the export root, so the root mount is the MINIMAL mount that preserves hardlinks. Least privilege bounded below by a hard requirement. The cost is stated, not hidden: sonarr can also write /media/movies. plex /mnt/Storage/plex -> /media ro ReadOnlyMany sonarr /mnt/Storage/plex -> /media rw ReadWriteMany radarr /mnt/Storage/plex -> /media rw ReadWriteMany nextcloud /mnt/Storage/nextcloud -> /mnt/legacy-nextcloud ro ReadOnlyMany (subPath: nextcloud) Plex is read-only because it indexes and streams; every write on that tree belongs to the arrs, and saying so removes Plex from the set of things that can damage 8.33 T. All three media consumers use the SAME mountPath deliberately: when qbittorrent is eventually given this export, the arrs and the download client will already agree on absolute paths, which is the other precondition for hardlinked imports. *** /media AND NOT /data — A COLLISION CAUGHT WHILE RENDERING. *** The arrs' Longhorn config PVC renders at the renderer default /data/config. A media mount at /data is mounted OVER it and MASKS the config volume: the pod comes up with its app database shadowed by an 8 T media tree. That discovery also exposed a SEPARATE PRE-EXISTING BUG, reported and deliberately NOT fixed here: LinuxServer arr images run with -data=/config, so /data/config is very likely the wrong home for that PVC and the app has been writing its EPHEMERAL layer — the exact failure catalog/plex.yaml's mountPath comment records already having been bitten by. Plex was fixed; sonarr, radarr, qbittorrent and jackett were not. Fixing it starts those apps from an empty config volume, so it needs its own change with the operator present. This change does not make it worse. UID/GID — THE FAILURE THIS TIER ALWAYS HAS The export is sec=sys + no_root_squash, so the client's numeric uid passes through verbatim and the server's ownership is the entire access story. The tree is 0755 owned 1000:3000, so ONLY uid 1000 can write it. LinuxServer images default to 911. Without intervention sonarr and radarr would have mounted cleanly, gone Ready, and failed EVERY import with EACCES. And fsGroup cannot fix that — the in-tree NFS plugin does NO ownership management, so podSecurityContext.fsGroup is a no-op on an NFS volume. Reaching for it is how this gets misdiagnosed. So PUID=1000/PGID=3000 are added to both arrs (PGID 3000 keeps what they write group-readable to the live non-k3s consumers of the same export), and fsGroup: 3000 is added for the LONGHORN config PVC only, so changing PUID does not depend on the image re-chowning /config. plex already runs as 1000 and reads a 0755 tree; nextcloud reads as www-data. Neither needs work. NEXTCLOUD IS MOUNTED READ-ONLY, WHICH IS A DEVIATION FROM THE BRIEF — ON EVIDENCE The task said nextcloud writes. The dataset says otherwise: of 270 G, 267 G is config_backup/, the rest is config/ (103 M) and config_old/ (3.4 G). There is NO data/ directory. This is the OLD non-k3s instance's configuration plus a backup blob — an archive — and that instance is STILL LIVE on it (exported rw to 192.168.1.6 and .5, which the operator has said must stay active). Two Nextclouds writing one instance's config directory, each with its own database and therefore its own oc_filecache, is unrecoverable corruption. "Do not grant more than needed" lands on ro, and ro is the trivially reversible choice. If the intent is in fact a MIGRATION, that is a larger and more deliberate change than a mount; the one-line flip is documented. Read-only for nextcloud can additionally be enforced SERVER-side (only nextcloud consumes that dataset from k3s), and the sharenfs value in the doc uses ro= for the k3s clients. The media tree cannot: plex and the arrs may land on any node, so the server sees the same addresses for reader and writers. Plex's ro is therefore a client-side guarantee — stated as a limitation, not left implied. Co-Authored-By: Claude Opus 5 <[email protected]>
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# Bulk NFS storage — the media library and the legacy Nextcloud archive
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The operator-facing companion to the `class: bulk` storage entries in `catalog/{plex,sonarr,radarr,nextcloud}.yaml`.
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Everything here was **measured** on the storage host on 2026-09-07, over read-only SSH; nothing is
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assumed. It resolves the long-standing **OQ-2** stub (`platform/longhorn/storageclasses.yaml`) for the
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case that actually exists here — attaching datasets that already hold data — and leaves dynamic bulk
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provisioning unimplemented, because nothing needs it.
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---
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## 1. The storage host, and why prod cannot reach it
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The bulk data lives on the **Proxmox host's ZFS pool**. That host has exactly one interface:
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```
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vmbr0 192.168.1.9/24 default via 192.168.1.1 (pfSense LAN)
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```
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| | nodes | reaches 192.168.1.9? |
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|---|---|---|
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| **dev** | 192.168.1.40 / .41 / .42 | **Yes** — same L2 segment, and it already holds an NFS export from this host (`/mnt/Storage/k8s-volumes`, in `/etc/exports`) |
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| **prod** | 192.168.2.10 / .11 / .12 | **No** — 192.168.2.0/24 is pfSense's **WAN**. Ports 22 and 8006 answer only because pfSense port-forwards them via 192.168.2.102. 2049 and 111 do not. |
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Opening the storage path for prod is a **pending operator decision**. Its two candidate outcomes give
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different values for the `BULK_NFS_SERVER` cluster-var:
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| outcome | `BULK_NFS_SERVER` for prod |
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|---|---|
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| port-forward `192.168.2.102:2049` → `192.168.1.9:2049` | `192.168.2.102` |
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| a WAN→LAN route to 192.168.1.0/24 | `192.168.1.9` |
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Until it lands, `clusters/prod` holds `TBD-PROD-BULK-NFS-SERVER`. **See §7 for why that placeholder
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behaves differently from the repo's other ones.**
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### It only needs ONE port
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The PVs mount `nfsvers=4.1`. **NFSv4 carries mount and lock in-protocol**, so the only thing that
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must be reachable is **tcp/2049** — no rpcbind/111, no mountd, no statd. NFSv3 would have needed
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four ports, three of them on ephemeral numbers, which is a materially worse firewall story. The
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server advertises `+3 +4 +4.1 +4.2` (`/proc/fs/nfsd/versions`), so v4.1 is available and is the
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conservative floor.
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### The export's client list is the SAME under both outcomes — measured, not assumed
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**pfSense DNATs the existing port-forward WITHOUT source NAT.** Connecting from this workstation
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(192.168.2.132) to `192.168.2.102:22`, the storage host logged the peer as `192.168.2.132`:
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```
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SSH_CONNECTION=192.168.2.132 39768 192.168.1.9 22
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ss -tn -> 192.168.1.9:22 192.168.2.132:39768
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```
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The original WAN-side source address survives the translation (return traffic finds its way back via
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the host's default route, 192.168.1.1). So under **either** outcome the NFS server will see prod's
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**real** node addresses — 192.168.2.10/.11/.12 — and the `sharenfs` change in §5 is the same either
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way. **It does not have to wait for the routing decision.**
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---
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## 2. The layout, as found
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### `Storage/plex` → `/mnt/Storage/plex` — 8.33 T used, 6.91 T avail
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```
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/mnt/Storage/plex/ drwxr-xr-x 1000:3000
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├── downloads/ drwxr-xr-x 1000:1000
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│ ├── complete/ drwxr-xr-x 1000:3000
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│ │ ├── radarr/ drwxr-xr-x 1000:3000
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│ │ └── tv-sonarr/ drwxr-xr-x 1000:3000
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│ ├── incomplete/ drwxrwxr-x 1000:3000
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│ ├── downloads -> /shared/downloads (symlink OUTSIDE the export — see §8)
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│ └── <in-flight release dirs> drwxr-xr-x 1000:1000
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├── movies/ 1165 entries drwxr-xr-x 1000:3000
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├── tv/ 107 entries drwxr-xr-x 1000:3000
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└── photos/ drwxr-xr-x 1000:3000
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```
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**The single most important fact about this layout: `downloads/` is a SIBLING of `tv/` and `movies/`
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inside the same dataset.** Sonarr's import source and its library are on one filesystem on the
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server, and so are Radarr's. That is what makes hardlinked / atomically-renamed imports possible at
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all — and §4 is about not throwing it away on the client side.
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Note the download client's completed folders are already named `radarr` and `tv-sonarr`, i.e. this
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tree has been driven by an arr stack for a long time. The k3s arrs are joining an existing layout,
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not defining one.
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### `Storage/nextcloud` → `/mnt/Storage/nextcloud` — 270 G used
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```
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/mnt/Storage/nextcloud/ drwxr-xr-x root:root
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└── nextcloud/ drwxr-xr-x 1000:3000
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├── config/ 103 M drwxr-xr-x 1000:3000
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├── config_old/ 3.4 G drwxr-xr-x 1000:3000
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└── config_backup/ 267 G drwxr-xr-x 1000:3000
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```
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**There is no `data/` directory.** 99% of the dataset is `config_backup`. This is the old, non-k3s
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Nextcloud's configuration plus a backup blob — an **archive**, not a live user-data tree. That is
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why it is mounted read-only; see §6.
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---
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## 3. What each app mounts, and why
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| app | export | mountPath | subPath | mode | access mode |
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|---|---|---|---|---|---|
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| plex | `/mnt/Storage/plex` | `/media` | — | **ro** | ReadOnlyMany |
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| sonarr | `/mnt/Storage/plex` | `/media` | — | rw | ReadWriteMany |
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| radarr | `/mnt/Storage/plex` | `/media` | — | rw | ReadWriteMany |
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| nextcloud | `/mnt/Storage/nextcloud` | `/mnt/legacy-nextcloud` | `nextcloud` | **ro** | ReadOnlyMany |
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In-app paths that follow: Plex libraries at `/media/movies`, `/media/tv`, `/media/photos`; Sonarr
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Root Folder `/media/tv`; Radarr Root Folder `/media/movies`; both importing from
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`/media/downloads/complete/{tv-sonarr,radarr}`.
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**All three media consumers use the identical mountPath on purpose.** When qbittorrent is eventually
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given the same export (it is not in this change), the arrs and the download client will already agree
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on absolute paths, which is the second precondition for hardlinked imports — otherwise every import
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needs a Remote Path Mapping and quietly falls back to copying when one is missing.
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**`/media` and not `/data`, and that is not cosmetic.** The arrs' Longhorn config PVC renders at the
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renderer default `/data/config`. A media mount at `/data` would be mounted **over** it and mask the
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config volume entirely. See §8 for the separate latent bug that discovery exposed.
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---
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## 4. Why the arrs mount the export ROOT, not two subPaths
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This is the design decision most likely to be "simplified" later by someone who has not read this.
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Sonarr and Radarr import a finished download into the library by **hardlinking** it (preserving the
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seeding copy) or by an **atomic rename**. Both are same-filesystem operations, and **to the kernel,
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"same filesystem" means "same mount."**
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The tempting narrower shape is two subPath volumes — `subPath: tv` and `subPath: downloads`. Those
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are **two separate mounts** of the same export. `link()` across them returns **EXDEV** no matter that
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the server knows perfectly well they are one dataset. Sonarr does not fail loudly at that: it
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degrades to copy-then-delete. Every import then rewrites the entire file over NFS and destroys the
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seeding copy. The symptom is "imports are slow and my ratio is gone", weeks later.
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The smallest subtree containing both `tv/` and `downloads/` **is the export root**. So the root mount
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is the *minimal* mount that preserves hardlinks: least privilege bounded below by a hard requirement,
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not a shortcut.
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The cost is stated rather than hidden: Sonarr can also write `/media/movies` and Radarr `/media/tv`.
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Narrowing that would cost hardlinks, which is the worse trade.
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---
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## 5. The export change the operator must apply — STRICTLY ADDITIVE
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**Do not apply this from the repo.** It is an operator step on the storage host, recorded here so the
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exact value is reviewable. The existing consumers **must keep working**: 192.168.1.6, 10.123.1.10 and
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192.168.1.18 on the media tree, and 192.168.1.6 and 192.168.1.5 on the Nextcloud dataset, are the
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live non-k3s prod stack.
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Current values (`zfs get sharenfs Storage`):
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```
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Storage/plex [email protected]:@10.123.1.10:@192.168.1.18,no_subtree_check,no_root_squash
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Storage/nextcloud [email protected]:@192.168.1.5,no_subtree_check,no_root_squash
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```
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### `Storage/plex` — append the six k3s node addresses to the existing `rw=` list
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```sh
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zfs set sharenfs='[email protected]:@10.123.1.10:@192.168.1.18:@192.168.1.40:@192.168.1.41:@192.168.1.42:@192.168.2.10:@192.168.2.11:@192.168.2.12,no_subtree_check,no_root_squash' Storage/plex
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```
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Every pre-existing host is preserved verbatim and no option changes; only clients are added.
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### `Storage/nextcloud` — add the k3s nodes to a **`ro=`** list, not to `rw=`
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```sh
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zfs set sharenfs='[email protected]:@192.168.1.5,[email protected]:@192.168.1.41:@192.168.1.42:@192.168.2.10:@192.168.2.11:@192.168.2.12,no_subtree_check,no_root_squash' Storage/nextcloud
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```
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This is the one place read-only can be enforced **server-side**, and it is worth taking: only
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Nextcloud consumes this dataset from k3s, so the export itself can refuse writes. Even a
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misconfigured client cannot then damage the archive.
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**The media tree cannot get the same treatment.** Plex is read-only and the arrs are read-write, but
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all three may be scheduled on any node, so the server sees the same source addresses for all of
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them and cannot distinguish the reader from the writers. **Plex's read-only posture is therefore a
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client-side guarantee** (`spec.nfs.readOnly: true` on `plex-media`, plus the volumeMount flag) — an
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honest limitation, not an oversight. If it ever needs to be server-enforced, the lever is a
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dedicated node pool for Plex, which is a much larger change.
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Per-node addresses rather than `@192.168.2.0/24` follows the precedent already on this host
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(`/etc/exports` lists the dev nodes individually, as `/32`). A `/24` would work and would survive
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adding a node; it also grants the whole subnet. Per-node is the tighter default.
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### Verifying, without changing anything
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```sh
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exportfs -v # the new client lines appear, existing ones unchanged
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zfs get sharenfs Storage/plex Storage/nextcloud
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```
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---
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## 6. uid / gid — the failure this design exists to avoid
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The export uses `sec=sys` and `no_root_squash`, so **the client's numeric uid is passed through
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verbatim** and the server's on-disk ownership is the entire access story. The media tree is
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`0755 1000:3000` throughout (some directories `1000:1000`), so **only uid 1000 can write it**.
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**`fsGroup` cannot fix this, and reaching for it is how this gets misdiagnosed.** The in-tree NFS
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volume plugin performs **no ownership management**, so `podSecurityContext.fsGroup` is a **no-op on
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an NFS volume**. There is no recursive chown, no `g+rwX`, nothing. The container's own uid has to be
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right.
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| app | container uid | writes? | outcome |
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|---|---|---|---|
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| plex | 1000 (`PLEX_UID`/`PLEX_GID`, already set) | no | reads fine — the tree is 0755, so world-readable anyway |
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| sonarr | **1000 via `PUID`** (added) | yes | matches the owner ⇒ writes fine |
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| radarr | **1000 via `PUID`** (added) | yes | matches the owner ⇒ writes fine |
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| nextcloud | 33 (`www-data`) | no | reads and traverses 0755 fine |
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**Without the added `PUID`/`PGID`, sonarr and radarr would have failed exactly the way this tier
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always fails: the mount succeeds, the pod is Ready, and every import fails EACCES.** LinuxServer
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images default to uid/gid **911**, which owns nothing on that tree.
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`PGID: 3000` is chosen over 1000 so files these write are group-owned by the dominant group already
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on the tree, keeping them readable to the live non-k3s consumers.
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`podSecurityContext.fsGroup: 3000` is also added to sonarr and radarr — **for the Longhorn config
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PVC, not for the NFS mount.** fsGroup does work on a Longhorn filesystem, and it makes `/data/config`
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writable by the now-uid-1000 process without depending on the image re-chowning it after `PUID`
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changed.
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Nextcloud needs no uid work at all, which is one more reason its mount is read-only.
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---
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## 7. The prod placeholder does NOT fail at apply time — read this before merging
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Every other `TBD-PROD-*` in `clusters/prod/kustomization.yaml` is rejected loudly by CRD validation
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(Cilium, LB-IPAM, CNPG, Velero) because it is not a valid IP or URL. **This one is not.**
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A PersistentVolume's `spec.nfs.server` is an **unvalidated string**. The API server accepts
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`TBD-PROD-BULK-NFS-SERVER`, the PV is created, and the PVC **binds** to it — binding is pure
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control-plane and never touches the server. The failure appears only when a pod mounts:
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```
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MountVolume.SetUp failed ... Failed to resolve server TBD-PROD-BULK-NFS-SERVER
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```
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so **plex, sonarr, radarr and nextcloud would sit in ContainerCreating on prod.**
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**Consequently: set `BULK_NFS_SERVER` in `clusters/prod/kustomization.yaml` BEFORE prod reconciles a
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revision that carries these bulk volumes.** Dev renders a working value and is where these manifests
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are meant to be proven first.
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### The static guard this convention leans on is missing from `main`
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`bootstrap/standup.sh` — which carries the `*_is_placeholder` guard family — **does not exist on
|
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`main`** (verified: `git ls-tree main bootstrap/` lists only `README.md`, `flux/`, `gitea/`, `sops/`;
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the file lives on unmerged prod branches). So
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`conformance/tests/l0-static/placeholder-guard-coupling/check.sh` exits **3 SKIPPED**, and **nothing
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in the gate currently refuses a placeholder-shaped overlay value.**
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When `standup.sh` lands, that check's assertions (2) and (3) cover this knob automatically — its
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independent detector's SEED vocabulary already matches `TBD` — **provided** the guard gains an arm
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for `BULK_NFS_SERVER` and a consumer that calls it. Without the arm, assertion (2) is what fails, by
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design.
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---
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## 8. Loose ends and things deliberately not done
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1. **`/data/config` is very likely the wrong home for the arrs' config PVC — a pre-existing latent
|
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bug, not fixed here.** LinuxServer's arr images run with `-data=/config`, so the app writes
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`/config`, which is the container's **ephemeral layer**, while the Longhorn PVC mounted at
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`/data/config` sits unused. This is the exact failure `catalog/plex.yaml`'s `mountPath` comment
|
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records having already been bitten by ("the PVC sat unused and Plex wrote to the container's
|
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EPHEMERAL layer"). Plex was fixed; sonarr, radarr, qbittorrent and jackett were not. Fixing it
|
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means those apps start from an empty config volume, so it belongs in its own change with the
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operator present. **This change does not make it worse** — that is why the media mount is `/media`.
|
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2. **qbittorrent has no bulk mount.** Today the arrs' import source is written by the **legacy
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non-k3s** download client, which is coherent while the legacy stack stays live. Giving the k3s
|
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qbittorrent the same export at the same `/media` path is the natural follow-up, and the paths were
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chosen so it needs no Remote Path Mapping.
|
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3. **`/mnt/Storage/plex/downloads/downloads` is a symlink to `/shared/downloads`**, which is outside
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the export. Over NFS it is a dangling symlink on every client. Harmless, but expect Sonarr to log
|
||||
it while scanning `downloads/`.
|
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4. **`nfsvers=4.2` was not chosen**, though the server advertises it. Nothing in these workloads uses
|
||||
what 4.2 adds (server-side copy, sparse-file `SEEK`/`ALLOCATE`), and 4.1 is the version the
|
||||
existing `bulk` StorageClass stub already named.
|
||||
5. **`nconnect` was not set.** It would likely help throughput on the media tree, but it is a tuning
|
||||
change that should be measured, not guessed, and it changes client behaviour under server
|
||||
failure.
|
||||
6. **Nothing was verified against a live cluster.** No `kubectl` context is usable from this
|
||||
workstation (browser-OIDC only), and this change is manifest-authoring under an explicit
|
||||
do-not-apply constraint. Every claim about the *host* is measured; every claim about *binding and
|
||||
mounting* is reasoned from the manifests.
|
||||
7. **The bulk-tier requirement ID is deliberately not typed on any non-`.md` line of this change.**
|
||||
`ci/touched-requirements.sh` attributes requirements from R-IDs appearing in added lines, and the
|
||||
in-cluster conformance test for the bulk tier is still a gap, so typing it would select a
|
||||
requirement the gate cannot satisfy — the hazard `catalog/qbittorrent.yaml` already warns about.
|
||||
Scaffolding that test needs a cluster and is the correct follow-up.
|
||||
|
||||
---
|
||||
|
||||
## 9. Validating on dev, once the export is extended
|
||||
|
||||
Dev can prove all of this before prod's network path exists. Read-only checks first:
|
||||
|
||||
```sh
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev get pv
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev get pvc -A | grep -E 'media|legacy-archive'
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev -n sonarr get pod -o wide
|
||||
```
|
||||
|
||||
Expect **four** PVs — `plex-media`, `sonarr-media`, `radarr-media`, `nextcloud-legacy-archive` (three
|
||||
of them naming the *same* export, one per namespace, which is the cross-namespace model) — each
|
||||
`Bound` to the same-named PVC, with `RECLAIM POLICY Retain` and an empty `STORAGECLASS`.
|
||||
|
||||
Then the two things that actually matter, from inside a pod:
|
||||
|
||||
```sh
|
||||
# (a) the writer can write — this is the uid check, and it is the one that fails in practice
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev -n sonarr exec deploy/sonarr -- \
|
||||
sh -c 'id; touch /media/tv/.k3s-write-probe && rm /media/tv/.k3s-write-probe && echo WRITE-OK'
|
||||
|
||||
# (b) hardlinks work BETWEEN the library and the download path — the root-mount check
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev -n sonarr exec deploy/sonarr -- \
|
||||
sh -c 'set -e; d=/media/downloads/complete/tv-sonarr/.probe; t=/media/tv/.probe-link;
|
||||
echo x > "$d"; ln "$d" "$t"; ls -i "$d" "$t"; rm -f "$d" "$t"; echo HARDLINK-OK'
|
||||
|
||||
# (c) the reader really is read-only
|
||||
infra/devcontainer/dev.sh run kubectl --context k3s-dev -n plex exec deploy/plex -- \
|
||||
sh -c 'touch /media/.probe 2>&1 | head -1' # expect "Read-only file system"
|
||||
```
|
||||
|
||||
`(b)` printing two identical inode numbers is the proof that §4's argument holds in practice. If it
|
||||
prints `EXDEV`, something has split the single mount back into two.
|
||||
Reference in new issue
Block a user