feat(blender): Blender 5.2.2 LTS on fv-ml1 GPU 3, on demand (Prime)
Uses linuxserver/blender (Selkies Wayland desktop, NVENC), digest-pinned. The container sees only GPU 3, has restart "no", and runs only while in use, because GPU 3 is the reserve card for a full-size vLLM seat. Web desktop on :3001 with basic auth (vault fv-ml1/blender-web-password). /work is on /tank and is not backed up; /config lives under /opt/docker (restic). Acceptance: Cycles finds the card on OptiX and CUDA (sm_120 kernels ship in the build). The heavy self-test renders in 3.54 s on OptiX vs 22.71 s on CPU, a functional check with n=1. Web auth answers 401 without credentials and with a wrong password, and 200 with the right one.
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@@ -224,6 +224,10 @@ eats into a future big seat's profiling margin. Small seats go on GPU 0, which h
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the most uncommitted headroom (its seats commit util 0.88; GPU 1 is at 0.975 and
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GPU 2 at 0.96).
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**GPU 3 on-demand tenant (Prime, 2026-09-27): `blender`** (`stacks/blender/`). It is up only
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while in use (`restart: "no"`, about 270 MiB when idle with the desktop running, 0 when down).
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The reserve still stands: whenever a full-size seat takes GPU 3, Blender stays down.
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**Retired:**
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- `llama-swap` (former GGUF multiplexer on :9292) — replaced by dedicated
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per-model seats (e.g. `llama-charrp`); no longer running.
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@@ -0,0 +1,6 @@
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# blender — copy to /opt/docker/compose/blender/.env on fv-ml1 (mode 0600).
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IMAGE=lscr.io/linuxserver/blender:5.2.2-ls241@sha256:9216c77ab2bf38a758390f802c5777554df605c53456dbcad828509a27a8f28b
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HTTPS_PORT=3001
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# Basic auth for the web desktop. PASSWORD source of truth: secret get fv-ml1/blender-web-password
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CUSTOM_USER=blender
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PASSWORD=
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@@ -0,0 +1,51 @@
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# blender
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**Blender 5.2.2 LTS on fv-ml1 GPU 3, on demand.** Agents drive it; there is also a browser
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desktop to watch it or take over. Prime, 2026-09-27: "go ahead with gpu 3, both". He does not
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use Blender himself, so the agent side (MCP) is the primary interface.
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| | |
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|---|---|
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| **Desktop** | `https://10.251.50.54:3001` (self-signed cert). Basic auth: user `blender`, password `secret get fv-ml1/blender-web-password`. |
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| **Image** | `lscr.io/linuxserver/blender:5.2.2-ls241@sha256:9216c77a…` (Selkies 2.0 Wayland desktop, NVENC stream). |
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| **GPU** | GPU 3 only (`NVIDIA_VISIBLE_DEVICES=3`). About 270 MiB is held while the desktop runs. |
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| **Files** | `/work` → `/tank/blender` (projects, assets, renders; **not backed up**). `/config` → `/opt/docker/data/blender` (prefs, add-ons; restic). Files are owned by infra-ops (uid 1002), so agents can `scp` in and out. |
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## ⚠ On demand: GPU 3 is borrowed
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GPU 3 is the fleet's reserve card for a full-size vLLM seat (`servers/fv-ml1/README.md`).
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Blender uses it only while in use:
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```bash
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ssh infra-ops@10.251.50.54 'cd /opt/docker/compose/blender && docker compose up -d' # start
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ssh infra-ops@10.251.50.54 'cd /opt/docker/compose/blender && docker compose down' # stop, card back to 0
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```
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`restart: "no"`, so a reboot never brings it back. **When a big seat moves onto GPU 3, Blender
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stays down.**
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## Headless rendering (no desktop needed)
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```bash
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ssh infra-ops@10.251.50.54 'docker exec -u abc blender blender -b /work/<file>.blend -E CYCLES -o /work/out/frame_#### -a -- --cycles-device OPTIX'
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```
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Run as `-u abc`, the image's user, mapped to uid 1002, so outputs land owned by infra-ops.
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## Acceptance (2026-09-27, 1356)
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- Cycles sees the card on both OptiX and CUDA: "NVIDIA RTX PRO 6000 Blackwell Max-Q Workstation
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Edition". The build ships `kernel_sm_120.cubin` plus OptiX PTX.
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- Self-test (`/tank/blender/render_test.py`): a subdivided glass monkey, 1920×1080, 1024 samples,
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32 bounces, no denoise. **OptiX 3.54 s against CPU 22.71 s (96 threads).** That is n=1 per
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device: a functional check that the GPU is really used, not a benchmark. A trivial default-cube
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scene could not separate them (0.59 s against 0.65 s), which is why the self-test scene is heavy.
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- Web auth: no credentials gives 401, a wrong password 401, the right one 200.
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- Selkies: "Render node 1 encodes H264, AV1, H265 on nvenc"; the Wayland renderer runs GL on GPU 3.
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## Agent control (MCP)
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Being researched with dvalin-smithy-dev: which Blender MCP server, and how it reaches Blender
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across hosts. This section fills in once the choice is made. ⚠ Most Blender MCP add-ons expose
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"run arbitrary Python inside Blender" on a TCP port. Treat that port like a shell: bind it to
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the container or the LAN only, never publish it wider.
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@@ -0,0 +1,50 @@
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# blender: Blender 5.2 LTS on fv-ml1 GPU 3, driven by agents (MCP) with a browser desktop for
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# watching. Prime, 2026-09-27: "go ahead with gpu 3, both".
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#
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# ⚠ ON DEMAND ONLY. GPU 3 is the fleet's deliberately empty card, the reserve for a full-size
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# vLLM seat (flash-next needs 93 of 96 GiB, and vLLM sizes KV against TOTAL VRAM). Blender
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# borrows it: `restart: "no"`, so a reboot never brings it back, and it is stopped whenever a big
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# seat needs the card. Start: `docker compose up -d`. Stop: `docker compose down`.
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#
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# Image: linuxserver/blender (Selkies web desktop, official Blender build with sm_120 CUDA +
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# OptiX kernels). Its NVIDIA mode needs host driver >= 580 (fv-ml1: 580.65.06) and
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# /dev/nvidia-modeset. HTTPS only (Selkies' WebCodecs need a secure context), self-signed cert.
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# Basic auth from .env (CUSTOM_USER / PASSWORD; vault fv-ml1/blender-web). The desktop grants
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# a shell inside the container, so never expose it beyond the LAN.
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#
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# Paths: /config (home: prefs, add-ons) → /opt/docker/data/blender (restic via /opt/docker).
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# /work (projects, assets, renders) → /tank/blender (big, NOT backed up; renders are
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# regenerable, and anything precious is copied out).
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#
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# .env (tunables): IMAGE, HTTPS_PORT, CUSTOM_USER, PASSWORD.
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name: blender
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services:
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blender:
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image: ${IMAGE:?set IMAGE}
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container_name: blender
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restart: "no"
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runtime: nvidia
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environment:
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PUID: "1002" # infra-ops, so agents can read and write /work over ssh
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PGID: "1003"
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TZ: America/Los_Angeles
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CUSTOM_USER: ${CUSTOM_USER:?set CUSTOM_USER}
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PASSWORD: ${PASSWORD:?set PASSWORD}
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NVIDIA_VISIBLE_DEVICES: "3" # GPU 3 only: never touch the serving cards
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NVIDIA_DRIVER_CAPABILITIES: all # compute (Cycles), graphics (viewport), video (NVENC stream)
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devices:
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- /dev/nvidia-modeset:/dev/nvidia-modeset
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volumes:
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- /opt/docker/data/blender:/config
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- /tank/blender:/work
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ports:
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- "${HTTPS_PORT:-3001}:3001"
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shm_size: "1gb"
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labels:
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- homepage.group=AI - Studios
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- homepage.name=Blender
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- homepage.icon=si-blender
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- homepage.description=Blender 5.2 on fv-ml1 GPU 3 (on demand)
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- homepage.href=https://10.251.50.54:${HTTPS_PORT:-3001}
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