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----
-created: 2026-10-12 14:07
-modified: 2026-10-12 18:05
-type: note
-tags: [projects/local-llm, infra, ollama, qwen2.5, omniroute]
-aliases: [Local LLM Infrastructure, Qwen2.5 Deployment]
----
-# [[Local LLM Infrastructure & Qwen2.5 Deployment]]
-
-## 📌 Executive Summary
-This project runs an **on-demand local AI model server** on workstation **`sam-4screen-desktop` (`192.168.20.27`)**.
-It uses the machine's 64 GB of RAM and its CPU to run 14-billion parameter Qwen2.5 models, so AI work is possible without cloud cost or cloud dependency.
-Other machines and services reach it over the home network.
-
----
-
-## 🖥️ System Architecture
-
-```mermaid
-flowchart LR
-    subgraph Clients["Clients"]
-        NV["Neovim / Avante / CodeCompanion (.27, .13, .51)"]
-        DASH["Family Console Dashboard (start / stop)"]
-    end
-    subgraph Host27["sam-4screen-desktop (192.168.20.27)"]
-        SYS["NixOS system service: ollama.service"]
-        ENG["Ollama Engine :11434 - CPU + AVX2"]
-        MEM["64 GB DDR4 System RAM"]
-    end
-    subgraph Router13["nixos-desktop (192.168.20.13)"]
-        OR["OmniRoute Gateway :20128"]
-        CLOUD["Cloud fallback: DeepSeek, Claude"]
-    end
-    DASH -->|start / stop| SYS
-    SYS --> ENG
-    ENG --> MEM
-    NV -->|direct :11434| ENG
-    NV -.->|ollama-local/qwen2.5-coder:14b| OR
-    OR -->|primary route| ENG
-    OR -.->|when .27 is off| CLOUD
-```
-
----
-
-## 🖧 Machine Roles
-
-* **`.27` (`sam-4screen-desktop`) — AI host.**
-  Intel Core i7-7700K (4 cores, AVX2) and 64 GB DDR4 RAM, with about 32 GB free for models.
-  The NVIDIA Quadro P620 drives the displays only; it is not used for inference.
-* **`.13` (`nixos-desktop`) — network gateway.**
-  Runs OmniRoute, Caddy, and DNS. By design it runs **no** model inference, because it has little spare memory.
-
----
-
-## ⚙️ How the Service Works
-
-The model server is declared in NixOS, which makes it reproducible and easy to audit.
-It is **off at boot** so it only uses resources when wanted.
-
-* **Start / stop:** from the family console dashboard.
-* **Manual control:** `sudo systemctl start ollama` and `sudo systemctl stop ollama`.
-* **Listen address:** `0.0.0.0:11434`, so `.13`, `.51`, and other LAN clients can connect.
-* **Warm models:** `OLLAMA_KEEP_ALIVE = -1` keeps the model in RAM while the service runs, so responses are immediate. Stopping the service releases all of that RAM.
-
----
-
-## 🤖 Installed Models
-
-| Model | Size | Quantization | Primary Purpose |
-| :--- | :--- | :--- | :--- |
-| `qwen2.5-coder:14b` | 9.0 GB | Q4_K_M GGUF | Code generation, review, and refactoring |
-| `qwen2.5:14b` | 9.0 GB | Q4_K_M GGUF | Drafting, reasoning, and general analysis |
-
-Models live in `/var/lib/ollama/models`.
-
----
-
-## 🌐 Routing Through OmniRoute (verified working)
-
-OmniRoute on `.13` exposes the local models alongside cloud models, with automatic fallback.
-
-| Entry | Value |
-| :--- | :--- |
-| Base URL | `http://192.168.20.13:20128/v1` |
-| Model name | `ollama-local/qwen2.5-coder:14b` |
-| Direct to `.27` | `http://192.168.20.27:11434` with model `qwen2.5-coder:14b` |
-
-Verified: chat requests through OmniRoute return HTTP 200 for both models, and the connection reports `test_status: active`.
-
----
-
-## 💼 Skills & Technical Concepts Demonstrated
-
-* **Linux system administration** — systemd service design, boot policy, sandboxing trade-offs (`DynamicUser`, `ProtectHome`), firewall rules, network binding.
-* **Fault diagnosis** — traced a failed system rebuild to two independent causes: stale config symlinks and two services competing for one port.
-* **Local AI operations** — CPU inference, GGUF quantization, RAM budgeting, model warm-up and idle policy.
-* **Hybrid cloud architecture** — local-first inference with automatic cloud fallback through an API gateway.
-
----
-
-## 🔗 Related
-
-* Interactive architecture map: [Archify map](https://maps.lab.audasmedia.com.au/ollama_local_llms/docs/)
-* AI context (Outline): `docs/outline/00-index.md`