feat: add DGX Spark MCP Server playbook

This playbook installs the DGX Spark MCP Server, a tool for hardware-aware Spark optimization on DGX systems.
Includes:
- Installation script (npm based)
- Systemd service configuration
- Default configuration
- Documentation

nvidia/dgx-spark-mcp-server/README.md

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+# DGX Spark MCP Server Playbook
+
+This playbook installs and configures the **DGX Spark MCP Server**, a tool that provides hardware-aware Apache Spark optimization for NVIDIA DGX systems via the Model Context Protocol (MCP).
+
+## Overview
+
+The DGX Spark MCP Server enables MCP clients (like Claude Desktop or Claude Code) to:
+*   **Detect Hardware**: Automatically read DGX GPU topology, memory, and CPU specs.
+*   **Optimize Spark**: Generate tuned Spark configurations (`spark-submit` args) based on detected hardware and workload type (ETL, ML Training, Inference).
+*   **Monitor**: Check real-time GPU availability before submitting jobs.
+
+## Prerequisites
+
+*   **NVIDIA DGX System** (or compatible GPU server)
+*   **NVIDIA Drivers** installed (`nvidia-smi` available)
+*   **Node.js 18+**
+*   **Root access** (for systemd service installation)
+
+## Directory Structure
+
+```
+.
+├── config/
+│   └── default.json       # Default configuration
+├── deploy/
+│   └── dgx-spark-mcp.service # Systemd service file
+└── scripts/
+    └── install.sh         # Automated installer
+```
+
+## Installation
+
+1.  **Run the installer**:
+    ```bash
+    sudo ./scripts/install.sh
+    ```
+    This script will:
+    *   Install `dgx-spark-mcp` globally via `npm`.
+    *   Create a dedicated system user (`dgx`).
+    *   Setup logging directory `/var/log/dgx-spark-mcp`.
+    *   Install and start the systemd service.
+
+2.  **Verify Installation**:
+    ```bash
+    systemctl status dgx-spark-mcp
+    ```
+
+## Configuration
+
+The configuration file is located at `/etc/dgx-spark-mcp/config.json`.
+
+### Key Settings
+
+*   **`mcp.transport`**: `stdio` (default) or `sse`.
+*   **`hardware.enableGpuMonitoring`**: Set to `true` to enable real-time `nvidia-smi` queries.
+*   **`logging.level`**: `info` or `debug`.
+
+## Usage with Claude Desktop
+
+Add the following to your `claude_desktop_config.json`:
+
+```json
+{
+  "mcpServers": {
+    "dgx-spark": {
+      "command": "dgx-spark-mcp"
+    }
+  }
+}
+```
+
+## Troubleshooting
+
+**Service fails to start?**
+Check logs:
+```bash
+journalctl -u dgx-spark-mcp -f
+```
+
+**Permission denied?**
+Ensure the `dgx` user has permissions to access `nvidia-smi`. You may need to add the user to the `video` group:
+```bash
+usermod -a -G video dgx
+```

nvidia/dgx-spark-mcp-server/config/default.json

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+{
+  "server": {
+    "port": 3000,
+    "host": "localhost",
+    "nodeEnv": "production"
+  },
+  "logging": {
+    "level": "info",
+    "format": "json",
+    "dir": "/var/log/dgx-spark-mcp",
+    "maxFiles": 10,
+    "maxSize": "10m"
+  },
+  "mcp": {
+    "serverName": "dgx-spark-mcp",
+    "serverVersion": "0.1.0",
+    "transport": "stdio"
+  },
+  "hardware": {
+    "nvidiaSmiPath": "/usr/bin/nvidia-smi",
+    "cacheTTL": 30000,
+    "enableGpuMonitoring": true
+  },
+  "spark": {},
+  "performance": {
+    "enableMetrics": true,
+    "metricsInterval": 60000,
+    "healthCheckInterval": 30000
+  },
+  "security": {
+    "enableAuth": false
+  }
+}

nvidia/dgx-spark-mcp-server/deploy/dgx-spark-mcp.service

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+[Unit]
+Description=DGX Spark MCP Server
+Documentation=https://github.com/raibid-labs/dgx-spark-mcp
+After=network.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=dgx
+Group=dgx
+# Environment variables
+Environment="NODE_ENV=production"
+Environment="DGX_MCP_CONFIG_PATH=/etc/dgx-spark-mcp/config.json"
+
+# Start the service
+# Assumes installed globally via npm
+ExecStart=/usr/local/bin/dgx-spark-mcp
+
+# Restart policy
+Restart=on-failure
+RestartSec=10
+StartLimitInterval=600
+StartLimitBurst=5
+
+# Resource limits
+LimitNOFILE=65536
+LimitNPROC=4096
+
+# Security hardening
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+# Allow write access to logs
+ReadWritePaths=/var/log/dgx-spark-mcp
+
+# Logging
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=dgx-spark-mcp
+
+# Process management
+KillMode=mixed
+KillSignal=SIGTERM
+TimeoutStopSec=30
+
+[Install]
+WantedBy=multi-user.target

nvidia/dgx-spark-mcp-server/scripts/install.sh

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+#!/bin/bash
+set -euo pipefail
+
+# DGX Spark MCP Server - Playbook Installation Script
+# Installs the server from NPM and configures systemd
+
+# Configuration
+PACKAGE_NAME="dgx-spark-mcp"
+SERVICE_NAME="dgx-spark-mcp"
+CONFIG_DIR="/etc/dgx-spark-mcp"
+LOG_DIR="/var/log/dgx-spark-mcp"
+USER="dgx"
+GROUP="dgx"
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+NC='\033[0m'
+
+log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
+log_error() { echo -e "${RED}[ERROR]${NC} $1"; }
+
+# Check root
+if [[ $EUID -ne 0 ]]; then
+   log_error "This script must be run as root" 
+   exit 1
+fi
+
+# 1. Install Node.js (if missing) - Brief check
+if ! command -v node &> /dev/null; then
+    log_info "Node.js not found. Please install Node.js 18+."
+    exit 1
+fi
+
+# 2. Install Package
+log_info "Installing $PACKAGE_NAME from registry..."
+npm install -g $PACKAGE_NAME
+
+# 3. Create User
+if ! id -u "$USER" &>/dev/null; then
+    log_info "Creating user $USER..."
+    useradd --system --no-create-home --shell /bin/false "$USER"
+fi
+
+# 4. Setup Directories
+log_info "Setting up directories..."
+mkdir -p "$CONFIG_DIR"
+mkdir -p "$LOG_DIR"
+
+# Copy config if provided in playbook
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+if [[ -f "$SCRIPT_DIR/../config/default.json" ]]; then
+    cp "$SCRIPT_DIR/../config/default.json" "$CONFIG_DIR/config.json"
+else
+    log_info "No default config found, using internal defaults."
+fi
+
+# Permissions
+chown -R "$USER:$GROUP" "$LOG_DIR"
+chown -R "$USER:$GROUP" "$CONFIG_DIR"
+chmod 755 "$LOG_DIR"
+chmod 755 "$CONFIG_DIR"
+
+# 5. Setup Service
+log_info "Configuring systemd service..."
+if [[ -f "$SCRIPT_DIR/../deploy/$SERVICE_NAME.service" ]]; then
+    cp "$SCRIPT_DIR/../deploy/$SERVICE_NAME.service" "/etc/systemd/system/$SERVICE_NAME.service"
+    systemctl daemon-reload
+    systemctl enable "$SERVICE_NAME"
+    systemctl restart "$SERVICE_NAME"
+    log_info "Service started."
+else
+    log_error "Service file not found."
+    exit 1
+fi
+
+log_info "Installation complete."
+log_info "Status: systemctl status $SERVICE_NAME"