Switch dashboard to ZMQ gossip data source

2025-10-11 13:36:46 +02:00 · 2025-10-11 13:36:46 +02:00 · 656cb5943b
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+/target
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+# Agent Guide
+
+Agents working in this repo must follow the instructions in `CLAUDE.md`.
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+# CM Dashboard - Infrastructure Monitoring TUI
+
+## Overview
+A high-performance Rust-based TUI dashboard for monitoring CMTEC infrastructure. Built to replace Glance with a custom solution tailored for our specific monitoring needs and API integrations.
+
+## Project Goals
+
+### Core Objectives
+- **Real-time monitoring** of all infrastructure components
+- **Multi-host support** for cmbox, labbox, simonbox, steambox, srv01
+- **Performance-focused** with minimal resource usage
+- **Keyboard-driven interface** for power users
+- **Integration** with existing monitoring APIs (ports 6127, 6128, 6129)
+
+### Key Features
+- **NVMe health monitoring** with wear prediction
+- **RAM optimization tracking** (tmpfs, zram, kernel metrics)
+- **Service resource monitoring** with sandboxed limits
+- **Backup status** with detailed metrics and history
+- **Email notification integration**
+- **Historical data tracking** and trend analysis
+
+## Technical Architecture
+
+### Technology Stack
+- **Language**: Rust 🦀
+- **TUI Framework**: ratatui (modern tui-rs fork)
+- **Async Runtime**: tokio
+- **HTTP Client**: reqwest
+- **Serialization**: serde
+- **CLI**: clap
+- **Error Handling**: anyhow
+- **Time**: chrono
+
+### Dependencies
+```toml
+[dependencies]
+ratatui = "0.24"           # Modern TUI framework
+crossterm = "0.27"         # Cross-platform terminal handling
+tokio = { version = "1.0", features = ["full"] }  # Async runtime
+reqwest = { version = "0.11", features = ["json"] }  # HTTP client
+serde = { version = "1.0", features = ["derive"] }   # JSON parsing
+clap = { version = "4.0", features = ["derive"] }    # CLI args
+anyhow = "1.0"             # Error handling
+chrono = "0.4"             # Time handling
+```
+
+## Project Structure
+
+```
+cm-dashboard/
+├── Cargo.toml
+├── README.md
+├── CLAUDE.md              # This file
+├── src/
+│   ├── main.rs            # Entry point & CLI
+│   ├── app.rs             # Main application state
+│   ├── ui/
+│   │   ├── mod.rs
+│   │   ├── dashboard.rs   # Main dashboard layout
+│   │   ├── nvme.rs        # NVMe health widget
+│   │   ├── services.rs    # Services status widget
+│   │   ├── memory.rs      # RAM optimization widget
+│   │   ├── backup.rs      # Backup status widget
+│   │   └── alerts.rs      # Alerts/notifications widget
+│   ├── api/
+│   │   ├── mod.rs
+│   │   ├── client.rs      # HTTP client wrapper
+│   │   ├── smart.rs       # Smart metrics API (port 6127)
+│   │   ├── service.rs     # Service metrics API (port 6128)
+│   │   └── backup.rs      # Backup metrics API (port 6129)
+│   ├── data/
+│   │   ├── mod.rs
+│   │   ├── metrics.rs     # Data structures
+│   │   ├── history.rs     # Historical data storage
+│   │   └── config.rs      # Host configuration
+│   └── config.rs          # Application configuration
+├── config/
+│   ├── hosts.toml         # Host definitions
+│   └── dashboard.toml     # Dashboard layout config
+└── docs/
+    ├── API.md             # API integration documentation
+    └── WIDGETS.md         # Widget development guide
+```
+
+## API Integration
+
+### Existing CMTEC APIs
+1. **Smart Metrics API** (port 6127)
+   - NVMe health status (wear, temperature, power-on hours)
+   - Disk space information
+   - SMART health indicators
+
+2. **Service Metrics API** (port 6128)
+   - Service status and resource usage
+   - Memory consumption vs limits
+   - Disk usage per service
+
+3. **Backup Metrics API** (port 6129)
+   - Backup status and history
+   - Repository statistics
+   - Service integration status
+
+### Data Structures
+```rust
+#[derive(Deserialize, Debug)]
+pub struct SmartMetrics {
+    pub status: String,
+    pub drives: Vec<DriveInfo>,
+    pub summary: DriveSummary,
+    pub issues: Vec<String>,
+    pub timestamp: u64,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ServiceMetrics {
+    pub summary: ServiceSummary,
+    pub services: Vec<ServiceInfo>,
+    pub timestamp: u64,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct BackupMetrics {
+    pub overall_status: String,
+    pub backup: BackupInfo,
+    pub service: BackupServiceInfo,
+    pub timestamp: u64,
+}
+```
+
+## Dashboard Layout Design
+
+### Main Dashboard View
+```
+┌─────────────────────────────────────────────────────────────────────┐
+│ 📊 CMTEC Infrastructure Dashboard                          srv01     │
+├─────────────────────────────────────────────────────────────────────┤
+│ 💾 NVMe Health              │ 🐏 RAM Optimization                    │
+│ ┌─────────────────────────┐  │ ┌─────────────────────────────────────┐ │
+│ │ Wear: 4% (█░░░░░░░░░░)   │  │ │ Physical: 2.4G/7.6G (32%)          │ │
+│ │ Temp: 56°C              │  │ │ zram: 64B/1.9G (64:1 compression)  │ │
+│ │ Hours: 11419h (475d)    │  │ │ tmpfs: /var/log 88K/512M           │ │
+│ │ Status: ✅ PASSED       │  │ │ Kernel: vm.dirty_ratio=5           │ │
+│ └─────────────────────────┘  │ └─────────────────────────────────────┘ │
+├─────────────────────────────────────────────────────────────────────┤
+│ 🔧 Services Status                                                   │
+│ ┌─────────────────────────────────────────────────────────────────┐ │
+│ │ ✅ Gitea (256M/4G, 15G/100G)      ✅ smart-metrics-api         │ │
+│ │ ✅ Immich (1.2G/4G, 45G/500G)     ✅ service-metrics-api       │ │
+│ │ ✅ Vaultwarden (45M/1G, 512M/1G)  ✅ backup-metrics-api        │ │
+│ │ ✅ UniFi (234M/2G, 1.2G/5G)       ✅ WordPress M2              │ │
+│ └─────────────────────────────────────────────────────────────────┘ │
+├─────────────────────────────────────────────────────────────────────┤
+│ 📧 Recent Alerts                     │ 💾 Backup Status             │
+│ 10:15 NVMe wear OK → 4%             │ Last: ✅ Success (04:00)      │
+│ 04:00 Backup completed successfully │ Duration: 45m 32s            │
+│ Yesterday: Email notification test   │ Size: 15.2GB → 4.1GB        │
+│                                     │ Next: Tomorrow 04:00         │
+└─────────────────────────────────────────────────────────────────────┘
+Keys: [h]osts [r]efresh [s]ettings [a]lerts [←→] navigate [q]uit
+```
+
+### Multi-Host View
+```
+┌─────────────────────────────────────────────────────────────────────┐
+│ 🖥️  CMTEC Host Overview                                              │
+├─────────────────────────────────────────────────────────────────────┤
+│ Host      │ NVMe Wear │ RAM Usage │ Services │ Last Alert            │
+├─────────────────────────────────────────────────────────────────────┤
+│ srv01     │ 4%   ✅   │ 32%  ✅   │ 8/8  ✅  │ 04:00 Backup OK       │
+│ cmbox     │ 12%  ✅   │ 45%  ✅   │ 3/3  ✅  │ Yesterday Email test  │
+│ labbox    │ 8%   ✅   │ 28%  ✅   │ 2/2  ✅  │ 2h ago NVMe temp OK   │
+│ simonbox  │ 15%  ✅   │ 67%  ⚠️   │ 4/4  ✅  │ Gaming session active │
+│ steambox  │ 23%  ✅   │ 78%  ⚠️   │ 2/2  ✅  │ High RAM usage        │
+└─────────────────────────────────────────────────────────────────────┘
+Keys: [Enter] details [r]efresh [s]ort [f]ilter [q]uit
+```
+
+## Development Phases
+
+### Phase 1: Foundation (Week 1-2)
+- [x] Project setup with Cargo.toml
+- [ ] Basic TUI framework with ratatui
+- [ ] HTTP client for API connections
+- [ ] Data structures for metrics
+- [ ] Simple single-host dashboard
+
+**Deliverables:**
+- Working TUI that connects to srv01
+- Real-time display of basic metrics
+- Keyboard navigation
+
+### Phase 2: Core Features (Week 3-4)
+- [ ] All widget implementations
+- [ ] Multi-host configuration
+- [ ] Historical data storage
+- [ ] Alert system integration
+- [ ] Configuration management
+
+**Deliverables:**
+- Full-featured dashboard
+- Multi-host monitoring
+- Historical trending
+- Configuration file support
+
+### Phase 3: Advanced Features (Week 5-6)
+- [ ] Predictive analytics
+- [ ] Custom alert rules
+- [ ] Export capabilities
+- [ ] Performance optimizations
+- [ ] Error handling & resilience
+
+**Deliverables:**
+- Production-ready dashboard
+- Advanced monitoring features
+- Comprehensive error handling
+- Performance benchmarks
+
+### Phase 4: Polish & Documentation (Week 7-8)
+- [ ] Code documentation
+- [ ] User documentation
+- [ ] Installation scripts
+- [ ] Testing suite
+- [ ] Release preparation
+
+**Deliverables:**
+- Complete documentation
+- Installation packages
+- Test coverage
+- Release v1.0
+
+## Configuration
+
+### Host Configuration (config/hosts.toml)
+```toml
+[hosts]
+
+[hosts.srv01]
+name = "srv01"
+address = "192.168.30.100"
+smart_api = 6127
+service_api = 6128
+backup_api = 6129
+role = "server"
+
+[hosts.cmbox]
+name = "cmbox"
+address = "192.168.30.101"
+smart_api = 6127
+service_api = 6128
+backup_api = 6129
+role = "workstation"
+
+[hosts.labbox]
+name = "labbox" 
+address = "192.168.30.102"
+smart_api = 6127
+service_api = 6128
+backup_api = 6129
+role = "lab"
+```
+
+### Dashboard Configuration (config/dashboard.toml)
+```toml
+[dashboard]
+refresh_interval = 5  # seconds
+history_retention = 7  # days
+theme = "dark"
+
+[widgets]
+nvme_wear_threshold = 70
+temperature_threshold = 70
+memory_warning_threshold = 80
+memory_critical_threshold = 90
+
+[alerts]
+email_enabled = true
+sound_enabled = false
+desktop_notifications = true
+```
+
+## Key Features
+
+### Real-time Monitoring
+- **Auto-refresh** configurable intervals (1-60 seconds)
+- **Async data fetching** from multiple hosts simultaneously
+- **Connection status** indicators for each host
+- **Graceful degradation** when hosts are unreachable
+
+### Historical Tracking
+- **SQLite database** for local storage
+- **Trend analysis** for wear levels and resource usage
+- **Retention policies** configurable per metric type
+- **Export capabilities** (CSV, JSON)
+
+### Alert System
+- **Threshold-based alerts** for all metrics
+- **Email integration** with existing notification system
+- **Alert acknowledgment** and history
+- **Custom alert rules** with logical operators
+
+### Multi-Host Management
+- **Auto-discovery** of hosts on network
+- **Host grouping** by role (server, workstation, lab)
+- **Bulk operations** across multiple hosts
+- **Host-specific configurations**
+
+## Performance Requirements
+
+### Resource Usage
+- **Memory**: < 50MB runtime footprint
+- **CPU**: < 1% average CPU usage
+- **Network**: Minimal bandwidth (< 1KB/s per host)
+- **Startup**: < 2 seconds cold start
+
+### Responsiveness
+- **UI updates**: 60 FPS smooth rendering
+- **Data refresh**: < 500ms API response handling
+- **Navigation**: Instant keyboard response
+- **Error recovery**: < 5 seconds reconnection
+
+## Security Considerations
+
+### Network Security
+- **Local network only** - no external connections
+- **Authentication** for API access if implemented
+- **Encrypted storage** for sensitive configuration
+- **Audit logging** for administrative actions
+
+### Data Privacy
+- **Local storage** only - no cloud dependencies
+- **Configurable retention** for historical data
+- **Secure deletion** of expired data
+- **No sensitive data logging**
+
+## Testing Strategy
+
+### Unit Tests
+- API client modules
+- Data parsing and validation
+- Configuration management
+- Alert logic
+
+### Integration Tests
+- Multi-host connectivity
+- API error handling
+- Database operations
+- Alert delivery
+
+### Performance Tests
+- Memory usage under load
+- Network timeout handling
+- Large dataset rendering
+- Extended runtime stability
+
+## Deployment
+
+### Installation
+```bash
+# Development build
+cargo build --release
+
+# Install from source
+cargo install --path .
+
+# Future: Package distribution
+# Package for NixOS inclusion
+```
+
+### Usage
+```bash
+# Start dashboard
+cm-dashboard
+
+# Specify config
+cm-dashboard --config /path/to/config
+
+# Single host mode
+cm-dashboard --host srv01
+
+# Debug mode
+cm-dashboard --verbose
+```
+
+## Maintenance
+
+### Regular Tasks
+- **Database cleanup** - automated retention policies
+- **Log rotation** - configurable log levels and retention
+- **Configuration validation** - startup configuration checks
+- **Performance monitoring** - built-in metrics for dashboard itself
+
+### Updates
+- **Auto-update checks** - optional feature
+- **Configuration migration** - version compatibility
+- **API compatibility** - backwards compatibility with monitoring APIs
+- **Feature toggles** - enable/disable features without rebuild
+
+## Future Enhancements
+
+### Proposed: ZMQ Metrics Agent Architecture
+
+#### **Current Limitations of HTTP-based APIs**
+- **Performance overhead**: Python scripts with HTTP servers on each host
+- **Network complexity**: Multiple firewall ports (6127-6129) per host
+- **Polling inefficiency**: Manual refresh cycles instead of real-time streaming
+- **Scalability concerns**: Resource usage grows linearly with hosts
+
+#### **Proposed: Rust ZMQ Gossip Network**
+
+**Core Concept**: Replace HTTP polling with a peer-to-peer ZMQ gossip network where lightweight Rust agents stream metrics in real-time.
+
+```
+┌─────────┐    ┌─────────┐    ┌─────────┐    ┌─────────┐
+│  cmbox  │<-->│ labbox  │<-->│ srv01   │<-->│steambox │
+│ :6130   │    │ :6130   │    │ :6130   │    │ :6130   │
+└─────────┘    └─────────┘    └─────────┘    └─────────┘
+      ^                            ^              ^
+      └────────────────────────────┼──────────────┘
+                                   v
+                              ┌─────────┐
+                              │simonbox │
+                              │ :6130   │
+                              └─────────┘
+```
+
+**Architecture Benefits**:
+- **No central router**: Peer-to-peer gossip eliminates single point of failure
+- **Self-healing**: Network automatically routes around failed hosts
+- **Real-time streaming**: Metrics pushed immediately on change
+- **Performance**: Rust agents ~10-100x faster than Python
+- **Simplified networking**: Single ZMQ port (6130) vs multiple HTTP ports
+- **Lower resource usage**: Minimal memory/CPU footprint per agent
+
+#### **Implementation Plan**
+
+**Phase 1: Agent Development**
+```rust
+// Lightweight agent on each host
+pub struct MetricsAgent {
+    neighbors: Vec<String>,           // ["srv01:6130", "cmbox:6130"]
+    collectors: Vec<Box<dyn Collector>>, // SMART, Service, Backup
+    gossip_interval: Duration,        // How often to broadcast
+    zmq_context: zmq::Context,
+}
+
+// Message format for metrics
+#[derive(Serialize, Deserialize)]
+struct MetricsMessage {
+    hostname: String,
+    agent_type: AgentType,     // Smart, Service, Backup
+    timestamp: u64,
+    metrics: MetricsData,
+    hop_count: u8,             // Prevent infinite loops
+}
+```
+
+**Phase 2: Dashboard Integration**
+- **ZMQ Subscriber**: Dashboard subscribes to gossip stream on srv01
+- **Real-time updates**: WebSocket connection to TUI for live streaming
+- **Historical storage**: Optional persistence layer for trending
+
+**Phase 3: Migration Strategy**
+- **Parallel deployment**: Run ZMQ agents alongside existing HTTP APIs
+- **A/B comparison**: Validate metrics accuracy and performance
+- **Gradual cutover**: Switch dashboard to ZMQ, then remove HTTP services
+
+#### **Configuration Integration**
+
+**Agent Configuration** (per-host):
+```toml
+[metrics_agent]
+enabled = true
+port = 6130
+neighbors = ["srv01:6130", "cmbox:6130"]  # Redundant connections
+role = "agent"  # or "dashboard" for srv01
+
+[collectors]
+smart_metrics = { enabled = true, interval_ms = 5000 }
+service_metrics = { enabled = true, interval_ms = 2000 }  # srv01 only
+backup_metrics = { enabled = true, interval_ms = 30000 }  # srv01 only
+```
+
+**Dashboard Configuration** (updated):
+```toml
+[data_source]
+type = "zmq_gossip"  # vs current "http_polling"
+listen_port = 6130
+buffer_size = 1000
+real_time_updates = true
+
+[legacy_support]
+http_apis_enabled = true  # For migration period
+fallback_to_http = true   # If ZMQ unavailable
+```
+
+#### **Performance Comparison**
+
+| Metric | Current (HTTP) | Proposed (ZMQ) |
+|--------|---------------|----------------|
+| Collection latency | ~50ms | ~1ms |
+| Network overhead | HTTP headers + JSON | Binary ZMQ frames |
+| Resource per host | ~5MB (Python + HTTP) | ~1MB (Rust agent) |
+| Update frequency | 5s polling | Real-time push |
+| Network ports | 3 per host | 1 per host |
+| Failure recovery | Manual retry | Auto-reconnect |
+
+#### **Development Roadmap**
+
+**Week 1-2**: Basic ZMQ agent
+- Rust binary with ZMQ gossip protocol
+- SMART metrics collection
+- Configuration management
+
+**Week 3-4**: Dashboard integration  
+- ZMQ subscriber in cm-dashboard
+- Real-time TUI updates
+- Parallel HTTP/ZMQ operation
+
+**Week 5-6**: Production readiness
+- Service/backup metrics support
+- Error handling and resilience
+- Performance benchmarking
+
+**Week 7-8**: Migration and cleanup
+- Switch dashboard to ZMQ-only
+- Remove legacy HTTP APIs
+- Documentation and deployment
+
+### Potential Features
+- **Plugin system** for custom widgets
+- **REST API** for external integrations
+- **Mobile companion app** for alerts
+- **Grafana integration** for advanced graphing
+- **Prometheus metrics export**
+- **Custom scripting** for automated responses
+- **Machine learning** for predictive analytics
+- **Clustering support** for high availability
+
+### Integration Opportunities
+- **Home Assistant** integration
+- **Slack/Discord** notifications
+- **SNMP support** for network equipment
+- **Docker/Kubernetes** container monitoring
+- **Cloud metrics** integration (if needed)
+
+## Success Metrics
+
+### Technical Success
+- **Zero crashes** during normal operation
+- **Sub-second response** times for all operations
+- **99.9% uptime** for monitoring (excluding network issues)
+- **Minimal resource usage** as specified
+
+### User Success
+- **Faster problem detection** compared to Glance
+- **Reduced time to resolution** for issues
+- **Improved infrastructure awareness**
+- **Enhanced operational efficiency**
+
+---
+
+## Development Log
+
+### Project Initialization
+- Repository created: `/home/cm/projects/cm-dashboard`
+- Initial planning: TUI dashboard to replace Glance
+- Technology selected: Rust + ratatui
+- Architecture designed: Multi-host monitoring with existing API integration
+
+### Current Status (HTTP-based)
+- **Functional TUI**: Basic dashboard rendering with ratatui
+- **HTTP API integration**: Connects to ports 6127, 6128, 6129
+- **Multi-host support**: Configurable host management
+- **Async architecture**: Tokio-based concurrent metrics fetching
+- **Configuration system**: TOML-based host and dashboard configuration
+
+### Proposed Evolution: ZMQ Agent System
+
+**Rationale for Change**: The current HTTP polling approach has fundamental limitations:
+1. **Latency**: 5-second refresh cycles miss rapid changes
+2. **Resource overhead**: Python HTTP servers consume unnecessary resources
+3. **Network complexity**: Multiple ports per host complicate firewall management
+4. **Scalability**: Linear resource growth with host count
+
+**Solution**: Peer-to-peer ZMQ gossip network with Rust agents provides:
+- **Real-time streaming**: Sub-second metric propagation
+- **Fault tolerance**: Network self-heals around failed hosts
+- **Performance**: Native Rust speed vs interpreted Python
+- **Simplicity**: Single port per host, no central coordination
+
+### ZMQ Agent Development Plan
+
+**Component 1: cm-metrics-agent** (New Rust binary)
+```toml
+[package]
+name = "cm-metrics-agent"
+version = "0.1.0"
+
+[dependencies]
+zmq = "0.10"
+serde = { version = "1.0", features = ["derive"] }
+tokio = { version = "1.0", features = ["full"] }
+smartmontools-rs = "0.1"  # Or direct smartctl bindings
+```
+
+**Component 2: Dashboard Integration** (Update cm-dashboard)
+- Add ZMQ subscriber mode alongside HTTP client
+- Implement real-time metric streaming
+- Provide migration path from HTTP to ZMQ
+
+**Migration Strategy**:
+1. **Phase 1**: Deploy agents alongside existing APIs
+2. **Phase 2**: Switch dashboard to ZMQ mode
+3. **Phase 3**: Remove HTTP APIs from NixOS configurations
+
+**Performance Targets**:
+- **Agent footprint**: < 2MB RAM, < 1% CPU
+- **Metric latency**: < 100ms propagation across network
+- **Network efficiency**: < 1KB/s per host steady state
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--- a/Cargo.toml
+++ b/Cargo.toml
@ -0,0 +1,19 @@
+[package]
+name = "cm-dashboard"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ratatui = "0.24"
+crossterm = "0.27"
+tokio = { version = "1.0", features = ["full"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+clap = { version = "4.0", features = ["derive"] }
+anyhow = "1.0"
+chrono = { version = "0.4", features = ["serde"] }
+toml = "0.8"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
+tracing-appender = "0.2"
+zmq = "0.10"
--- a/README.md
+++ b/README.md
@ -1,3 +1,135 @@
-# cm-dashboard
+# CM Dashboard

-Linux TUI dashboard for host health overview
+CM Dashboard is a Rust-powered terminal UI for real-time monitoring of CMTEC infrastructure hosts. It aggregates SMART, service, and backup metrics from the existing CMTEC APIs and presents them in an efficient, keyboard-driven interface built with `ratatui`.
+
+```
+┌──────────────────────────────────────────────────────────────────────────────┐
+│ CM Dashboard                                                                │
+├────────────────────────────┬────────────────────────────┬────────────────────┤
+│ NVMe Health                │ Services                   │ Memory Optimization │
+│ Host: srv01                │ Host: srv01                │ Host: srv01         │
+│ Status: Healthy            │ Services healthy: 5        │ Memory used: 2048 / │
+│ Drives healthy/warn/crit:  │ Degraded: 1 Failed: 0      │ 4096 MiB (50.0%)    │
+│ 4/0/0                      │ CPU top service: 71.3%     │ Last update: 12:34: │
+│ Capacity used: 512.0 /     │ Total memory: 1536 / 2048  │ 56                  │
+│ 2048.0 GiB                 │ MiB                        │                      │
+├────────────────────────────┴────────────┬───────────────┴────────────────────┤
+│ Backups                                  │ Alerts                          │
+│ Host: srv01                              │ srv01: OK                       │
+│ Status: Healthy                          │ labbox: smart warning           │
+│ Last success: 2024-02-01 03:12:45        │                                   │
+│ Snapshots: 17 • Size: 512.0 GiB          │                                   │
+│ Pending jobs: 0 (enabled: true)          │                                   │
+└──────────────────────────────┬───────────────────────────────────────────────┘
+│ Status                       │                                                │
+│ Active host: srv01 (1/3)     │ History retention ≈ 3600s                      │
+│ Config: config/dashboard.toml│ Default host: labbox                           │
+└──────────────────────────────┴───────────────────────────────────────────────┘
+```
+
+## Requirements
+
+- Rust toolchain 1.75+ (install via [`rustup`](https://rustup.rs))
+- Access to CMTEC monitoring APIs on ports 6127, 6128, and 6129 from the machine running the dashboard
+- Configuration files under `config/` describing hosts and dashboard preferences
+
+## Installation
+
+Clone the repository and build with Cargo:
+
+```bash
+git clone https://github.com/cmtec/cm-dashboard.git
+cd cm-dashboard
+cargo build --release
+```
+
+The optimized binary is available at `target/release/cm-dashboard`. To install into your Cargo bin directory:
+
+```bash
+cargo install --path .
+```
+
+## Configuration
+
+On first launch, the dashboard will create `config/dashboard.toml` and `config/hosts.toml` automatically if they do not exist.
+
+You can also generate starter configuration files manually with the built-in helper:
+
+```bash
+cargo run -- init-config
+# or, once installed
+cm-dashboard init-config --dir ./config --force
+```
+
+This produces `config/dashboard.toml` and `config/hosts.toml`. The primary dashboard config looks like:
+
+```toml
+[hosts]
+default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+enabled = true
+
+[[hosts.hosts]]
+name = "labbox"
+enabled = true
+
+[dashboard]
+tick_rate_ms = 250
+history_duration_minutes = 60
+
+[[dashboard.widgets]]
+id = "nvme"
+enabled = true
+
+[[dashboard.widgets]]
+id = "alerts"
+enabled = true
+
+[data_source]
+kind = "zmq"
+
+[data_source.zmq]
+endpoints = ["tcp://127.0.0.1:6130"]
+```
+
+Adjust the host list and `data_source.zmq.endpoints` to match your CMTEC gossip network. If you prefer to manage hosts separately, edit the generated `hosts.toml` file.
+
+## Features
+
+- Rotating host selection with left/right arrows (`←`, `→`, `h`, `l`, `Tab`)
+- Live NVMe, service, memory, backup, and alert summaries per active host
+- Structured logging with `tracing` (`-v`/`-vv` to increase verbosity)
+- Help overlay (`?`) outlining keyboard shortcuts
+- Config-driven host discovery via `config/dashboard.toml`
+
+## Getting Started
+
+```bash
+cargo run -- --config config/dashboard.toml
+# specify a single host
+cargo run -- --host srv01
+# override ZMQ endpoints at runtime
+cargo run -- --zmq-endpoint tcp://srv01:6130,tcp://labbox:6130
+# increase logging verbosity
+cargo run -- -v
+```
+
+### Keyboard Shortcuts
+
+| Key | Action |
+| --- | --- |
+| `←` / `h` | Previous host |
+| `→` / `l` / `Tab` | Next host |
+| `?` | Toggle help overlay |
+| `r` | Update status message |
+| `q` / `Esc` | Quit |
+
+## Development
+
+- Format: `cargo fmt`
+- Check: `cargo check`
+- Run: `cargo run`
+
+The dashboard subscribes to the CMTEC ZMQ gossip network (default `tcp://127.0.0.1:6130`). Received metrics are cached per host and retained in an in-memory ring buffer for future trend analysis.
--- a/config/dashboard.example.toml
+++ b/config/dashboard.example.toml
@ -0,0 +1,44 @@
+# CM Dashboard configuration template
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+enabled = true
+# metadata = { rack = "R1" }
+
+[[hosts.hosts]]
+name = "labbox"
+enabled = true
+
+[dashboard]
+tick_rate_ms = 250
+history_duration_minutes = 60
+
+[[dashboard.widgets]]
+id = "nvme"
+enabled = true
+
+[[dashboard.widgets]]
+id = "services"
+enabled = true
+
+[[dashboard.widgets]]
+id = "backup"
+enabled = true
+
+[[dashboard.widgets]]
+id = "alerts"
+enabled = true
+
+[data_source]
+kind = "zmq"
+
+[data_source.zmq]
+endpoints = ["tcp://127.0.0.1:6130"]
+# subscribe = ""
+
+[filesystem]
+# cache_dir = "/var/lib/cm-dashboard/cache"
+# history_dir = "/var/lib/cm-dashboard/history"
--- a/config/dashboard.toml
+++ b/config/dashboard.toml
@ -0,0 +1,39 @@
+# CM Dashboard configuration
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+base_url = "http://srv01.local"
+enabled = true
+# metadata = { rack = "R1" }
+
+[[hosts.hosts]]
+name = "labbox"
+base_url = "http://labbox.local"
+enabled = true
+
+[dashboard]
+tick_rate_ms = 250
+history_duration_minutes = 60
+
+[[dashboard.widgets]]
+id = "nvme"
+enabled = true
+
+[[dashboard.widgets]]
+id = "services"
+enabled = true
+
+[[dashboard.widgets]]
+id = "backup"
+enabled = true
+
+[[dashboard.widgets]]
+id = "alerts"
+enabled = true
+
+[filesystem]
+# cache_dir = "/var/lib/cm-dashboard/cache"
+# history_dir = "/var/lib/cm-dashboard/history"
--- a/config/hosts.example.toml
+++ b/config/hosts.example.toml
@ -0,0 +1,12 @@
+# Hosts configuration template (optional if you want a separate hosts file)
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+enabled = true
+
+[[hosts.hosts]]
+name = "labbox"
+enabled = true
--- a/config/hosts.toml
+++ b/config/hosts.toml
@ -0,0 +1,14 @@
+# Optional separate hosts configuration
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+base_url = "http://srv01.local"
+enabled = true
+
+[[hosts.hosts]]
+name = "labbox"
+base_url = "http://labbox.local"
+enabled = true
--- a/src/app.rs
+++ b/src/app.rs
@ -0,0 +1,483 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::time::{Duration, Instant};
+
+use anyhow::Result;
+use chrono::{DateTime, Utc};
+use crossterm::event::{KeyCode, KeyEvent, KeyEventKind};
+
+use crate::config;
+use crate::data::config::{AppConfig, DataSourceKind, HostTarget, ZmqConfig};
+use crate::data::history::MetricsHistory;
+use crate::data::metrics::{BackupMetrics, ServiceMetrics, SmartMetrics};
+
+/// Shared application settings derived from the CLI arguments.
+#[derive(Debug, Clone)]
+pub struct AppOptions {
+    pub config: Option<PathBuf>,
+    pub host: Option<String>,
+    pub tick_rate: Duration,
+    pub verbosity: u8,
+    pub zmq_endpoints_override: Vec<String>,
+}
+
+impl AppOptions {
+    pub fn tick_rate(&self) -> Duration {
+        self.tick_rate
+    }
+}
+
+#[derive(Debug, Default)]
+struct HostRuntimeState {
+    last_success: Option<DateTime<Utc>>,
+    last_error: Option<String>,
+    smart: Option<SmartMetrics>,
+    services: Option<ServiceMetrics>,
+    backup: Option<BackupMetrics>,
+}
+
+/// Top-level application state container.
+#[derive(Debug)]
+pub struct App {
+    options: AppOptions,
+    config: Option<AppConfig>,
+    active_config_path: Option<PathBuf>,
+    hosts: Vec<HostTarget>,
+    history: MetricsHistory,
+    host_states: HashMap<String, HostRuntimeState>,
+    zmq_endpoints: Vec<String>,
+    zmq_subscription: Option<String>,
+    zmq_connected: bool,
+    active_host_index: usize,
+    show_help: bool,
+    should_quit: bool,
+    last_tick: Instant,
+    tick_count: u64,
+    status: String,
+}
+
+impl App {
+    pub fn new(options: AppOptions) -> Result<Self> {
+        let (config, active_config_path) = Self::load_configuration(options.config.as_ref())?;
+
+        let hosts = Self::select_hosts(options.host.as_ref(), config.as_ref());
+        let history_capacity = Self::history_capacity_hint(config.as_ref());
+        let history = MetricsHistory::with_capacity(history_capacity);
+        let host_states = hosts
+            .iter()
+            .map(|host| (host.name.clone(), HostRuntimeState::default()))
+            .collect::<HashMap<_, _>>();
+
+        let (mut zmq_endpoints, zmq_subscription) = Self::resolve_zmq_config(config.as_ref());
+        if !options.zmq_endpoints_override.is_empty() {
+            zmq_endpoints = options.zmq_endpoints_override.clone();
+        }
+
+        let status = Self::build_initial_status(options.host.as_ref(), active_config_path.as_ref());
+
+        Ok(Self {
+            options,
+            config,
+            active_config_path,
+            hosts,
+            history,
+            host_states,
+            zmq_endpoints,
+            zmq_subscription,
+            zmq_connected: false,
+            active_host_index: 0,
+            show_help: false,
+            should_quit: false,
+            last_tick: Instant::now(),
+            tick_count: 0,
+            status,
+        })
+    }
+
+    pub fn on_tick(&mut self) {
+        self.tick_count = self.tick_count.saturating_add(1);
+        self.last_tick = Instant::now();
+        let host_count = self.hosts.len();
+        let retention = self.history.retention();
+        self.status = format!(
+            "Monitoring • hosts: {} • ticks: {} • refresh: {:?} • retention: {:?}",
+            host_count, self.tick_count, self.options.tick_rate, retention
+        );
+    }
+
+    pub fn handle_key_event(&mut self, key: KeyEvent) {
+        if key.kind != KeyEventKind::Press {
+            return;
+        }
+
+        match key.code {
+            KeyCode::Char('q') | KeyCode::Char('Q') | KeyCode::Esc => {
+                self.should_quit = true;
+                self.status = "Exiting…".to_string();
+            }
+            KeyCode::Char('r') | KeyCode::Char('R') => {
+                self.status = "Manual refresh requested".to_string();
+            }
+            KeyCode::Left | KeyCode::Char('h') => {
+                self.select_previous_host();
+            }
+            KeyCode::Right | KeyCode::Char('l') | KeyCode::Tab => {
+                self.select_next_host();
+            }
+            KeyCode::Char('?') => {
+                self.show_help = !self.show_help;
+            }
+            _ => {}
+        }
+    }
+
+    pub fn should_quit(&self) -> bool {
+        self.should_quit
+    }
+
+    pub fn status_text(&self) -> &str {
+        &self.status
+    }
+
+    pub fn zmq_connected(&self) -> bool {
+        self.zmq_connected
+    }
+
+    pub fn tick_rate(&self) -> Duration {
+        self.options.tick_rate()
+    }
+
+    pub fn config(&self) -> Option<&AppConfig> {
+        self.config.as_ref()
+    }
+
+    pub fn active_config_path(&self) -> Option<&PathBuf> {
+        self.active_config_path.as_ref()
+    }
+
+    pub fn hosts(&self) -> &[HostTarget] {
+        &self.hosts
+    }
+
+    pub fn active_host_info(&self) -> Option<(usize, &HostTarget)> {
+        if self.hosts.is_empty() {
+            None
+        } else {
+            let index = self
+                .active_host_index
+                .min(self.hosts.len().saturating_sub(1));
+            Some((index, &self.hosts[index]))
+        }
+    }
+
+    pub fn history(&self) -> &MetricsHistory {
+        &self.history
+    }
+
+    pub fn host_display_data(&self) -> Vec<HostDisplayData> {
+        self.hosts
+            .iter()
+            .filter_map(|host| {
+                self.host_states
+                    .get(&host.name)
+                    .map(|state| HostDisplayData {
+                        name: host.name.clone(),
+                        last_success: state.last_success.clone(),
+                        last_error: state.last_error.clone(),
+                        smart: state.smart.clone(),
+                        services: state.services.clone(),
+                        backup: state.backup.clone(),
+                    })
+            })
+            .collect()
+    }
+
+    pub fn active_host_display(&self) -> Option<HostDisplayData> {
+        self.active_host_info().and_then(|(_, host)| {
+            self.host_states
+                .get(&host.name)
+                .map(|state| HostDisplayData {
+                    name: host.name.clone(),
+                    last_success: state.last_success.clone(),
+                    last_error: state.last_error.clone(),
+                    smart: state.smart.clone(),
+                    services: state.services.clone(),
+                    backup: state.backup.clone(),
+                })
+        })
+    }
+
+    pub fn zmq_context(&self) -> Option<ZmqContext> {
+        if self.zmq_endpoints.is_empty() {
+            return None;
+        }
+
+        Some(ZmqContext::new(
+            self.zmq_endpoints.clone(),
+            self.zmq_subscription.clone(),
+        ))
+    }
+
+    pub fn handle_app_event(&mut self, event: AppEvent) {
+        match event {
+            AppEvent::MetricsUpdated {
+                host,
+                smart,
+                services,
+                backup,
+                timestamp,
+            } => {
+                self.zmq_connected = true;
+                self.ensure_host_entry(&host);
+                let state = self.host_states.entry(host.clone()).or_default();
+                state.last_success = Some(timestamp);
+                state.last_error = None;
+
+                if let Some(mut smart_metrics) = smart {
+                    if smart_metrics.timestamp != timestamp {
+                        smart_metrics.timestamp = timestamp;
+                    }
+                    let snapshot = smart_metrics.clone();
+                    self.history.record_smart(smart_metrics);
+                    state.smart = Some(snapshot);
+                }
+
+                if let Some(mut service_metrics) = services {
+                    if service_metrics.timestamp != timestamp {
+                        service_metrics.timestamp = timestamp;
+                    }
+                    let snapshot = service_metrics.clone();
+                    self.history.record_services(service_metrics);
+                    state.services = Some(snapshot);
+                }
+
+                if let Some(mut backup_metrics) = backup {
+                    if backup_metrics.timestamp != timestamp {
+                        backup_metrics.timestamp = timestamp;
+                    }
+                    let snapshot = backup_metrics.clone();
+                    self.history.record_backup(backup_metrics);
+                    state.backup = Some(snapshot);
+                }
+
+                self.status = format!(
+                    "Metrics update • host: {} • at {}",
+                    host,
+                    timestamp.format("%H:%M:%S")
+                );
+            }
+            AppEvent::MetricsFailed {
+                host,
+                error,
+                timestamp,
+            } => {
+                self.zmq_connected = false;
+                self.ensure_host_entry(&host);
+                let state = self.host_states.entry(host.clone()).or_default();
+                state.last_error = Some(format!("{} at {}", error, timestamp.format("%H:%M:%S")));
+
+                self.status = format!("Fetch failed • host: {} • {}", host, error);
+            }
+        }
+    }
+
+    pub fn help_visible(&self) -> bool {
+        self.show_help
+    }
+
+    fn ensure_host_entry(&mut self, host: &str) {
+        if !self.host_states.contains_key(host) {
+            self.host_states
+                .insert(host.to_string(), HostRuntimeState::default());
+        }
+
+        if self.hosts.iter().any(|entry| entry.name == host) {
+            return;
+        }
+
+        self.hosts.push(HostTarget::from_name(host.to_string()));
+        if self.hosts.len() == 1 {
+            self.active_host_index = 0;
+        }
+    }
+
+    fn load_configuration(path: Option<&PathBuf>) -> Result<(Option<AppConfig>, Option<PathBuf>)> {
+        if let Some(explicit) = path {
+            let config = config::load_from_path(explicit)?;
+            return Ok((Some(config), Some(explicit.clone())));
+        }
+
+        let default_path = PathBuf::from("config/dashboard.toml");
+        if default_path.exists() {
+            let config = config::load_from_path(&default_path)?;
+            return Ok((Some(config), Some(default_path)));
+        }
+
+        Ok((None, None))
+    }
+
+    fn build_initial_status(host: Option<&String>, config_path: Option<&PathBuf>) -> String {
+        match (host, config_path) {
+            (Some(host), Some(path)) => {
+                format!("Ready • host: {} • config: {}", host, path.display())
+            }
+            (Some(host), None) => format!("Ready • host: {}", host),
+            (None, Some(path)) => format!("Ready • config: {}", path.display()),
+            (None, None) => "Ready • no host selected".to_string(),
+        }
+    }
+
+    fn select_hosts(host: Option<&String>, config: Option<&AppConfig>) -> Vec<HostTarget> {
+        let mut targets = Vec::new();
+
+        let Some(config) = config else {
+            return targets;
+        };
+
+        let host_filter = host.map(|value| value.to_lowercase());
+
+        for entry in &config.hosts.hosts {
+            if !entry.enabled {
+                continue;
+            }
+
+            if let Some(filter) = &host_filter {
+                if entry.name.to_lowercase() != *filter {
+                    continue;
+                }
+            }
+
+            targets.push(entry.clone());
+        }
+
+        if targets.is_empty() {
+            if let Some(default_host) = &config.hosts.default_host {
+                if host_filter.is_none() {
+                    if let Some(entry) = config.hosts.hosts.iter().find(|candidate| {
+                        candidate.enabled && candidate.name.eq_ignore_ascii_case(default_host)
+                    }) {
+                        targets.push(entry.clone());
+                    }
+                }
+            }
+        }
+
+        targets
+    }
+
+    fn history_capacity_hint(config: Option<&AppConfig>) -> usize {
+        const DEFAULT_CAPACITY: usize = 120;
+        const SAMPLE_SECONDS: u64 = 30;
+
+        let Some(config) = config else {
+            return DEFAULT_CAPACITY;
+        };
+
+        let minutes = config.dashboard.history_duration_minutes.max(1);
+        let total_seconds = minutes.saturating_mul(60);
+        let samples = total_seconds / SAMPLE_SECONDS;
+        usize::try_from(samples.max(1)).unwrap_or(DEFAULT_CAPACITY)
+    }
+
+    fn select_previous_host(&mut self) {
+        if self.hosts.is_empty() {
+            return;
+        }
+
+        self.active_host_index = if self.active_host_index == 0 {
+            self.hosts.len().saturating_sub(1)
+        } else {
+            self.active_host_index - 1
+        };
+        self.status = format!(
+            "Active host switched to {} ({}/{})",
+            self.hosts[self.active_host_index].name,
+            self.active_host_index + 1,
+            self.hosts.len()
+        );
+    }
+
+    fn select_next_host(&mut self) {
+        if self.hosts.is_empty() {
+            return;
+        }
+
+        self.active_host_index = (self.active_host_index + 1) % self.hosts.len();
+        self.status = format!(
+            "Active host switched to {} ({}/{})",
+            self.hosts[self.active_host_index].name,
+            self.active_host_index + 1,
+            self.hosts.len()
+        );
+    }
+
+    fn resolve_zmq_config(config: Option<&AppConfig>) -> (Vec<String>, Option<String>) {
+        let default = ZmqConfig::default();
+        let zmq_config = config
+            .and_then(|cfg| {
+                if cfg.data_source.kind == DataSourceKind::Zmq {
+                    Some(cfg.data_source.zmq.clone())
+                } else {
+                    None
+                }
+            })
+            .unwrap_or(default);
+
+        let endpoints = if zmq_config.endpoints.is_empty() {
+            ZmqConfig::default().endpoints
+        } else {
+            zmq_config.endpoints.clone()
+        };
+
+        (endpoints, zmq_config.subscribe.clone())
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct HostDisplayData {
+    pub name: String,
+    pub last_success: Option<DateTime<Utc>>,
+    pub last_error: Option<String>,
+    pub smart: Option<SmartMetrics>,
+    pub services: Option<ServiceMetrics>,
+    pub backup: Option<BackupMetrics>,
+}
+
+#[derive(Debug, Clone)]
+pub struct ZmqContext {
+    endpoints: Vec<String>,
+    subscription: Option<String>,
+}
+
+impl ZmqContext {
+    pub fn new(endpoints: Vec<String>, subscription: Option<String>) -> Self {
+        Self {
+            endpoints,
+            subscription,
+        }
+    }
+
+    pub fn endpoints(&self) -> &[String] {
+        &self.endpoints
+    }
+
+    pub fn subscription(&self) -> Option<&str> {
+        self.subscription.as_deref()
+    }
+}
+
+#[derive(Debug)]
+pub enum AppEvent {
+    MetricsUpdated {
+        host: String,
+        smart: Option<SmartMetrics>,
+        services: Option<ServiceMetrics>,
+        backup: Option<BackupMetrics>,
+        timestamp: DateTime<Utc>,
+    },
+    MetricsFailed {
+        host: String,
+        error: String,
+        timestamp: DateTime<Utc>,
+    },
+}
--- a/src/config.rs
+++ b/src/config.rs
@ -0,0 +1,19 @@
+#![allow(dead_code)]
+
+use std::fs;
+use std::path::Path;
+
+use anyhow::{Context, Result};
+
+use crate::data::config::AppConfig;
+
+/// Load application configuration from a TOML file.
+pub fn load_from_path(path: &Path) -> Result<AppConfig> {
+    let raw = fs::read_to_string(path)
+        .with_context(|| format!("failed to read configuration file at {}", path.display()))?;
+
+    let config = toml::from_str::<AppConfig>(&raw)
+        .with_context(|| format!("failed to parse configuration file {}", path.display()))?;
+
+    Ok(config)
+}
--- a/src/data/config.rs
+++ b/src/data/config.rs
@ -0,0 +1,138 @@
+#![allow(dead_code)]
+
+use std::collections::HashMap;
+use std::path::PathBuf;
+
+use serde::Deserialize;
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct HostsConfig {
+    pub default_host: Option<String>,
+    #[serde(default)]
+    pub hosts: Vec<HostTarget>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct HostTarget {
+    pub name: String,
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    #[serde(default)]
+    pub metadata: HashMap<String, String>,
+}
+
+impl HostTarget {
+    pub fn from_name(name: String) -> Self {
+        Self {
+            name,
+            enabled: true,
+            metadata: HashMap::new(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct DashboardConfig {
+    #[serde(default = "default_tick_rate_ms")]
+    pub tick_rate_ms: u64,
+    #[serde(default)]
+    pub history_duration_minutes: u64,
+    #[serde(default)]
+    pub widgets: Vec<WidgetConfig>,
+}
+
+impl Default for DashboardConfig {
+    fn default() -> Self {
+        Self {
+            tick_rate_ms: default_tick_rate_ms(),
+            history_duration_minutes: 60,
+            widgets: Vec::new(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct WidgetConfig {
+    pub id: String,
+    #[serde(default)]
+    pub enabled: bool,
+    #[serde(default)]
+    pub options: HashMap<String, String>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct AppFilesystem {
+    pub cache_dir: Option<PathBuf>,
+    pub history_dir: Option<PathBuf>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct AppConfig {
+    pub hosts: HostsConfig,
+    #[serde(default)]
+    pub dashboard: DashboardConfig,
+    #[serde(default = "default_data_source_config")]
+    pub data_source: DataSourceConfig,
+    #[serde(default)]
+    pub filesystem: Option<AppFilesystem>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct DataSourceConfig {
+    #[serde(default = "default_data_source_kind")]
+    pub kind: DataSourceKind,
+    #[serde(default)]
+    pub zmq: ZmqConfig,
+}
+
+impl Default for DataSourceConfig {
+    fn default() -> Self {
+        Self {
+            kind: DataSourceKind::Zmq,
+            zmq: ZmqConfig::default(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum DataSourceKind {
+    Zmq,
+}
+
+fn default_data_source_kind() -> DataSourceKind {
+    DataSourceKind::Zmq
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ZmqConfig {
+    #[serde(default = "default_zmq_endpoints")]
+    pub endpoints: Vec<String>,
+    #[serde(default)]
+    pub subscribe: Option<String>,
+}
+
+impl Default for ZmqConfig {
+    fn default() -> Self {
+        Self {
+            endpoints: default_zmq_endpoints(),
+            subscribe: None,
+        }
+    }
+}
+
+const fn default_true() -> bool {
+    true
+}
+
+const fn default_tick_rate_ms() -> u64 {
+    500
+}
+
+fn default_data_source_config() -> DataSourceConfig {
+    DataSourceConfig::default()
+}
+
+fn default_zmq_endpoints() -> Vec<String> {
+    vec!["tcp://127.0.0.1:6130".to_string()]
+}
--- a/src/data/history.rs
+++ b/src/data/history.rs
@ -0,0 +1,54 @@
+#![allow(dead_code)]
+
+use std::collections::VecDeque;
+use std::time::Duration;
+
+use chrono::{DateTime, Utc};
+
+use crate::data::metrics::{BackupMetrics, ServiceMetrics, SmartMetrics};
+
+/// Ring buffer for retaining recent samples for trend analysis.
+#[derive(Debug)]
+pub struct MetricsHistory {
+    capacity: usize,
+    smart: VecDeque<(DateTime<Utc>, SmartMetrics)>,
+    services: VecDeque<(DateTime<Utc>, ServiceMetrics)>,
+    backups: VecDeque<(DateTime<Utc>, BackupMetrics)>,
+}
+
+impl MetricsHistory {
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self {
+            capacity,
+            smart: VecDeque::with_capacity(capacity),
+            services: VecDeque::with_capacity(capacity),
+            backups: VecDeque::with_capacity(capacity),
+        }
+    }
+
+    pub fn record_smart(&mut self, metrics: SmartMetrics) {
+        let entry = (Utc::now(), metrics);
+        Self::push_with_limit(&mut self.smart, entry, self.capacity);
+    }
+
+    pub fn record_services(&mut self, metrics: ServiceMetrics) {
+        let entry = (Utc::now(), metrics);
+        Self::push_with_limit(&mut self.services, entry, self.capacity);
+    }
+
+    pub fn record_backup(&mut self, metrics: BackupMetrics) {
+        let entry = (Utc::now(), metrics);
+        Self::push_with_limit(&mut self.backups, entry, self.capacity);
+    }
+
+    pub fn retention(&self) -> Duration {
+        Duration::from_secs((self.capacity as u64) * 30)
+    }
+
+    fn push_with_limit<T>(deque: &mut VecDeque<T>, item: T, capacity: usize) {
+        if deque.len() == capacity {
+            deque.pop_front();
+        }
+        deque.push_back(item);
+    }
+}
--- a/src/data/metrics.rs
+++ b/src/data/metrics.rs
@ -0,0 +1,96 @@
+#![allow(dead_code)]
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SmartMetrics {
+    pub status: String,
+    pub drives: Vec<DriveInfo>,
+    pub summary: DriveSummary,
+    pub issues: Vec<String>,
+    pub timestamp: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DriveInfo {
+    pub name: String,
+    pub temperature_c: f32,
+    pub wear_level: f32,
+    pub power_on_hours: u64,
+    pub available_spare: f32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DriveSummary {
+    pub healthy: usize,
+    pub warning: usize,
+    pub critical: usize,
+    pub capacity_total_gb: f32,
+    pub capacity_used_gb: f32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ServiceMetrics {
+    pub summary: ServiceSummary,
+    pub services: Vec<ServiceInfo>,
+    pub timestamp: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ServiceSummary {
+    pub healthy: usize,
+    pub degraded: usize,
+    pub failed: usize,
+    pub memory_used_mb: f32,
+    pub memory_quota_mb: f32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ServiceInfo {
+    pub name: String,
+    pub status: ServiceStatus,
+    pub memory_used_mb: f32,
+    pub memory_quota_mb: f32,
+    pub cpu_percent: f32,
+    pub sandbox_limit: Option<f32>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum ServiceStatus {
+    Running,
+    Degraded,
+    Restarting,
+    Stopped,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BackupMetrics {
+    pub overall_status: BackupStatus,
+    pub backup: BackupInfo,
+    pub service: BackupServiceInfo,
+    pub timestamp: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BackupInfo {
+    pub last_success: Option<DateTime<Utc>>,
+    pub last_failure: Option<DateTime<Utc>>,
+    pub size_gb: f32,
+    pub snapshot_count: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BackupServiceInfo {
+    pub enabled: bool,
+    pub pending_jobs: u32,
+    pub last_message: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum BackupStatus {
+    Healthy,
+    Warning,
+    Failed,
+    Unknown,
+}
--- a/src/data/mod.rs
+++ b/src/data/mod.rs
@ -0,0 +1,3 @@
+pub mod config;
+pub mod history;
+pub mod metrics;
--- a/src/main.rs
+++ b/src/main.rs
@ -0,0 +1,492 @@
+mod app;
+mod config;
+mod data;
+mod ui;
+
+use std::fs;
+use std::io::{self, Stdout};
+use std::path::{Path, PathBuf};
+use std::sync::OnceLock;
+use std::time::Duration;
+
+use crate::data::metrics::{BackupMetrics, ServiceMetrics, SmartMetrics};
+use anyhow::{anyhow, Context, Result};
+use chrono::{TimeZone, Utc};
+use clap::{ArgAction, Parser, Subcommand};
+use crossterm::event::{self, Event};
+use crossterm::terminal::{disable_raw_mode, enable_raw_mode};
+use crossterm::{execute, terminal};
+use ratatui::backend::CrosstermBackend;
+use ratatui::Terminal;
+use serde::Deserialize;
+use serde_json::Value;
+use tokio::sync::mpsc::{
+    error::TryRecvError, unbounded_channel, UnboundedReceiver, UnboundedSender,
+};
+use tokio::task::spawn_blocking;
+use tracing::{debug, warn};
+use tracing_appender::non_blocking::WorkerGuard;
+use tracing_subscriber::EnvFilter;
+use zmq::{Context as NativeZmqContext, Message as NativeZmqMessage};
+
+use crate::app::{App, AppEvent, AppOptions, ZmqContext};
+
+static LOG_GUARD: OnceLock<WorkerGuard> = OnceLock::new();
+
+#[derive(Parser, Debug)]
+#[command(
+    name = "cm-dashboard",
+    version,
+    about = "Infrastructure monitoring TUI for CMTEC"
+)]
+struct Cli {
+    #[command(subcommand)]
+    command: Option<Command>,
+    /// Optional path to configuration TOML file
+    #[arg(long, value_name = "FILE")]
+    config: Option<PathBuf>,
+
+    /// Limit dashboard to a single host
+    #[arg(short = 'H', long, value_name = "HOST")]
+    host: Option<String>,
+
+    /// Interval (ms) to refresh dashboard when idle
+    #[arg(long, default_value_t = 250)]
+    tick_rate: u64,
+
+    /// Increase logging verbosity (-v, -vv)
+    #[arg(short, long, action = ArgAction::Count)]
+    verbose: u8,
+
+    /// Override ZMQ endpoints (comma-separated)
+    #[arg(long, value_delimiter = ',', value_name = "ENDPOINT")]
+    zmq_endpoint: Vec<String>,
+}
+
+#[derive(Subcommand, Debug)]
+enum Command {
+    /// Generate default configuration files
+    InitConfig {
+        #[arg(long, value_name = "DIR", default_value = "config")]
+        dir: PathBuf,
+        /// Overwrite existing files if they already exist
+        #[arg(long, action = ArgAction::SetTrue)]
+        force: bool,
+    },
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    if let Some(Command::InitConfig { dir, force }) = cli.command.as_ref() {
+        init_tracing(cli.verbose)?;
+        generate_config_templates(dir, *force)?;
+        return Ok(());
+    }
+
+    ensure_default_config(&cli)?;
+
+    let options = AppOptions {
+        config: cli.config,
+        host: cli.host,
+        tick_rate: Duration::from_millis(cli.tick_rate.max(16)),
+        verbosity: cli.verbose,
+        zmq_endpoints_override: cli.zmq_endpoint,
+    };
+
+    init_tracing(options.verbosity)?;
+
+    let mut app = App::new(options)?;
+    let (event_tx, mut event_rx) = unbounded_channel();
+
+    if let Some(context) = app.zmq_context() {
+        spawn_metrics_task(context, event_tx.clone());
+    }
+
+    let mut terminal = setup_terminal()?;
+    let result = run_app(&mut terminal, &mut app, &mut event_rx);
+    teardown_terminal(terminal)?;
+    result
+}
+
+fn setup_terminal() -> Result<Terminal<CrosstermBackend<Stdout>>> {
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, terminal::EnterAlternateScreen)?;
+    let backend = CrosstermBackend::new(stdout);
+    let terminal = Terminal::new(backend)?;
+    Ok(terminal)
+}
+
+fn teardown_terminal(mut terminal: Terminal<CrosstermBackend<Stdout>>) -> Result<()> {
+    disable_raw_mode()?;
+    execute!(terminal.backend_mut(), terminal::LeaveAlternateScreen)?;
+    terminal.show_cursor()?;
+    Ok(())
+}
+
+fn run_app(
+    terminal: &mut Terminal<CrosstermBackend<Stdout>>,
+    app: &mut App,
+    event_rx: &mut UnboundedReceiver<AppEvent>,
+) -> Result<()> {
+    let tick_rate = app.tick_rate();
+
+    while !app.should_quit() {
+        drain_app_events(app, event_rx);
+        terminal.draw(|frame| ui::render(frame, app))?;
+
+        if event::poll(tick_rate)? {
+            if let Event::Key(key) = event::read()? {
+                app.handle_key_event(key);
+            }
+        } else {
+            app.on_tick();
+        }
+    }
+
+    Ok(())
+}
+
+fn drain_app_events(app: &mut App, receiver: &mut UnboundedReceiver<AppEvent>) {
+    loop {
+        match receiver.try_recv() {
+            Ok(event) => app.handle_app_event(event),
+            Err(TryRecvError::Empty) => break,
+            Err(TryRecvError::Disconnected) => break,
+        }
+    }
+}
+
+fn init_tracing(verbosity: u8) -> Result<()> {
+    let level = match verbosity {
+        0 => "warn",
+        1 => "info",
+        2 => "debug",
+        _ => "trace",
+    };
+
+    let env_filter = std::env::var("RUST_LOG")
+        .ok()
+        .and_then(|value| EnvFilter::try_new(value).ok())
+        .unwrap_or_else(|| EnvFilter::new(level));
+
+    let writer = prepare_log_writer()?;
+
+    tracing_subscriber::fmt()
+        .with_env_filter(env_filter)
+        .with_target(false)
+        .with_ansi(false)
+        .with_writer(writer)
+        .compact()
+        .try_init()
+        .map_err(|err| anyhow!(err))?;
+
+    Ok(())
+}
+
+fn prepare_log_writer() -> Result<tracing_appender::non_blocking::NonBlocking> {
+    let logs_dir = Path::new("logs");
+    if !logs_dir.exists() {
+        fs::create_dir_all(logs_dir).with_context(|| {
+            format!("failed to create logs directory at {}", logs_dir.display())
+        })?;
+    }
+
+    let file_appender = tracing_appender::rolling::never(logs_dir, "cm-dashboard.log");
+    let (non_blocking, guard) = tracing_appender::non_blocking(file_appender);
+    LOG_GUARD.get_or_init(|| guard);
+    Ok(non_blocking)
+}
+
+fn spawn_metrics_task(context: ZmqContext, sender: UnboundedSender<AppEvent>) {
+    tokio::spawn(async move {
+        match spawn_blocking(move || metrics_blocking_loop(context, sender)).await {
+            Ok(Ok(())) => {}
+            Ok(Err(error)) => warn!(%error, "ZMQ metrics worker exited with error"),
+            Err(join_error) => warn!(%join_error, "ZMQ metrics worker panicked"),
+        }
+    });
+}
+
+fn metrics_blocking_loop(context: ZmqContext, sender: UnboundedSender<AppEvent>) -> Result<()> {
+    let zmq_context = NativeZmqContext::new();
+    let socket = zmq_context
+        .socket(zmq::SUB)
+        .context("failed to create ZMQ SUB socket")?;
+
+    for endpoint in context.endpoints() {
+        debug!(%endpoint, "connecting to ZMQ endpoint");
+        socket
+            .connect(endpoint)
+            .with_context(|| format!("failed to connect to {endpoint}"))?;
+    }
+
+    if let Some(prefix) = context.subscription() {
+        socket
+            .set_subscribe(prefix.as_bytes())
+            .context("failed to set ZMQ subscription")?;
+    } else {
+        socket
+            .set_subscribe(b"")
+            .context("failed to subscribe to all ZMQ topics")?;
+    }
+
+    loop {
+        match socket.recv_msg(0) {
+            Ok(message) => {
+                if let Err(error) = handle_zmq_message(&message, &sender) {
+                    warn!(%error, "failed to handle ZMQ message");
+                }
+            }
+            Err(error) => {
+                warn!(%error, "ZMQ receive error");
+                std::thread::sleep(Duration::from_secs(1));
+            }
+        }
+    }
+}
+
+fn handle_zmq_message(
+    message: &NativeZmqMessage,
+    sender: &UnboundedSender<AppEvent>,
+) -> Result<()> {
+    let bytes = message.to_vec();
+
+    let envelope: MetricsEnvelope =
+        serde_json::from_slice(&bytes).with_context(|| "failed to deserialize metrics envelope")?;
+    let timestamp = Utc
+        .timestamp_opt(envelope.timestamp as i64, 0)
+        .single()
+        .unwrap_or_else(|| Utc::now());
+
+    let host = envelope.hostname.clone();
+
+    let mut payload = envelope.metrics;
+    if let Some(obj) = payload.as_object_mut() {
+        obj.entry("timestamp")
+            .or_insert_with(|| Value::String(timestamp.to_rfc3339()));
+    }
+
+    match envelope.agent_type {
+        AgentType::Smart => match serde_json::from_value::<SmartMetrics>(payload.clone()) {
+            Ok(metrics) => {
+                let _ = sender.send(AppEvent::MetricsUpdated {
+                    host,
+                    smart: Some(metrics),
+                    services: None,
+                    backup: None,
+                    timestamp,
+                });
+            }
+            Err(error) => {
+                warn!(%error, "failed to parse smart metrics");
+                let _ = sender.send(AppEvent::MetricsFailed {
+                    host,
+                    error: format!("smart metrics parse error: {error:#}"),
+                    timestamp,
+                });
+            }
+        },
+        AgentType::Service => match serde_json::from_value::<ServiceMetrics>(payload.clone()) {
+            Ok(metrics) => {
+                let _ = sender.send(AppEvent::MetricsUpdated {
+                    host,
+                    smart: None,
+                    services: Some(metrics),
+                    backup: None,
+                    timestamp,
+                });
+            }
+            Err(error) => {
+                warn!(%error, "failed to parse service metrics");
+                let _ = sender.send(AppEvent::MetricsFailed {
+                    host,
+                    error: format!("service metrics parse error: {error:#}"),
+                    timestamp,
+                });
+            }
+        },
+        AgentType::Backup => match serde_json::from_value::<BackupMetrics>(payload.clone()) {
+            Ok(metrics) => {
+                let _ = sender.send(AppEvent::MetricsUpdated {
+                    host,
+                    smart: None,
+                    services: None,
+                    backup: Some(metrics),
+                    timestamp,
+                });
+            }
+            Err(error) => {
+                warn!(%error, "failed to parse backup metrics");
+                let _ = sender.send(AppEvent::MetricsFailed {
+                    host,
+                    error: format!("backup metrics parse error: {error:#}"),
+                    timestamp,
+                });
+            }
+        },
+    }
+
+    Ok(())
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "snake_case")]
+enum AgentType {
+    Smart,
+    Service,
+    Backup,
+}
+
+#[derive(Debug, Deserialize)]
+struct MetricsEnvelope {
+    hostname: String,
+    #[serde(rename = "agent_type")]
+    agent_type: AgentType,
+    timestamp: u64,
+    metrics: Value,
+}
+
+fn ensure_default_config(cli: &Cli) -> Result<()> {
+    if let Some(path) = cli.config.as_ref() {
+        ensure_config_at(path, false)?;
+    } else {
+        let default_path = Path::new("config/dashboard.toml");
+        if !default_path.exists() {
+            generate_config_templates(Path::new("config"), false)?;
+            println!("Created default configuration in ./config");
+        }
+    }
+
+    Ok(())
+}
+
+fn ensure_config_at(path: &Path, force: bool) -> Result<()> {
+    if path.exists() && !force {
+        return Ok(());
+    }
+
+    if let Some(parent) = path.parent() {
+        if !parent.exists() {
+            fs::create_dir_all(parent)
+                .with_context(|| format!("failed to create directory {}", parent.display()))?;
+        }
+
+        write_template(path.to_path_buf(), DASHBOARD_TEMPLATE, force, "dashboard")?;
+
+        let hosts_path = parent.join("hosts.toml");
+        if !hosts_path.exists() || force {
+            write_template(hosts_path, HOSTS_TEMPLATE, force, "hosts")?;
+        }
+        println!(
+            "Created configuration templates in {} (dashboard: {})",
+            parent.display(),
+            path.display()
+        );
+    } else {
+        return Err(anyhow!("invalid configuration path {}", path.display()));
+    }
+
+    Ok(())
+}
+
+fn generate_config_templates(target_dir: &Path, force: bool) -> Result<()> {
+    if !target_dir.exists() {
+        fs::create_dir_all(target_dir)
+            .with_context(|| format!("failed to create directory {}", target_dir.display()))?;
+    }
+
+    write_template(
+        target_dir.join("dashboard.toml"),
+        DASHBOARD_TEMPLATE,
+        force,
+        "dashboard",
+    )?;
+    write_template(
+        target_dir.join("hosts.toml"),
+        HOSTS_TEMPLATE,
+        force,
+        "hosts",
+    )?;
+
+    println!(
+        "Configuration templates written to {}",
+        target_dir.display()
+    );
+
+    Ok(())
+}
+
+fn write_template(path: PathBuf, contents: &str, force: bool, name: &str) -> Result<()> {
+    if path.exists() && !force {
+        return Err(anyhow!(
+            "{} template already exists at {} (use --force to overwrite)",
+            name,
+            path.display()
+        ));
+    }
+
+    fs::write(&path, contents)
+        .with_context(|| format!("failed to write {} template to {}", name, path.display()))?;
+
+    Ok(())
+}
+
+const DASHBOARD_TEMPLATE: &str = r#"# CM Dashboard configuration
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+base_url = "http://srv01.local"
+enabled = true
+# metadata = { rack = "R1" }
+
+[[hosts.hosts]]
+name = "labbox"
+base_url = "http://labbox.local"
+enabled = true
+
+[dashboard]
+tick_rate_ms = 250
+history_duration_minutes = 60
+
+[[dashboard.widgets]]
+id = "nvme"
+enabled = true
+
+[[dashboard.widgets]]
+id = "services"
+enabled = true
+
+[[dashboard.widgets]]
+id = "backup"
+enabled = true
+
+[[dashboard.widgets]]
+id = "alerts"
+enabled = true
+
+[filesystem]
+# cache_dir = "/var/lib/cm-dashboard/cache"
+# history_dir = "/var/lib/cm-dashboard/history"
+"#;
+
+const HOSTS_TEMPLATE: &str = r#"# Optional separate hosts configuration
+
+[hosts]
+# default_host = "srv01"
+
+[[hosts.hosts]]
+name = "srv01"
+base_url = "http://srv01.local"
+enabled = true
+
+[[hosts.hosts]]
+name = "labbox"
+base_url = "http://labbox.local"
+enabled = true
+"#;
--- a/src/ui/alerts.rs
+++ b/src/ui/alerts.rs
@ -0,0 +1,51 @@
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
+use ratatui::Frame;
+
+use crate::app::HostDisplayData;
+
+pub fn render(frame: &mut Frame, hosts: &[HostDisplayData], area: Rect) {
+    let block = Block::default()
+        .title("Alerts")
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::LightRed));
+
+    let mut lines = Vec::new();
+
+    if hosts.is_empty() {
+        lines.push(Line::from("No hosts configured"));
+    } else {
+        for host in hosts {
+            if let Some(error) = &host.last_error {
+                lines.push(Line::from(vec![
+                    Span::styled(&host.name, Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(": "),
+                    Span::styled(error, Style::default().fg(Color::Red)),
+                ]));
+                continue;
+            }
+
+            if let Some(smart) = host.smart.as_ref() {
+                if let Some(issue) = smart.issues.first() {
+                    lines.push(Line::from(vec![
+                        Span::styled(&host.name, Style::default().add_modifier(Modifier::BOLD)),
+                        Span::raw(": "),
+                        Span::styled(issue, Style::default().fg(Color::Yellow)),
+                    ]));
+                    continue;
+                }
+            }
+
+            lines.push(Line::from(vec![
+                Span::styled(&host.name, Style::default().add_modifier(Modifier::BOLD)),
+                Span::raw(": OK"),
+            ]));
+        }
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(paragraph, area);
+}
--- a/src/ui/backup.rs
+++ b/src/ui/backup.rs
@ -0,0 +1,62 @@
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
+use ratatui::Frame;
+
+use crate::app::HostDisplayData;
+
+pub fn render(frame: &mut Frame, host: Option<&HostDisplayData>, area: Rect) {
+    let block = Block::default()
+        .title("Backups")
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::LightGreen));
+
+    let mut lines = Vec::new();
+
+    match host {
+        Some(data) => {
+            if let Some(metrics) = data.backup.as_ref() {
+                lines.push(Line::from(vec![
+                    Span::styled("Host: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(data.name.clone()),
+                ]));
+                lines.push(Line::from(format!("Status: {:?}", metrics.overall_status)));
+
+                if let Some(last_success) = metrics.backup.last_success.as_ref() {
+                    lines.push(Line::from(format!(
+                        "Last success: {}",
+                        last_success.format("%Y-%m-%d %H:%M:%S")
+                    )));
+                }
+
+                if let Some(last_failure) = metrics.backup.last_failure.as_ref() {
+                    lines.push(Line::from(vec![
+                        Span::styled("Last failure: ", Style::default().fg(Color::Red)),
+                        Span::raw(last_failure.format("%Y-%m-%d %H:%M:%S").to_string()),
+                    ]));
+                }
+
+                lines.push(Line::from(format!(
+                    "Snapshots: {} • Size: {:.1} GiB",
+                    metrics.backup.snapshot_count, metrics.backup.size_gb
+                )));
+
+                lines.push(Line::from(format!(
+                    "Pending jobs: {} (enabled: {})",
+                    metrics.service.pending_jobs, metrics.service.enabled
+                )));
+            } else {
+                lines.push(Line::from(format!(
+                    "Host {} awaiting backup metrics",
+                    data.name
+                )));
+            }
+        }
+        None => lines.push(Line::from("No hosts configured")),
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(paragraph, area);
+}
--- a/src/ui/dashboard.rs
+++ b/src/ui/dashboard.rs
@ -0,0 +1,190 @@
+use ratatui::layout::{Constraint, Direction, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::Span;
+use ratatui::widgets::Block;
+use ratatui::Frame;
+
+use crate::app::App;
+
+use super::{alerts, backup, memory, nvme, services};
+
+pub fn render(frame: &mut Frame, app: &App) {
+    let host_summaries = app.host_display_data();
+    let primary_host = app.active_host_display();
+
+    let root_block = Block::default().title(Span::styled(
+        "CM Dashboard",
+        Style::default()
+            .fg(Color::Cyan)
+            .add_modifier(Modifier::BOLD),
+    ));
+
+    let size = frame.size();
+    frame.render_widget(root_block, size);
+
+    let outer = inner_rect(size);
+
+    let vertical_chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Percentage(35),
+            Constraint::Percentage(35),
+            Constraint::Percentage(30),
+        ])
+        .split(outer);
+
+    let top = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)])
+        .split(vertical_chunks[0]);
+
+    let middle = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)])
+        .split(vertical_chunks[1]);
+
+    let bottom = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)])
+        .split(vertical_chunks[2]);
+
+    nvme::render(frame, primary_host.as_ref(), top[0]);
+    services::render(frame, primary_host.as_ref(), top[1]);
+    memory::render(frame, primary_host.as_ref(), middle[0]);
+    backup::render(frame, primary_host.as_ref(), middle[1]);
+    alerts::render(frame, &host_summaries, bottom[0]);
+    render_status(frame, app, bottom[1]);
+
+    if app.help_visible() {
+        render_help(frame, size);
+    }
+}
+
+fn render_status(frame: &mut Frame, app: &App, area: Rect) {
+    use ratatui::text::Line;
+    use ratatui::widgets::{Paragraph, Wrap};
+
+    let mut lines = Vec::new();
+    lines.push(Line::from(app.status_text().to_string()));
+
+    if app.zmq_connected() {
+        lines.push(Line::from(vec![
+            Span::styled(
+                "Data source: ",
+                Style::default().add_modifier(Modifier::BOLD),
+            ),
+            Span::styled("ZMQ", Style::default().fg(Color::Green)),
+        ]));
+    } else {
+        lines.push(Line::from(vec![
+            Span::styled(
+                "Data source: ",
+                Style::default().add_modifier(Modifier::BOLD),
+            ),
+            Span::styled("ZMQ (disconnected)", Style::default().fg(Color::Red)),
+        ]));
+    }
+
+    if let Some((index, host)) = app.active_host_info() {
+        lines.push(Line::from(format!(
+            "Active host: {} ({}/{})",
+            host.name,
+            index + 1,
+            app.hosts().len()
+        )));
+    } else {
+        lines.push(Line::from("Active host: —"));
+    }
+
+    if let Some(path) = app.active_config_path() {
+        lines.push(Line::from(vec![
+            Span::styled("Config: ", Style::default().add_modifier(Modifier::BOLD)),
+            Span::raw(path.display().to_string()),
+        ]));
+    }
+
+    let retention = app.history().retention();
+    lines.push(Line::from(format!(
+        "History retention ≈ {}s",
+        retention.as_secs()
+    )));
+
+    if let Some(config) = app.config() {
+        if let Some(default_host) = &config.hosts.default_host {
+            lines.push(Line::from(format!("Default host: {}", default_host)));
+        }
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(
+        Block::default()
+            .title(Span::styled(
+                "Status",
+                Style::default()
+                    .fg(Color::Green)
+                    .add_modifier(Modifier::BOLD),
+            ))
+            .borders(ratatui::widgets::Borders::ALL),
+    );
+
+    frame.render_widget(paragraph, area);
+}
+
+fn inner_rect(area: Rect) -> Rect {
+    Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    }
+}
+
+fn render_help(frame: &mut Frame, area: Rect) {
+    use ratatui::text::Line;
+    use ratatui::widgets::{Block, Borders, Clear, Paragraph, Wrap};
+
+    let help_area = centered_rect(60, 40, area);
+    let lines = vec![
+        Line::from("Keyboard Shortcuts"),
+        Line::from("←/→ or h/l: Switch active host"),
+        Line::from("r: Manual refresh status"),
+        Line::from("?: Toggle this help"),
+        Line::from("q / Esc: Quit dashboard"),
+    ];
+
+    let block = Block::default()
+        .title(Span::styled(
+            "Help",
+            Style::default()
+                .fg(Color::White)
+                .add_modifier(Modifier::BOLD),
+        ))
+        .borders(Borders::ALL)
+        .style(Style::default().bg(Color::Black));
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(Clear, help_area);
+    frame.render_widget(paragraph, help_area);
+}
+
+fn centered_rect(percent_x: u16, percent_y: u16, area: Rect) -> Rect {
+    let vertical = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Percentage((100 - percent_y) / 2),
+            Constraint::Percentage(percent_y),
+            Constraint::Percentage((100 - percent_y) / 2),
+        ])
+        .split(area);
+
+    let horizontal = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([
+            Constraint::Percentage((100 - percent_x) / 2),
+            Constraint::Percentage(percent_x),
+            Constraint::Percentage((100 - percent_x) / 2),
+        ])
+        .split(vertical[1]);
+
+    horizontal[1]
+}
--- a/src/ui/memory.rs
+++ b/src/ui/memory.rs
@ -0,0 +1,56 @@
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
+use ratatui::Frame;
+
+use crate::app::HostDisplayData;
+
+pub fn render(frame: &mut Frame, host: Option<&HostDisplayData>, area: Rect) {
+    let block = Block::default()
+        .title("Memory Optimization")
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::LightMagenta));
+
+    let mut lines = Vec::new();
+
+    match host {
+        Some(data) => {
+            if let Some(metrics) = data.services.as_ref() {
+                let summary = &metrics.summary;
+                let usage_ratio = if summary.memory_quota_mb > 0.0 {
+                    (summary.memory_used_mb / summary.memory_quota_mb) * 100.0
+                } else {
+                    0.0
+                };
+
+                lines.push(Line::from(vec![
+                    Span::styled("Host: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(data.name.clone()),
+                ]));
+
+                lines.push(Line::from(format!(
+                    "Memory used: {:.1} / {:.1} MiB ({:.1}%)",
+                    summary.memory_used_mb, summary.memory_quota_mb, usage_ratio
+                )));
+
+                if let Some(last_success) = data.last_success.as_ref() {
+                    lines.push(Line::from(format!(
+                        "Last update: {}",
+                        last_success.format("%H:%M:%S")
+                    )));
+                }
+            } else {
+                lines.push(Line::from(format!(
+                    "Host {} awaiting service metrics",
+                    data.name
+                )));
+            }
+        }
+        None => lines.push(Line::from("No hosts configured")),
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(paragraph, area);
+}
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@ -0,0 +1,8 @@
+pub mod alerts;
+pub mod backup;
+pub mod dashboard;
+pub mod memory;
+pub mod nvme;
+pub mod services;
+
+pub use dashboard::render;
--- a/src/ui/nvme.rs
+++ b/src/ui/nvme.rs
@ -0,0 +1,58 @@
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
+use ratatui::Frame;
+
+use crate::app::HostDisplayData;
+
+pub fn render(frame: &mut Frame, host: Option<&HostDisplayData>, area: Rect) {
+    let block = Block::default()
+        .title("NVMe Health")
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::LightCyan));
+
+    let mut lines = Vec::new();
+
+    match host {
+        Some(data) => {
+            if let Some(metrics) = data.smart.as_ref() {
+                lines.push(Line::from(vec![
+                    Span::styled("Host: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(data.name.clone()),
+                ]));
+                lines.push(Line::from(vec![
+                    Span::styled("Status: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(metrics.status.clone()),
+                ]));
+                lines.push(Line::from(format!(
+                    "Drives healthy/warn/crit: {}/{}/{}",
+                    metrics.summary.healthy, metrics.summary.warning, metrics.summary.critical
+                )));
+                lines.push(Line::from(format!(
+                    "Capacity used: {:.1} / {:.1} GiB",
+                    metrics.summary.capacity_used_gb, metrics.summary.capacity_total_gb
+                )));
+
+                if let Some(issue) = metrics.issues.first() {
+                    lines.push(Line::from(vec![
+                        Span::styled("Issue: ", Style::default().fg(Color::Yellow)),
+                        Span::raw(issue.clone()),
+                    ]));
+                }
+            } else {
+                lines.push(Line::from(format!(
+                    "Host {} has no SMART data yet",
+                    data.name
+                )));
+            }
+        }
+        None => {
+            lines.push(Line::from("No hosts configured"));
+        }
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(paragraph, area);
+}
--- a/src/ui/services.rs
+++ b/src/ui/services.rs
@ -0,0 +1,54 @@
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
+use ratatui::Frame;
+
+use crate::app::HostDisplayData;
+
+pub fn render(frame: &mut Frame, host: Option<&HostDisplayData>, area: Rect) {
+    let block = Block::default()
+        .title("Services")
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::Yellow));
+
+    let mut lines = Vec::new();
+
+    match host {
+        Some(data) => {
+            if let Some(metrics) = data.services.as_ref() {
+                let summary = &metrics.summary;
+                lines.push(Line::from(vec![
+                    Span::styled("Host: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(data.name.clone()),
+                ]));
+                lines.push(Line::from(format!(
+                    "Services healthy/degraded/failed: {}/{}/{}",
+                    summary.healthy, summary.degraded, summary.failed
+                )));
+                lines.push(Line::from(format!(
+                    "CPU top service: {:.1}%",
+                    metrics
+                        .services
+                        .iter()
+                        .map(|svc| svc.cpu_percent)
+                        .fold(0.0_f32, f32::max)
+                )));
+                lines.push(Line::from(format!(
+                    "Total memory: {:.1} / {:.1} MiB",
+                    summary.memory_used_mb, summary.memory_quota_mb
+                )));
+            } else {
+                lines.push(Line::from(format!(
+                    "Host {} has no service metrics yet",
+                    data.name
+                )));
+            }
+        }
+        None => lines.push(Line::from("No hosts configured")),
+    }
+
+    let paragraph = Paragraph::new(lines).wrap(Wrap { trim: true }).block(block);
+
+    frame.render_widget(paragraph, area);
+}