# Seattle Machine Monitoring Update

## Summary

Successfully updated the homelab monitoring system to replace the decommissioned VMI (100.99.156.20) with the reprovisioned Seattle machine (100.82.197.124).

## Changes Made

### 1. Prometheus Configuration Update

**File**: `/home/homelab/docker/monitoring/prometheus/prometheus.yml`

**Before**:
```yaml
- job_name: "vmi2076105-node"
  static_configs:
    - targets: ["100.99.156.20:9100"]
```

**After**:
```yaml
- job_name: "seattle-node"
  static_configs:
    - targets: ["100.82.197.124:9100"]
```

### 2. Seattle Machine Configuration

#### Node Exporter Installation
- Node exporter was already running on the Seattle machine
- Service status: `active (running)` on port 9100
- Binary location: `/usr/local/bin/node_exporter`

#### Firewall Configuration
Added UFW rule to allow Tailscale network access:
```bash
sudo ufw allow from 100.64.0.0/10 to any port 9100 comment 'Allow Tailscale to node_exporter'
```

#### SSH Access
- Accessible via `ssh seattle-tailscale` (configured in SSH config)
- Tailscale IP: 100.82.197.124
- Standard SSH key authentication

### 3. Monitoring Verification

#### Prometheus Targets Status
All monitoring targets are now healthy:
- **prometheus**: localhost:9090 ✅ UP
- **alertmanager**: alertmanager:9093 ✅ UP  
- **node-exporter**: localhost:9100 ✅ UP
- **calypso-node**: 100.75.252.64:9100 ✅ UP
- **seattle-node**: 100.82.197.124:9100 ✅ UP
- **proxmox-node**: 100.87.12.28:9100 ✅ UP

#### Metrics Collection
- Seattle machine metrics are being successfully scraped
- CPU, memory, disk, and network metrics available
- Historical data collection started immediately after configuration

## Technical Details

### Network Configuration
- **Tailscale Network**: 100.64.0.0/10
- **Seattle IP**: 100.82.197.124
- **Monitoring Port**: 9100 (node_exporter)
- **Protocol**: HTTP (internal network)

### Service Architecture
```
Prometheus (homelab) → Tailscale Network → Seattle Machine:9100 (node_exporter)
```

### Configuration Files Updated
1. `/home/homelab/docker/monitoring/prometheus/prometheus.yml` - Production config
2. `/home/homelab/organized/repos/homelab/prometheus/prometheus.yml` - Repository config
3. Fixed YAML indentation issues for alertmanager targets

## Verification Steps Completed

1. ✅ SSH connectivity to Seattle machine
2. ✅ Node exporter service running and accessible
3. ✅ Firewall rules configured for Tailscale access
4. ✅ Prometheus configuration updated and reloaded
5. ✅ Target health verification (UP status)
6. ✅ Metrics scraping confirmed
7. ✅ Repository configuration synchronized
8. ✅ Git commit with detailed change log

## Monitoring Capabilities

The Seattle machine now provides the following metrics:
- **System**: CPU usage, load average, uptime
- **Memory**: Total, available, used, cached
- **Disk**: Usage, I/O statistics, filesystem metrics
- **Network**: Interface statistics, traffic counters
- **Process**: Running processes, file descriptors

## Alert Coverage

The Seattle machine is now covered by all existing alert rules:
- **InstanceDown**: Triggers if node_exporter becomes unavailable
- **HighCPUUsage**: Alerts when CPU usage > 80% for 2+ minutes
- **HighMemoryUsage**: Alerts when memory usage > 90% for 2+ minutes  
- **DiskSpaceLow**: Alerts when root filesystem < 10% free space

## Next Steps

1. **Monitor Performance**: Watch Seattle machine metrics for baseline establishment
2. **Alert Tuning**: Adjust thresholds if needed based on Seattle machine characteristics
3. **Documentation**: This update is documented in the homelab repository
4. **Backup Verification**: Ensure Seattle machine is included in backup monitoring

## Rollback Plan

If issues arise, the configuration can be quickly reverted:

```bash
# Revert Prometheus config
cd /home/homelab/docker/monitoring
git checkout HEAD~1 prometheus/prometheus.yml
docker compose restart prometheus
```

## Contact Information

- **Updated By**: OpenHands Agent
- **Date**: February 15, 2026
- **Commit**: fee90008 - "Update monitoring: Replace VMI with Seattle machine"
- **Repository**: homelab.git

---

**Status**: ✅ COMPLETED SUCCESSFULLY
**Monitoring**: ✅ ACTIVE AND HEALTHY
**Documentation**: ✅ UPDATED