# 🥧 Raspberry Pi Systems

*Raspberry Pi devices and edge computing in the homelab*

## Overview
Documentation of Raspberry Pi systems providing edge computing, IoT services, and specialized workloads.

## Hardware Inventory

### Raspberry Pi 5 (Primary)
- **Model**: Raspberry Pi 5 8GB
- **CPU**: Broadcom BCM2712 (Quad-core ARM Cortex-A76)
- **RAM**: 8GB LPDDR4X
- **Storage**: 128GB microSD + USB SSD
- **Connectivity**: Gigabit Ethernet, WiFi 6, Bluetooth 5.0
- **Ports**: 2x USB 3.0, 2x USB 2.0, 2x micro-HDMI

### Raspberry Pi 4 (Secondary)
- **Model**: Raspberry Pi 4B 4GB/8GB variants
- **CPU**: Broadcom BCM2711 (Quad-core ARM Cortex-A72)
- **Use Cases**: Legacy services, testing, development

### Raspberry Pi Zero 2 W
- **Model**: Ultra-compact form factor
- **Use Cases**: IoT sensors, minimal services
- **Connectivity**: WiFi, Bluetooth

## Deployment Locations

### Edge Computing Nodes
- **Network monitoring**: Distributed monitoring points
- **IoT gateways**: Sensor data collection
- **Local services**: Reduce latency for local users

### Specialized Roles
- **Pi-hole DNS**: Network-wide ad blocking
- **VPN endpoints**: Remote access points
- **Environmental monitoring**: Temperature, humidity sensors

## Operating Systems

### Raspberry Pi OS
- **Base**: Debian-based official OS
- **Use Cases**: General purpose, desktop applications
- **Management**: Standard APT package management

### Ubuntu Server
- **Version**: Ubuntu Server 22.04 LTS ARM64
- **Use Cases**: Container workloads, server applications
- **Benefits**: Long-term support, enterprise features

### Specialized Distributions
- **DietPi**: Lightweight, optimized for Pi hardware
- **OpenWrt**: Network appliance functionality
- **Home Assistant OS**: Dedicated home automation

## Container Orchestration

### Docker Deployment
- **ARM64 containers**: Native ARM architecture support
- **Resource constraints**: Memory and CPU optimization
- **Storage optimization**: Minimize SD card wear

### Service Categories

#### Monitoring Services
- **Node Exporter**: System metrics collection
- **Prometheus**: Metrics storage and alerting
- **Grafana**: Visualization dashboards

#### Network Services
- **Pi-hole**: DNS filtering and ad blocking
- **Unbound**: Recursive DNS resolver
- **Tailscale**: Mesh VPN connectivity

#### IoT Services
- **Home Assistant**: Home automation platform
- **Zigbee2MQTT**: Zigbee device integration
- **InfluxDB**: Time-series data storage

## Performance Optimization

### Storage Optimization
- **USB SSD boot**: Faster than microSD
- **Log2RAM**: Reduce SD card writes
- **Swap optimization**: Minimize swap usage

### Thermal Management
- **Heatsinks**: Passive cooling solutions
- **Fan control**: Active cooling when needed
- **Thermal throttling**: Prevent overheating

### Power Management
- **Quality power supplies**: Stable 5V/3A supply
- **UPS integration**: Uninterruptible power supply
- **Power monitoring**: Track consumption

## Network Configuration

### Ethernet Connectivity
- **Gigabit Ethernet**: Primary network connection
- **VLAN support**: Network segmentation
- **Static IP assignment**: Consistent addressing

### Wireless Configuration
- **WiFi 6 support**: High-speed wireless (Pi 5)
- **Multiple SSIDs**: Network isolation
- **Mesh networking**: Extended coverage

## Monitoring & Management

### System Monitoring
- **Temperature monitoring**: Prevent thermal issues
- **CPU/memory usage**: Resource utilization
- **Storage health**: SD card/SSD monitoring

### Remote Management
- **SSH access**: Secure remote administration
- **VNC/RDP**: Graphical remote access
- **Ansible automation**: Configuration management

### Health Checks
- **Service availability**: Monitor running services
- **Network connectivity**: Ensure network access
- **Storage space**: Prevent disk full issues

## Maintenance Procedures

### Regular Updates
- **OS updates**: Security patches and improvements
- **Container updates**: Keep services current
- **Firmware updates**: EEPROM and bootloader

### Backup Strategies
- **SD card imaging**: Complete system backups
- **Configuration backups**: Service configurations
- **Data synchronization**: Important data backup

### Hardware Maintenance
- **Cleaning**: Dust removal from heatsinks
- **Connection checks**: Ensure secure connections
- **Storage replacement**: SD card/SSD replacement

## Use Cases

### Home Automation
- **Home Assistant**: Central automation hub
- **Device integration**: Zigbee, Z-Wave, WiFi devices
- **Automation rules**: Smart home logic

### Network Infrastructure
- **DNS services**: Pi-hole ad blocking
- **VPN services**: Remote access solutions
- **Network monitoring**: Traffic analysis

### Development & Testing
- **CI/CD runners**: Lightweight build agents
- **Testing environments**: Isolated test systems
- **Prototyping**: Hardware/software development

## Troubleshooting

### Common Issues
- **SD card corruption**: Use quality cards, minimize writes
- **Power issues**: Ensure adequate power supply
- **Thermal throttling**: Improve cooling solutions

### Recovery Procedures
- **Boot issues**: Recovery mode procedures
- **Network problems**: Reset network configuration
- **Service failures**: Container restart procedures

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**Status**: ✅ All Raspberry Pi systems operational with monitoring coverage