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Architecture

Device Model IP Address Role
Pi 5 Raspberry Pi 5 (8GB) 192.168.50.1 Master node, backend, Hailo AI HAT+
Pi 4 Raspberry Pi 4 (4GB) 192.168.50.98 Camera node (IMX500) + ZeroMQ sender
Pi 3-1 Raspberry Pi 3B (1GB) 192.168.50.91 Worker node
Pi 3-2 Raspberry Pi 3B (1GB) 192.168.50.92 Worker node
Pi 3-3 Raspberry Pi 3B (1GB) 192.168.50.93 Worker node
Pi 3-4 Raspberry Pi 3B (1GB) 192.168.50.94 Worker node
Pi 3-5 Raspberry Pi 3B (1GB) 192.168.50.95 Worker node
Pi 3-6 Raspberry Pi 3B (1GB) 192.168.50.96 Worker node
Pi 3-7 Raspberry Pi 3B (1GB) 192.168.50.97 Worker node
Switch TP-Link TL-SG108E 192.168.50.104 8-port Gigabit switch

Additional Hardware

  • Hailo AI HAT+ (8L, 13 TOPS) — connected to Pi 5 via PCIe
  • Sony IMX500 AI Camera Module — connected to Pi 4
  • NVMe SSD (500GB) — connected to Pi 5 for MinIO storage
  • Gigabit Ethernet switch — TL-SG108E connecting all nodes

SSH Credentials

Device Username Password
Pi 5 pi < hidden >
Pi 3-1 pi3-1 < hidden >
Pi 3-2 pi3-2 < hidden >
Pi 3-3 pi3-3 < hidden >
Pi 3-4 pi3-4 < hidden >
Pi 3-5 pi3-5 < hidden >
Pi 3-6 pi3-6 < hidden >
Pi 3-7 pi3-7 < hidden >
Pi 4 pi < hidden >

All nodes are connected via a private Gigabit LAN on the 192.168.50.0/24 subnet.

DHCP/DNS Server (dnsmasq on Pi 5)

Pi 5 acts as DHCP server for the entire cluster. Configuration at /etc/dnsmasq.conf:

interface=eth0
bind-interfaces
dhcp-range=192.168.50.50,192.168.50.150,12h
dhcp-host=b8:27:eb:4b:43:2c,192.168.50.91,pi3-1
dhcp-host=b8:27:eb:39:15:74,192.168.50.92,pi3-2
dhcp-host=b8:27:eb:e7:78:92,192.168.50.93,pi3-3
dhcp-host=b8:27:eb:31:7a:10,192.168.50.94,pi3-4
dhcp-host=b8:27:eb:d4:aa:d7,192.168.50.95,pi3-5
dhcp-host=b8:27:eb:a5:ff:f4,192.168.50.96,pi3-6
dhcp-host=b8:27:eb:e3:a8:e9,192.168.50.97,pi3-7

MAC Address Table

Hostname MAC Address IP
pi3-1 b8:27:eb:4b:43:2c 192.168.50.91
pi3-2 b8:27:eb:39:15:74 192.168.50.92
pi3-3 b8:27:eb:e7:78:92 192.168.50.93
pi3-4 b8:27:eb:31:7a:10 192.168.50.94
pi3-5 b8:27:eb:d4:aa:d7 192.168.50.95
pi3-6 b8:27:eb:a5:ff:f4 192.168.50.96
pi3-7 b8:27:eb:e3:a8:e9 192.168.50.97

Static IP for Pi 5 eth0

Pi 5's ethernet interface must have a static IP. Configured via NetworkManager:

sudo nmcli con mod "Wired connection 1" ipv4.addresses 192.168.50.1/24 ipv4.method manual
sudo nmcli con up "Wired connection 1"

Internet Sharing (NAT)

Pi 5 shares internet from wlan1 to all Pi 3s via NAT:

sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -o wlan1 -j MASQUERADE
sudo iptables -I FORWARD 1 -i eth0 -o wlan1 -j ACCEPT
sudo iptables -I FORWARD 2 -i wlan1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT

Passwordless SSH

SSH keys are distributed from Pi 5 to all Pi 3s:

ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa
for i in 1 2 3 4 5 6 7; do
  sshpass -p "$PI_PASSWORD" ssh-copy-id -o StrictHostKeyChecking=no pi3-$i@192.168.50.$((90+i))
done