Pi 5 Cluster

For the Porte Ouverte at Lycée Guillaume Kroll we linked several Raspberry Pi 5 boards into a K3s cluster. Instead of one device serving every visitor, the load is spread across the nodes — and if one Pi goes down, the others keep the site up.

What I learned

• Physically building and wiring a multi-node cluster
• Why load balancing matters, and what really happens when a node fails
• K3s is powerful but hard to debug at our level — which is why we want to try something simpler next

Next steps

• Rebuild it with Docker Swarm — simpler and closer to what we already know
• Add more nodes and run real containerised services on it, not just a load balancer
• Write it up as a guide the next BTS class can follow