The Ultimate Edge Cluster: Setting up a 3-Node Swarm on Raspberry Pi 5 (2026)

This guide walks through building a 3-node Docker Swarm cluster on Raspberry Pi 5 units for edge computing in 2026, choosing Swarm over Kubernetes to minimize resource overhead. It covers hardware selection (NVMe SSDs, PoE+ HATs), Swarm initialization, and edge-specific optimizations including node labeling, log rotation, and lightweight monitoring via SwarmCLI.