Kubernetes-Native High-Availability MQTT Broker Setup

This post details a fully declarative, Kubernetes-native setup for a highly available MQTT broker using Eclipse Mosquitto and Traefik. It leverages core Kubernetes primitives (Deployments, Services, ConfigMaps, and RBAC) to create a primary and secondary broker, ensuring near-zero downtime failover. A custom controller monitors the primary and switches traffic to the secondary within 5 seconds of failure, maintaining message continuity. Internal MQTT bridging ensures seamless message propagation between brokers, even during failover.