High Availability Clusters with Eclipse Mosquitto

Reduce the chances of downtime and increase uptime operational performance

High Availability (HA) is the ability of a system to work at optimal performance continuously for a long period of time. This means that the systems should work without fail. The MQTT Mosquitto broker is designed to be stable and consistently functional by clustering. Two or more broker nodes form a cluster. When one node fails the other nodes take over (fail-over). Thus, reducing the chance of downtime and increasing uptime.

The broker cluster centrally manages:

Persistence of messages
Synchronization of nodes
Access Control Lists (ACL) for clients
Persistence of connections

How clustering works

Normal operation:

Current main node channels traffic
Other nodes in sleep mode
Synchronization via Cluster Management (CM):
- Messages
- Information on clients
- Overall cluster status

Fail-over operation: