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Mosquitto Clustered Architecture for High Availability(HA) and Load Balancing(LB)

       Bridge Cluster – Set of active bridge nodes, broadcast incoming/published messages to remote nodes.
       Remote Cluster – Set of active remote nodes, Each remote node sends incoming messages to all subscribers of that particular node.
       HA Proxy Cluster – Set of HA proxy nodes in master-slave mode. Master is an active node handles all the requests in roundrobin fashion. Incase master goes down passive slave node gets elected as master.
       Keepalived – Linux library runs as a daemon in both active and passive haproxy nodes. It performs failover on transport layer.
       Virtual IP – Private network floating IP gets rotated in HA proxy cluster.  
       Public IP – Public IP is mapped to Virtual Private IP.
       Device/Gateway – Publish data to cluster over MQTT.
       Cloud Application – Subscribe to cluster for device data over MQTT  
Descriptions –
For above setup we need total 6 machines. One machine for each haproxy master and haproxy slave, 2 machines for mosquito bridge nodes to handle mqtt publish traffic and 2 machines for mosquitto remote nodes to handle mqtt subscribe traffic (note - specific to my usecase).
Here, all publish messages from device and applications are handled on port 1883 and subscribe messages on port 1884. 


  1. This is impressive, how many concurrent connections were you able to achieve. Can we add nodes dynamically like autoscaling? Also can you explain the need for bridge cluster and remote cluster? Is it that you are trying to sync a local broker with remote one? I am looking for a solution to load balance the MQTT connections to increase the concurrency.

  2. 10k concurrent connection and 10k simultaneously messages per second.

    Divided the Publish and Subscribe load using Bridge and Remote nodes respectively.

    1. If it needs another Haproxy cluster to proxy the Remote nodes for the Subscribe client to use.

  3. If you are able to provide that setup than its well and good


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