Cluster mode

The front part is the same as the stand-alone mode，ReferenceStandalone Mode。Cluster mode also starts two components ：Placement-Center and MQTT-Broker.

The difference between cluster mode and standalone mode is that cluster mode needs to launch multiple Placement Center and MQTT Broker nodes. When multiple nodes are started, they are automatically formed into a highly available cluster.

Start multiple placement-centers

shell

$ bin/robust-server place start config/example/mqtt-cluster/placement-center/node-1.toml
Starting placement-center with config: config/example/mqtt-cluster/placement-center/node-1.toml
Config:config/example/mqtt-cluster/placement-center/node-1.toml
placement-center started successfully.

Start sequentially: node2 and node3

shell

$ bin/robust-server place start config/example/mqtt-cluster/placement-center/node-2.toml
$ bin/robust-server place start config/example/mqtt-cluster/placement-center/node-3.toml

Check the Placement Center cluster status

shell

$ bin/robust-ctl place status
{"running_state":{"Ok":null},"id":1,"current_term":35,"vote":{"leader_id":{"term":35,"node_id":1},"committed":true},"last_log_index":1,"last_applied":{"leader_id":{"term":35,"node_id":1},"index":1},"snapshot":null,"purged":null,"state":"Leader","current_leader":1,"millis_since_quorum_ack":2,"last_quorum_acked":1742008607078799375,"membership_config":{"log_id":{"leader_id":{"term":0,"node_id":0},"index":0},"membership":{"configs":[[1,2,3]],"nodes":{"1":{"node_id":1,"rpc_addr":"127.0.0.1:1228"},"2":{"node_id":2,"rpc_addr":"127.0.0.1:2228"},"3":{"node_id":3,"rpc_addr":"127.0.0.1:3228"}}}},"heartbeat":{"1":1742008607081029875,"2":1742008607078799083,"3":1742008607078799083},"replication":{"1":{"leader_id":{"term":35,"node_id":1},"index":1},"2":{"leader_id":{"term":35,"node_id":1},"index":1},"3":{"leader_id":{"term":35,"node_id":1},"index":1}}}

Start multiple MQTT-Brokers

shell

$ bin/robust-server mqtt start config/example/mqtt-cluster/mqtt-server/node-1.toml
Starting mqtt-server with config: config/example/mqtt-cluster/mqtt-server/node-1.toml
Config:config/example/mqtt-cluster/mqtt-server/node-1.toml
mqtt-server started successfully.

Start broker2 and broker3 in turn

shell

$ bin/robust-server mqtt start config/example/mqtt-cluster/mqtt-server/node-2.toml
$ bin/robust-server mqtt start config/example/mqtt-cluster/mqtt-server/node-3.toml

View MQTT Broker cluster status

shell

$ bin/robust-ctl mqtt status
cluster name: mqtt-broker
node list:
- 172.20.10.5@1
- 172.20.10.5@2
- 172.20.10.5@3
MQTT broker cluster up and running

5.MQTT validation, view log, stop service ，ReferenceStandalone Mode.

Cluster mode ​

Cluster mode