emqx4.3/rel/config/examples/cluster-with-etcd.conf.example

## Cluster discovery using 'etcd' service
## Connect to etcd over plain TCP (not TLS)

cluster {
    ## Human-friendly name of the EMQX cluster.
    name = emqxcl

    ## Service discovery method for the cluster nodes
    discovery_strategy = etcd

    ## If true, the node will try to heal network partitions automatically
    autoheal = true

    etcd {
      ## List of endpoint URLs of the etcd cluster
      ## Type: Comma Separated String
      server = "http://ur1,http://ur2"

      ## Key prefix used for EMQX service discovery
      prefix = emqxcl

      ## Expiration time of the etcd key associated with the node
      node_ttl = 1m
    }
}