So, I installed oss-7.9 on two VMs with RH8.
All I want is a cluster with two nodes, of which one acts as a replica.
I have the same config on both VMs, though of course with different IPs and node names, differences are shown in brackets:
cluster.name: "cluster-3" node.name: "node-1" ["node-2"] network.host: 10.0.2.39 [10.0.2.32] http.port: 9200 transport.host: 10.0.2.39 transport.port: 9300 node.master: true node.data: true discovery.zen.ping.unicast.hosts: ["10.0.2.32:9300","10.0.2.39:9300"] discovery.zen.minimum_master_nodes: 2
But looking at the cluster state on either of the machines, it never shows two nodes.
I don't think that any important port is blocked. I can even use curl from one machine to look at the state on the other.
(Please don't tell me that the oss version does not support this )