Druid Cluster Configuration: How do nodes see each other?

Hello, I have been working on setting up a druid cluster. I have 4 machines. My strategy is one node (coordinator, historical, broker, overlord) per machine. I followed the Tutorial: The Druid Cluster documentation as a first step, but I don’t seem to understand how nodes are able to see each other. I would expect this to be configured somewhere, but the documentation hardly points it out.

Would appreciate your help.

Thanks,

Tim

The nodes find each other through zookeeper. That’s why they all have to have zookeeper configured in their common.runtime.properties.