There are three important things here: first, our Zookeeper port is 2181. Zookeeper is great for centralized configuration and coordination; if you want to learn more, check out this Sean Mackrory post.
The second bit of important information is how long our retention period is. Right now, it’s set to 7 days, and that’s our default. Remember that messages in a Kafka topic don’t go away simply because some consumer somewhere accessed them; they stay in the log until we say they can go.
Finally, we have a set of listeners. For the sandbox, the only listener is on port 6667. We connect to listeners from our outside applications, so knowing those addresses and ports is vital.
This is still quick-start level stuff, but I’m building up to custom development, honest!