Kraft based clusters ports used

[palpandy]

Hello,

In ZooKeeper-based Kafka clusters, port 2181 is used by Kafka brokers to connect to ZooKeeper, while 2888 and 3888 are used for ZooKeeper peer-to-peer communication.

I would like to confirm the ports used in KRaft mode:

• What ports are used for controller-to-controller communication by default?

• What is the default port used for Kafka broker to KRaft controller communication? I believe it's 9090, but would appreciate confirmation.

Thank you.

[see-quick]

Hi @palpandy,

You can see it within our documentation. [1]

What ports are used for controller-to-controller communication by default? What is the default port used for Kafka broker to KRaft controller communication? I believe it's 9090, but would appreciate confirmation.

The internal control plane listener on port 9090 facilitates interbroker communication between Kafka controllers and broker-to-controller communication. Additionally, the Cluster Operator communicates with the controllers through the listener. This listener is not accessible to Kafka clients.

And also from the doc, one can see this nice figure:

[1] - https://strimzi.io/docs/operators/latest/deploying

[palpandy]

Thank you @see-quick for the quick reply . This helps.

[see-quick]

No problem, happy to help 👍