Incrementally bounce the cluster nodes to open additional secured port(s).
A final incremental bounce to close the PLAINTEXT port.
The security implementation lets you configure different protocols for both broker-client and broker-broker communication. These must be enabled in separate bounces. A PLAINTEXT port must be left open throughout so brokers and/or clients can continue to communicate.
When performing an incremental bounce, take into consideration the recommendations for doing rolling restarts to avoid downtime for end users.
The final bounce secures the cluster by closing the PLAINTEXT port.
ZooKeeper can be secured independently of the Kafka cluster. The steps for doing this are covered in the ZooKeeper section.