config/server.properties

# Broker.id is generated based on the kubernetes hostname suffix (kafka-N)
# Advertised listener client is based on the node's hostname: server0
# A Kubernetes NodePort service exposes the node's port (30092) to allow traffic from outside of the Kubernetes cluster

broker.id=0
listener.security.protocol.map=CLIENT:PLAINTEXT,REPLICATION:PLAINTEXT,INTERNAL_PLAINTEXT:PLAINTEXT,INTERNAL_SASL:PLAINTEXT
advertised.listeners=CLIENT://server0:30092,REPLICATION://kafka-0.kafka-broker.kafka.svc.cluster.local:30093,INTERNAL_PLAINTEXT://kafka-0.kafka-broker.kafka.svc.cluster.local:30094,INTERNAL_SASL://kafka-0.kafka-broker.kafka.svc.cluster.local:30095
listeners=CLIENT://0.0.0.0:30092,REPLICATION://0.0.0.0:30093,INTERNAL_PLAINTEXT://172.31.100.3:30094,INTERNAL_SASL://172.31.100.3:30095
inter.broker.listener.name=REPLICATION

zookeeper.connect=zookeeper-headless.zookeeper.svc.cluster.local:2181/kafka
zookeeper.connection.timeout.ms=6000

auto.create.topics.enable=true
delete.topic.enable=true
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
log.dirs=/opt/kafka/data/topics
num.partitions=1
num.recovery.threads.per.data.dir=1
log.retention.hours=-1
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
default.replication.factor=3