I have deployed Kafka using Helm and Minikube. I need to build a producer in Scala for that broker IP-address and host are required. I have defined NodePort service to expose Kafka to the outside world. I set up broker as minkube-ip:service-node-port, however, I get connection exception. What is wrong with the configuration I defined? With a docker-compose file, the application works fine.
Error stack trace:
Exception in thread "main" org.apache.kafka.common.errors.SerializationException: Error serializing Avro message
Caused by: java.net.ConnectException: Connection refused (Connection refused)
Kafka configurations look like this:
val brokers = "192.168.99.100:32400"
val props = new Properties()
props.put("bootstrap.servers", brokers)
props.put("client.id", "AvroKafkaProducer")
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer")
props.put("value.serializer", "io.confluent.kafka.serializers.KafkaAvroSerializer")
props.put("schema.registry.url", "http://0.0.0.0:8081")
Kafka NodePort service definition where labels match Kafka pods labeled produced by Helm:
kind: Service
apiVersion: v1
metadata:
name: kafka-service
spec:
selector:
app: cp-kafka
release: my-confluent-oss
ports:
- protocol: TCP
targetPort: 9092
port: 32400
nodePort: 32400
type: NodePort
This is the list of all the created services:
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-confluent-oss-cp-kafka ClusterIP 10.96.241.37 <none> 9092/TCP 6h25m
my-confluent-oss-cp-kafka-connect ClusterIP 10.105.148.181 <none> 8083/TCP 6h25m
my-confluent-oss-cp-kafka-headless ClusterIP None <none> 9092/TCP 6h25m
my-confluent-oss-cp-kafka-rest ClusterIP 10.99.154.76 <none> 8082/TCP 6h25m
my-confluent-oss-cp-ksql-server ClusterIP 10.108.41.220 <none> 8088/TCP 6h25m
my-confluent-oss-cp-schema-registry ClusterIP 10.108.182.212 <none> 8081/TCP 6h25m
my-confluent-oss-cp-zookeeper ClusterIP 10.97.148.103 <none> 2181/TCP 6h25m
my-confluent-oss-cp-zookeeper-headless ClusterIP None <none> 2888/TCP,3888/TCP 6h25m
The error is from the deserialiser trying to connect to the Schema Registry
props.put("schema.registry.url", "http://0.0.0.0:8081")
should read
props.put("schema.registry.url", "http://<hostname of Schema Registry resolvable from Connect node>:8081")