Kafka Broker

The technical documentation of the kafka-broker microservice, which handles the communication between the microservices.

The Kafka broker in the United Manufacturing Hub is RedPanda, a Kafka-compatible event streaming platform. It’s used to store and process messages, in order to stream real-time data between the microservices.

How it works

RedPanda is a distributed system that is made up of a cluster of brokers, designed for maximum performance and reliability. It does not depend on external systems like ZooKeeper, as it’s shipped as a single binary.

Read more about RedPanda in the official documentation.

Kubernetes resources

  • StatefulSet: united-manufacturing-hub-kafka
  • Service:
    • Internal ClusterIP (headless): united-manufacturing-hub-kafka
    • External NodePort: united-manufacturing-hub-kafka-external at port 9094 for the Kafka API listener, port 9644 for the Admin API listener, port 8083 for the HTTP Proxy listener, and port 8081 for the Schema Registry listener.
  • ConfigMap: united-manufacturing-hub-kafka
  • Secret: united-manufacturing-hub-kafka-sts-lifecycle
  • PersistentVolumeClaim: datadir-united-manufacturing-hub-kafka-0


You shouldn’t need to configure the Kafka broker manually, as it’s configured automatically when the cluster is deployed. However, if you need to change the configuration, you can do it by editing the redpanda section of the Helm chart values file.

Environment variables

Environment variables
Variable nameDescriptionTypeAllowed valuesDefault
HOST_IPThe IP address of the host machine.stringAnyRandom IP
POD_IPThe IP address of the pod.stringAnyRandom IP
SERVICE_NAMEThe name of the service.stringAnyunited-manufacturing-hub-kafka