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Version: 3.0.0-alpha (Diátaxis)

Deploy Kafka in 5 minutes

This guide walks you step by step through deploying your first Kafka cluster on Hikube, from the YAML manifest to initial messaging tests.

Objectives​

By the end of this guide, you will have:

  • A Kafka cluster deployed and running on Hikube
  • 3 Kafka brokers and 3 ZooKeeper nodes for high availability
  • A topic ready to receive messages
  • Persistent storage for your Kafka and ZooKeeper data

Prerequisites​

Before you begin, make sure you have:

  • kubectl configured with your Hikube kubeconfig
  • Admin rights on your tenant
  • A dedicated namespace to host your Kafka cluster
  • kafkacat (or kcat) installed on your workstation (optional, for testing)

Step 1: Create the Kafka manifest​

Create a kafka.yaml file with the following configuration:

kafka.yaml
apiVersion: apps.cozystack.io/v1alpha1
kind: Kafka
metadata:
  name: example
spec:
  external: false
  kafka:
    replicas: 3
    resourcesPreset: small
    size: 10Gi
    storageClass: replicated
  zookeeper:
    replicas: 3
    resourcesPreset: small
    size: 5Gi
    storageClass: replicated
  topics:
    - name: my-topic
      partitions: 3
      replicas: 3
      config:
        retention.ms: "604800000"
        cleanup.policy: "delete"
tip

Kafka does not have authentication enabled by default on Hikube. For production use, it is recommended not to expose the cluster externally (external: false). See the API Reference for the full configuration.

Step 2: Deploy the Kafka cluster​

Apply the manifest and verify that the deployment starts:

# Apply the manifest
kubectl apply -f kafka.yaml

Check the cluster status (may take 2-3 minutes):

kubectl get kafka

Expected output:

NAME      READY   AGE     VERSION
example   True    2m      0.13.0

Step 3: Pod verification​

Verify that all pods are in Running state:

kubectl get pods | grep kafka

Expected output:

kafka-example-kafka-0        1/1     Running   0   2m
kafka-example-kafka-1        1/1     Running   0   2m
kafka-example-kafka-2        1/1     Running   0   2m
kafka-example-zookeeper-0    1/1     Running   0   2m
kafka-example-zookeeper-1    1/1     Running   0   2m
kafka-example-zookeeper-2    1/1     Running   0   2m

With kafka.replicas: 3 and zookeeper.replicas: 3, you get 6 pods:

PrefixRoleCount
kafka-example-kafka-*Kafka Brokers (receive, store, and distribute messages)3
kafka-example-zookeeper-*ZooKeeper (cluster coordination and leader election)3

Step 4: Retrieve credentials​

Kafka on Hikube does not have authentication enabled by default. Connections are made directly via the bootstrap service:

kubectl get svc | grep kafka

Expected output:

kafka-example-kafka-bootstrap    ClusterIP      10.96.xx.xx    <none>        9092/TCP    2m
kafka-example-kafka-brokers      ClusterIP      None           <none>        9092/TCP    2m
kafka-example-zookeeper-client   ClusterIP      10.96.xx.xx    <none>        2181/TCP    2m
note

The kafka-example-kafka-bootstrap service is the main entry point for Kafka clients.

Step 5: Connection and testing​

Port-forward the Kafka service​

kubectl port-forward svc/kafka-example-kafka-bootstrap 9092:9092 &

Publish and consume a message​

# Send a message to the topic
echo "Hello Hikube!" | kafkacat -b localhost:9092 -t my-topic -P

# Consume the message
kafkacat -b localhost:9092 -t my-topic -C -o beginning -e

Expected output:

Hello Hikube!
note

If you don't have kafkacat, you can install it with apt install kafkacat (Debian/Ubuntu) or brew install kcat (macOS).

Step 6: Quick troubleshooting​

Pods in CrashLoopBackOff​

# Check the logs of the failing broker
kubectl logs kafka-example-kafka-0

# Check the pod events
kubectl describe pod kafka-example-kafka-0

Common causes: insufficient memory (kafka.resources.memory too low), storage volume full.

Kafka not accessible​

# Check that the services exist
kubectl get svc | grep kafka

# Check the bootstrap service
kubectl describe svc kafka-example-kafka-bootstrap

Common causes: port-forward not active, wrong port in the connection string, service not ready.

ZooKeeper errors​

# Check ZooKeeper logs
kubectl logs kafka-example-zookeeper-0

# Check ZooKeeper pod status
kubectl get pods | grep zookeeper

Common causes: the ZooKeeper quorum requires an odd number of replicas (3 minimum recommended), insufficient disk space.

General diagnostic commands​

# Recent events in the namespace
kubectl get events --sort-by=.metadata.creationTimestamp

# Detailed Kafka cluster status
kubectl describe kafka example

Step 7: Cleanup​

To delete the test resources:

kubectl delete -f kafka.yaml
warning

This action deletes the Kafka cluster and all associated data. This operation is irreversible.

Summary​

You have deployed:

  • A Kafka cluster with 3 brokers distributed across different nodes
  • 3 ZooKeeper nodes for cluster coordination
  • A topic configured with 3 partitions and 3 replicas
  • Persistent storage for data durability

Next steps​

  • API Reference: Full configuration of all Kafka options
  • Overview: Detailed architecture and Kafka use cases on Hikube

Prochaines etapes

Voir aussi