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Supported tags

• v3.5.0, v3.5, latest
• v3.4.1, v3.4
• v3.3.2, v3.3
• More Tags

What is Apache Kafka?

Apache Kafka is an open-source distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications.

• wikipedia.org/wiki/Apache_Kafka

More than 80% of all Fortune 100 companies trust, and use Kafka.

Why use this image

• Fully compatible with KRaft, say goodbye to ZooKeeper.
• Flexible use of environment variables for configuration.
• Easy to deploy.
• Provide helm chart, you can quickly deploy high-availability clusters on Kubernetes.

How to use this image

Docker Hub

Start a kafka server instance

Starting a Kafka instance is simple:

docker run -d --name kafka-server --network host sir5kong/kafka

Persisting your data

docker volume create kafka-data
docker run -d --name kafka-server \
  --network host \
  -v kafka-data:/opt/kafka/data \
  sir5kong/kafka

The default listener port of the broker is 9092

Custom listener port

docker volume create kafka-data
docker run -d --name kafka-server \
  --network host \
  -v kafka-data:/opt/kafka/data \
  --env KAFKA_CONTROLLER_LISTENER_PORT=29091 \
  --env KAFKA_BROKER_LISTENER_PORT=29092 \
  sir5kong/kafka

Using Docker Compose

version: "3"

volumes:
  kafka-data: {}

## bootstrap-server: ${KAFKA_HOST_IP_ADDR}:9092

services:
  kafka:
    image: sir5kong/kafka:v3.5
    restart: always
    network_mode: host
    volumes:
      - kafka-data:/opt/kafka/data
    environment:
      - KAFKA_HEAP_OPTS=-Xmx512m -Xms512m
      #- KAFKA_CONTROLLER_LISTENER_PORT=19091
      #- KAFKA_BROKER_LISTENER_PORT=9092

Environment Variables

Variable	Default	Description
KAFKA_CLUSTER_ID	Random	Cluster ID
KAFKA_BROKER_LISTENER_PORT	9092	broker listener port. This will not work if KAFKA_CFG_LISTENERS is configured
KAFKA_CONTROLLER_LISTENER_PORT	19091	controller listener port. This will not work if KAFKA_CFG_LISTENERS is configured
KAFKA_HEAP_OPTS	null	Kafka Java Heap size. For example -Xmx512m -Xms512m

Kafka Configurations

Any environment variable beginning with KAFKA_CFG_ will be mapped to its corresponding Apache Kafka key.

For example, use KAFKA_CFG_LISTENERS in order to set listeners or KAFKA_CFG_ADVERTISED_LISTENERS in order to configure advertised.listeners.

Variable examples:

Variable	Key
KAFKA_CFG_PROCESS_ROLES	process.roles
KAFKA_CFG_LISTENERS	listeners
KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP	listener.security.protocol.map
KAFKA_CFG_ADVERTISED_LISTENERS	advertised.listeners
KAFKA_CFG_CONTROLLER_QUORUM_VOTERS	controller.quorum.voters
KAFKA_CFG_LOG_RETENTION_HOURS	log.retention.hours

log.dir and log.dirs are locked, you cannot overwrite them

Using helm chart

Prerequisites

• Kubernetes 1.18+
• Helm 3.3+

Get Repository Info

helm repo add kafka-repo https://helm-charts.itboon.top/kafka
helm repo update kafka-repo

Deploy a single-node cluster

• Turn off persistent storage here, only demonstrate the deployment operation

helm upgrade --install kafka \
  --namespace kafka-demo \
  --create-namespace \
  --set broker.combinedMode.enabled="true" \
  --set broker.persistence.enabled="false" \
  kafka-repo/kafka

One broker and one controller cluster

helm upgrade --install kafka \
  --namespace kafka-demo \
  --create-namespace \
  --set broker.persistence.size="20Gi" \
  kafka-repo/kafka

Persistence storage is used by default.

Deploy a highly available cluster

helm upgrade --install kafka \
  --namespace kafka-demo \
  --create-namespace \
  --set controller.replicaCount="3" \
  --set broker.replicaCount="3" \
  --set broker.heapOpts="-Xms4096m -Xmx4096m" \
  --set broker.resources.requests.memory="8Gi" \
  --set broker.resources.limits.memory="16Gi" \
  kafka-repo/kafka

More values please refer to examples/values-production.yml

Kubernetes external access

Enable Kubernetes external cluster access to Kafka brokers.

helm upgrade --install kafka \
  --namespace kafka-demo \
  --create-namespace \
  --set broker.external.enabled="true" \
  --set broker.external.service.type="LoadBalancer" \
  --set broker.external.domainSuffix="kafka.example.com" \
  kafka-repo/kafka

Configure your DNS record to complete this deployment.