[bitnami/kafka] health check fails when running in kraft

[justjooste]

Name and Version

bitnami/kafka:latest

What architecture are you using?

arm64

What steps will reproduce the bug?

Running on M1 Mac with Docker compose
docker-compose.yaml

version: "3.8"

networks:
  kafka-pipeline:
    driver: bridge

services:

  kafka:
    image: 'bitnami/kafka:latest'
    restart: always
    healthcheck:
      test: ["CMD-SHELL", "nc -z localhost 9092 || exit 1"]
      start_period: 10s
      interval: 5s
      timeout: 10s
      retries: 5
    networks:
      - kafka-pipeline
    ports:
      - '9092:9092'
      - '9093:9093'
    environment:
      - KAFKA_ENABLE_KRAFT=yes
      - KAFKA_CFG_NODE_ID=1
      - KAFKA_CFG_PROCESS_ROLES=broker,controller
      - KAFKA_CFG_CONTROLLER_LISTENER_NAMES=CONTROLLER
      - KAFKA_CFG_INTER_BROKER_LISTENER_NAME=PLAINTEXT
      - KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP=CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT
      - KAFKA_CFG_LISTENERS=PLAINTEXT://kafka:9092,CONTROLLER://kafka:9093
      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://kafka:9092
      - KAFKA_CFG_CONTROLLER_QUORUM_VOTERS=1@kafka:9093
      - ALLOW_PLAINTEXT_LISTENER=yes
      - KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true
      - BITNAMI_DEBUG=TRUE

  producer:
    build:
      context: ./Producer
      dockerfile: dockerfile
    container_name: python-producer
    depends_on: 
      kafka:
        condition: service_healthy
    ports:
      - 8001:8001
    networks:
      - kafka-pipeline
    environment:
      - KAFKA_TOPIC_NAME=topic
      - KAFKA_SERVER=kafka
      - KAFKA_PORT=9092

What is the expected behavior?

python producer to run when docker-compose health check dependency returns service_healthy

What do you see instead?

dependency failed to start: container kafka is unhealthy

Additional information

Does not appear that the health check runs at all
probably an issue with configuration?

[migruiz4]

Hi @justjooste,

The bitnami/kafka image does not have the netcat package installed. That is why the healthcheck will fail:

I have no name!@cc9e95cdd14d:/$ nc -z localhost 9092
bash: nc: command not found

In case it helps, maybe the following command helps you perform a healthcheck, although it is more complex than checking the port is open:

kafka-topics.sh --bootstrap-server kafka:9092 --topic hc --create --if-not-exists && kafka-topics
.sh --bootstrap-server kafka:9092 --topic hc --describe

[justjooste]

I have used something similar to the above command provided by @migruiz4 and the health check is now working as intended. Thanks!