version: "3" # Docker Compose format version

services:
    kafka:
        image: apache/kafka:latest
        container_name: kafka-crash-test
        ports:
            - "9092:9092" # host:container
        environment:
            KAFKA_NODE_ID: 1 # node identifier in cluster
            KAFKA_PROCESS_ROLES: broker,controller # Combined broker + controller (KRaft mode, no Zookeeper)
            KAFKA_CONTROLLER_QUORUM_VOTERS: 1@kafka:9093 # Controller nodes for quorum (node_id@host:port)

            # Listener configuration
            KAFKA_LISTENERS: PLAINTEXT://:9092,CONTROLLER://:9093 # Ports Kafka listens on internally
            KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092 # Address advertised to clients
            KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT
            KAFKA_CONTROLLER_LISTENER_NAMES: CONTROLLER # Listener for controller communication

            KAFKA_LOG_DIRS: /var/lib/kafka/data # Directory for message data storage
        volumes:
            - ./kafka-data:/var/lib/kafka/data # Persist data across container restarts