docker-compose.yml

services:
  # PostgreSQL Database - Debezium's is configured for replication
  postgres:
    image: quay.io/debezium/example-postgres:latest
    container_name: transactions-postgres
    ports:
      - 5432:5432
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    volumes:
      - ./postgres-data:/var/lib/postgresql/data
      # - ./init.sql:/docker-entrypoint-initdb.d/init.sql
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

  # Zookeeper for Kafka coordination
  zookeeper:
    image: confluentinc/cp-zookeeper:7.3.2
    container_name: transactions-zookeeper
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    ports:
      - "2181:2181"

  # Kafka Broker
  kafka:
    image: confluentinc/cp-kafka:7.3.2
    container_name: transactions-kafka
    depends_on:
      - zookeeper
    ports:
      - "9092:9092"
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
    healthcheck:
      test:
        [
          "CMD",
          "kafka-topics",
          "--bootstrap-server",
          "localhost:9092",
          "--list",
        ]
      interval: 10s
      timeout: 5s
      retries: 5

  # Debezium Connect Service
  debezium:
    image: quay.io/debezium/connect:latest
    container_name: transactions-debezium-connect
    depends_on:
      postgres:
        condition: service_healthy
      kafka:
        condition: service_healthy
    ports:
      - "8083:8083"
    environment:
      - BOOTSTRAP_SERVERS=kafka:29092
      - GROUP_ID=1
      - CONFIG_STORAGE_TOPIC=debezium_configs
      - OFFSET_STORAGE_TOPIC=debezium_offsets
      - STATUS_STORAGE_TOPIC=debezium_statuses
      # Increase heap size and GC for better performance
      - KAFKA_HEAP_OPTS=-Xms512M -Xmx1G

  # Optional: Kafka UI for easier management
  kafka-ui:
    image: provectuslabs/kafka-ui:latest
    container_name: transactions-kafka-ui
    ports:
      - "8080:8080"
    environment:
      - KAFKA_CLUSTERS_0_NAME=local
      - KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS=kafka:29092
      - KAFKA_CLUSTERS_0_ZOOKEEPER=zookeeper:2181
    depends_on:
      - kafka
      - zookeeper

volumes:
  postgres-data:
    driver: local

# Network configuration to ensure services can communicate
networks:
  default:
    name: transactions-network