Kubernetes（docker）在docker compose中访问Kafka

Question

docker-compose.yml

version: '3'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:6.0.0
    hostname: zookeeper
    container_name: zookeeper
    restart: unless-stopped
    ports:
      - "2181:2181"
    volumes: 
      - ./data/zoo/zk-data:/var/lib/zookeeper/data
      - ./data/zoo/zk-txn-logs:/var/lib/zookeeper/log
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  broker:
    image: confluentinc/cp-server:6.0.0
    hostname: broker
    container_name: broker
    restart: unless-stopped
    depends_on:
      - zookeeper
    volumes: 
      - ./data/kafka:/var/lib/kafka/data
    ports:
      - "9092:9092"
      - "9101:9101"
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092
      KAFKA_METRIC_REPORTERS: io.confluent.metrics.reporter.ConfluentMetricsReporter
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
      KAFKA_CONFLUENT_LICENSE_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_CONFLUENT_BALANCER_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
      KAFKA_JMX_PORT: 9101
      KAFKA_CONFLUENT_SCHEMA_REGISTRY_URL: http://schema-registry:8081
      CONFLUENT_METRICS_REPORTER_BOOTSTRAP_SERVERS: broker:29092
      CONFLUENT_METRICS_REPORTER_TOPIC_REPLICAS: 1
      CONFLUENT_METRICS_ENABLE: 'true'
      CONFLUENT_SUPPORT_CUSTOMER_ID: 'anonymous'

  schema-registry:
    image: confluentinc/cp-schema-registry:6.0.0
    hostname: schema-registry
    container_name: schema-registry
    restart: unless-stopped
    depends_on:
      - broker
    ports:
      - "8081:8081"
    environment:
      SCHEMA_REGISTRY_HOST_NAME: schema-registry
      SCHEMA_REGISTRY_KAFKASTORE_BOOTSTRAP_SERVERS: 'broker:29092'

dev.yml

apiVersion: v1
kind: Service
metadata:
  name: auth-server
  labels:
    app: auth-server
spec:
  type: LoadBalancer
  ports:
    - port: 8882
      protocol: TCP
      targetPort: 8882
      nodePort: 30080
  selector:
    app: auth-server
status:
  loadBalancer:
    ingress:
      - hostname: localhost
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-server
spec:
  selector:
      matchLabels:
        app: auth-server
  replicas: 1
  template:
    metadata:
      labels:
        app: auth-server
    spec:
      containers:
        - name: auth-server
          image: auth-server:latest
          imagePullPolicy: Never
          ports:
            - containerPort: 8080
          volumeMounts:
            - name: auth-server
              mountPath: "/config"
      volumes:
        - name: auth-server
          configMap:
            name: auth-server

我需要从我的 kubernetes cluser (docker) 上的应用程序连接到 docker-compose kafka。 我尝试在属性中更改 kafka url：http://localhost:9092、http://broker:9092 和 THIS 教程，但也不起作用。

在 docker ps 我看到：来自 kubernetes 的 kafka 和 auth-server。

谁能解释一下。我该怎么做？

Answer 1

由于我不知道你对本地 K8s 的口味，我只能推测。但这里的问题可能是 Kubernetes 和 docker compose 在不同的虚拟网络中运行它们的容器。

要创建连接，您必须做的是：

1. 在您的 compose 文件中公开 Kafka 端口，并将端口映射到主机：

   ports:
   - 9092:9092
   

2. 通过 docker0 接口的 IP 地址（通常为 172.17.0.1）从 Kubernetes 连接到它。