从k8s中的另一个名称空间连接到kafka

我的minikube中的kafka和zookeeper具有以下配置:

apiVersion: v1
kind: Service
metadata:
  name: kafka-service
  namespace: kafka
spec:
  selector:
    app: kafka
  ports:
    - protocol: TCP
      port: 9092
      name: kafka-port
    - protocol: TCP
      port: 9094
      name: kafka-port-out
    - protocol: TCP
      port: 2181
      name: kafka-zk
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kafka-deployment
  namespace: kafka
spec:
  replicas: 1
  selector:
    matchLabels:
      app: kafka
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        app: kafka
        k8s-app: kube-dns
    spec:
      containers:
        - name: kafka-container
          image: bitnami/kafka:latest
          env:
          - name: 'ALLOW_PLAINTEXT_LISTENER'
            value: 'yes'
          - name: 'KAFKA_CFG_ZOOKEEPER_CONNECT'
            value: 'zookeeper-service:2181'
          - name: 'KAFKA_CFG_LISTENERS'
            value: 'PLAINTEXT://:9092'
          - name: 'KAFKA_CFG_ADVERTISED_LISTENERS' # if I comment this and the next line it works only locally
            value: 'PLAINTEXT://kafka-service.kafka:9092'
          ports:
            - containerPort: 9092
              name: kafka-port
            - containerPort: 9094
              name: kafka-port-out
            - containerPort: 5555
              name: kafka-port-jmx
            - containerPort: 2181
              name: kafka-zk

这是我的zookeeper的配置:

apiVersion: v1
kind: Service
metadata:
  name: zookeeper-service
  namespace: kafka
spec:
  selector:
    app: zookeeper
  ports:
    - protocol: TCP
      port: 2181
      name: zookeeper-port
    - protocol: TCP
      port: 2888
      name: zookeeper-peer
    - protocol: TCP
      port: 3888
      name: leader-election
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zookeeper-deployment
  namespace: kafka
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zookeeper
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        app: zookeeper
        k8s-app: kube-dns
    spec:
      containers:
        - name: zookeeper-container
          image: bitnami/zookeeper:latest
          env:
            - name: 'ALLOW_ANONYMOUS_LOGIN'
              value: 'yes'
            - name: 'ZOOKEEPER_ID'
              value: '1'
          ports:
            - containerPort: 2181
              name: zookeeper-port
            - containerPort: 2888
              name: zookeeper-peer
            - containerPort: 3888
              name: leader-election

我还有另一个部署:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: kafkacat-deployment
#  namespace: debug # I was using it from another namespace, but it was not working so I've tried to use the same
  namespace: kafka
spec:
  replicas: 1
  selector:
    matchLabels:
      app: kafkacat
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        app: kafkacat
        k8s-app: kube-dns
    spec:
      containers:
      - name: kafkacat-container
        image: edenhill/kafkacat:1.5.0

然后,我尝试通过Telnet进行连接,并且可以正常工作。

# telnet kafka-service.kafka 9092
Trying 10.107.48.157...
Connected to kafka-service.kafka.svc.cluster.local.
Escape character is '^]'.

但是当我尝试达到它时,我得到的是:

kafkacat -b kafka-service.kafka:9092 -L
% ERROR: Failed to acquire metadata: Local: Timed out

So my guess it that the problem is in the Kafka configuration: If I comment the env var KAFKA_CFG_ADVERTISED_LISTENERS it it works like that:

# kafkacat -b kafka-service.kafka:9092 -L
Metadata for all topics (from broker -1: kafka-service.kafka:9092/bootstrap):
 1 brokers:
  broker 1001 at kafka-deployment-858c5c7f98-tt7sr:9092
 2 topics:
  topic "my_topic" with 1 partitions:
    partition 0, leader 1001, replicas: 1001, isrs: 1001
  topic "__consumer_offsets" with 50 partitions:
    partition 0, leader 1001, replicas: 1001, isrs: 1001

如果我尝试产生一条消息:

kafkacat -b kafka-service.kafka:9092 -P -t my_topic
oi
% ERROR: Local: Host resolution failure: kafka-deployment-858c5c7f98-w2dm5:9092/1001: Failed to resolve 'kafka-deployment-858c5c7f98-w2dm5:9092': Temporary failure in name resolution (after 15382734ms in state INIT)

然后,如果我尝试食用:

kafkacat -b kafka-service.kafka:9092 -C -t my_topic
% ERROR: Local: Host resolution failure: kafka-deployment-858c5c7f98-w2dm5:9092/1001: Failed to resolve 'kafka-deployment-858c5c7f98-w2dm5:9092': Temporary failure in name resolution (after 15406287ms in state INIT)

I have tried to configure the KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://kafka-service.kafka.svc.cluster.local:9092 but I still get timeout when I try to get the information with kafkacat.

这就是为什么播发的侦听器是无法从本地计算机访问的主机名的原因。 如何解决群集中的Kafka配置?

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