I have a single node Kafka broker running inside a pod on a single node kubernetes environment. I am using this image for kafka: https://hub.docker.com/r/wurstmeister/kafka

kafka version = 1.1.0

Kubernetes cluster is running inside a VM on a server. The VM has the following IP on the active interface ens32 - 192.168.3.102

Kafka.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  namespace: casb-deployment
  name: kafkaservice
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: kafkaservice
    spec:
      hostname: kafkaservice
      containers:
      - name: kafkaservice
        imagePullPolicy: IfNotPresent
        image: wurstmeister/kafka:1.1.0
        env:
         - name: KAFKA_BROKER_ID
           value: "1"
#         - name: KAFKA_ADVERTISED_HOST_NAME
#           value: "kafkaservice"
         - name: KAFKA_LISTENER_SECURITY_PROTOCOL_MAP
           value: "INTERNAL_PLAINTEXT:PLAINTEXT,EXTERNAL_PLAINTEXT:PLAINTEXT"
         - name: KAFKA_LISTENERS
           value: "INTERNAL_PLAINTEXT://0.0.0.0:9092,EXTERNAL_PLAINTEXT://0.0.0.0:9093"
         - name: KAFKA_ADVERTISED_LISTENERS
           value: "INTERNAL_PLAINTEXT://kafkaservice:9092,EXTERNAL_PLAINTEXT://192.168.3.102:9093"
         - name: KAFKA_INTER_BROKER_LISTENER_NAME
           value: "INTERNAL_PLAINTEXT"
         - name: KAFKA_CREATE_TOPICS
           value: "topic-1:100:1,topic-2:1:1"  
         - name: KAFKA_ZOOKEEPER_CONNECT
           value: "zookeeper:2181"
        ports: 
        - name: port9092
          containerPort: 9092
        - name: port9093
          containerPort: 9093
        volumeMounts:
        - mountPath: /kafka/kafka-logs-kafkaservice
          name: kafka-volume
      volumes:
      - name: kafka-volume
        hostPath:
          path: /home/volume/kafka-logs

---

apiVersion: v1
kind: Service
metadata:
  namespace: casb-deployment
  name: kafkaservice
  labels:
    app: kafkaservice
spec:
  selector:
    app: kafkaservice
  ports:
  - name: port9092
    port: 9092
    targetPort: 9092
    protocol: TCP

---

apiVersion: v1
kind: Service
metadata:
  namespace: casb-deployment
  name: kafkaservice-external
  labels:
    app: kafkaservice-external
spec:
  selector:
    app: kafkaservice
  ports:
  - name: port9093
    port: 9093
    protocol: TCP
    nodePort: 30035
  type: NodePort

I am able to ping the VM i.e. the kubernetes node from my local machine ping 192.168.3.102 and I am using nodePort to expose the service.

I can also telnet telnet 192.168.3.102 30035 and it gives:

Trying 192.168.3.102...
Connected to 192.168.3.102.
Escape character is '^]'.

I tried running kafka console consumer and producer from my local machine:

Consumer: bin/kafka-console-consumer.sh --bootstrap-server 192.168.3.102:30035 --topic topic-1 --from-beginning

Output:

[2019-09-25 12:30:40,716] WARN [Consumer clientId=consumer-1, groupId=console-consumer-20551] Connection to node 1 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)

Producer:

bin/kafka-console-producer.sh --broker-list 192.168.3.102:30035 --topic topic-1

Output:

[2019-09-25 12:32:07,958] WARN [Producer clientId=console-producer] Connection to node 1 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)

Netstat:

netstat -tulpn | grep 30035
tcp6       0      0 :::30035                :::*                    LISTEN      113545/kube-proxy

I tried running a python based consumer i.e kafka-python==1.4.2 it gave me the following logs:

[2019-09-25T12:15:39+0500] INFO kafka.client Bootstrapping cluster metadata from [('192.168.3.102', 30035, <AddressFamily.AF_INET: 2>)]
[2019-09-25T12:15:39+0500] INFO kafka.conn <BrokerConnection node_id=bootstrap host=192.168.3.102:30035 <connecting> [IPv4 ('192.168.3.102', 30035)]>: connecting to 192.168.3.102:30035 [('192.168.3.102', 30035) IPv4]
[2019-09-25T12:15:39+0500] INFO kafka.conn <BrokerConnection node_id=bootstrap host=192.168.3.102:30035 <connecting> [IPv4 ('192.168.3.102', 30035)]>: Connection complete.
[2019-09-25T12:15:39+0500] INFO kafka.client Bootstrap succeeded: found 1 brokers and 26 topics.
[2019-09-25T12:15:39+0500] INFO kafka.conn <BrokerConnection node_id=bootstrap host=192.168.3.102:30035 <connected> [IPv4 ('192.168.3.102', 30035)]>: Closing connection. 
[2019-09-25T12:15:39+0500] INFO kafka.conn <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]>: connecting to 192.168.3.102:9093 [('192.168.3.102', 9093) IPv4]
[2019-09-25T12:15:39+0500] INFO kafka.conn Probing node 1 broker version
[2019-09-25T12:15:39+0500] ERROR kafka.conn Connect attempt to <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]> returned error 111. Disconnecting.
[2019-09-25T12:15:39+0500] INFO kafka.conn <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]>: Closing connection. ConnectionError: 111 ECONNREFUSED
[2019-09-25T12:15:40+0500] INFO kafka.conn <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]>: connecting to 192.168.3.102:9093 [('192.168.3.102', 9093) IPv4]
[2019-09-25T12:15:40+0500] ERROR kafka.conn Connect attempt to <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]> returned error 111. Disconnecting.
[2019-09-25T12:15:40+0500] INFO kafka.conn <BrokerConnection node_id=1 host=192.168.3.102:9093 <connecting> [IPv4 ('192.168.3.102', 9093)]>: Closing connection. ConnectionError: 111 ECONNREFUSED
[2019-09-25T12:15:40+0500] INFO Activity URL collector Exception in activity url collector: NoBrokersAvailable

From the logs it seems like the connection was made i.e.

<connecting> [IPv4 ('192.168.3.102', 30035)]>: Connection complete.
Bootstrap succeeded: found 1 brokers and 26 topics.

But then it got disconnected.

Please help me out in figuring out what am I missing and how can I resolve this. Thanks.