我使用dockerinspect命令启动了一个kafka（版本2.2.0）docker容器。
Kafka配置是

Using ZOOKEEPER_CONNECT=172.17.0.2:2181
Using KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://172.17.0.6:9092
Using KAFKA_BROKER=172.17.0.4:9092

显示网络设置

"NetworkSettings": {
            "Ports": {
                "8778/tcp": null,
                "9092/tcp": null,
                "9779/tcp": null
            },
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.6",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:06"

我还查阅了Kafka容器中的主题。

./zkCli.sh
ls /brokers/topics

主题如下所示

[connect-status, dbserver1.public.dumb_table, my-connect-offsets, __consumer_offsets, my-connect-configs]

最后我启动了一个节点应用程序来连接Kafka，但失败了(https://github.com/sohu-co/kafka-node#kafkaclient)

const kafka = require('kafka-node');
const bp = require('body-parser');

try {
  const Consumer = kafka.HighLevelConsumer;
  const client = new kafka.KafkaClient({kafkaHost: '172.17.0.6:9092'});
  let consumer = new kafka.Consumer(
    client,
    [{ topic: "dbserver1.public.dumb_table", partition: 0 }],
    {
      autoCommit: true,
      fetchMaxWaitMs: 1000,
      fetchMaxBytes: 1024 * 1024,
      encoding: 'utf8',
      fromOffset: false
    }
  );
  consumer.on('ready', function () {
        console.log('consumer ready');

  });
  consumer.on('message', async function(message) {
    console.log('here');
    console.log(
      'kafka-> ',
      message.value
    );
  })
  consumer.on('error', function(err) {
    console.log('error', err);
  });
}
catch(e) {
  console.log(e);
}

如果kafkahost配置为“172.17.0.6:9092”，则抛出一个错误

{ Error: connect ENETUNREACH 172.17.0.6:9092
    at Object._errnoException (util.js:992:11)
    at _exceptionWithHostPort (util.js:1014:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
  code: 'ENETUNREACH',
  errno: 'ENETUNREACH',
  syscall: 'connect',
  address: '172.17.0.6',
  port: 9092 }

如果kafkahost配置为'localhost:9092，将抛出一个错误

{ TimeoutError: Request timed out after 30000ms
at new TimeoutError (/Users/xisizhe/Documents/projects/game/server/node_modules/kafka-node/lib/errors/TimeoutError.js:6:9)
at Timeout.setTimeout [as _onTimeout] (/Users/xisizhe/Documents/projects/game/server/node_modules/kafka-node/lib/kafkaClient.js:491:14)
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5) message: 'Request timed out after 30000ms' }