apache-kafka - 一旦进入 Kubernetes/Minikube，Kafka 就无法访问

Question

我需要在本地 Kubernetes 实例(使用 Minikube)中运行 Kafka，并使 Minikube VM 之外的客户端应用程序(发布者和订阅者)可以访问生成的 Kafka 服务。

我已经在 Minikube 中启动并运行了所有东西，但我想我犯了一个配置错误，因为我无法从外部访问 Kafka。我已经阅读了类似的问题并尝试了建议的解决方案，但没有一个为我解决了问题。

我已经在 https://github.com/thomasleplus/docker-kafka 发布了我的 YAML 配置文件以及我用来在我的 Ubuntu 机器上启动整个过程的 shell 脚本。如果有人能帮我发现我错过了什么，我将不胜感激。

到目前为止，这是我的配置:

$ kubectl describe service kafka-service
Name:           kafka-service
Namespace:      default
Labels:         run=kafka
Annotations:        <none>
Selector:       run=kafka
Type:           NodePort
IP:         10.0.0.121
Port:           kafka-port  30123/TCP
NodePort:       kafka-port  30123/TCP
Endpoints:      172.17.0.3:9092
Session Affinity:   None
Events:         <none>

$ kubectl describe deployment kafka-deployment
Name:           kafka-deployment
Namespace:      default
CreationTimestamp:  Thu, 17 Aug 2017 20:42:51 -0700
Labels:         run=kafka
Annotations:        deployment.kubernetes.io/revision=1
Selector:       run=kafka
Replicas:       1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:       RollingUpdate
MinReadySeconds:    0
RollingUpdateStrategy:  1 max unavailable, 1 max surge
Pod Template:
  Labels:   run=kafka
  Containers:
   kafka-service:
    Image:  wurstmeister/kafka
    Port:   9092/TCP
    Environment:
      KAFKA_ADVERTISED_HOST_NAME:   192.168.99.100
      KAFKA_ADVERTISED_PORT:        30123
      KAFKA_BROKER_ID:          1
      KAFKA_ZOOKEEPER_CONNECT:      zookeeper-service:2181
    Mounts:             <none>
  Volumes:              <none>
Conditions:
  Type      Status  Reason
  ----      ------  ------
  Available     True    MinimumReplicasAvailable
OldReplicaSets: <none>
NewReplicaSet:  kafka-deployment-2817439001 (1/1 replicas created)
Events:
  FirstSeen LastSeen    Count   From            SubObjectPath   Type        Reason          Message
  --------- --------    -----   ----            -------------   --------    ------          -------
  15m       15m     1   deployment-controller           Normal      ScalingReplicaSet   Scaled up replica set kafka-deployment-2817439001 to 1

日志:

waiting for kafka to be ready
[2017-08-18 04:31:00,296] INFO KafkaConfig values: 
    advertised.host.name = null
    advertised.listeners = PLAINTEXT://192.168.99.100:30123
    advertised.port = null
    alter.config.policy.class.name = null
    authorizer.class.name = 
    auto.create.topics.enable = true
    auto.leader.rebalance.enable = true
    background.threads = 10
    broker.id = 1
    broker.id.generation.enable = true
    broker.rack = null
    compression.type = producer
    connections.max.idle.ms = 600000
    controlled.shutdown.enable = true
    controlled.shutdown.max.retries = 3
    controlled.shutdown.retry.backoff.ms = 5000
    controller.socket.timeout.ms = 30000
    create.topic.policy.class.name = null
    default.replication.factor = 1
    delete.records.purgatory.purge.interval.requests = 1
    delete.topic.enable = false
    fetch.purgatory.purge.interval.requests = 1000
    group.initial.rebalance.delay.ms = 0
    group.max.session.timeout.ms = 300000
    group.min.session.timeout.ms = 6000
    host.name = 
    inter.broker.listener.name = null
    inter.broker.protocol.version = 0.11.0-IV2
    leader.imbalance.check.interval.seconds = 300
    leader.imbalance.per.broker.percentage = 10
    listener.security.protocol.map = SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,TRACE:TRACE,SASL_SSL:SASL_SSL,PLAINTEXT:PLAINTEXT
    listeners = PLAINTEXT://:9092
    log.cleaner.backoff.ms = 15000
    log.cleaner.dedupe.buffer.size = 134217728
    log.cleaner.delete.retention.ms = 86400000
    log.cleaner.enable = true
    log.cleaner.io.buffer.load.factor = 0.9
    log.cleaner.io.buffer.size = 524288
    log.cleaner.io.max.bytes.per.second = 1.7976931348623157E308
    log.cleaner.min.cleanable.ratio = 0.5
    log.cleaner.min.compaction.lag.ms = 0
    log.cleaner.threads = 1
    log.cleanup.policy = [delete]
    log.dir = /tmp/kafka-logs
    log.dirs = /kafka/kafka-logs-kafka-deployment-2817439001-tqbjq
    log.flush.interval.messages = 9223372036854775807
    log.flush.interval.ms = null
    log.flush.offset.checkpoint.interval.ms = 60000
    log.flush.scheduler.interval.ms = 9223372036854775807
    log.flush.start.offset.checkpoint.interval.ms = 60000
    log.index.interval.bytes = 4096
    log.index.size.max.bytes = 10485760
    log.message.format.version = 0.11.0-IV2
    log.message.timestamp.difference.max.ms = 9223372036854775807
    log.message.timestamp.type = CreateTime
    log.preallocate = false
    log.retention.bytes = -1
    log.retention.check.interval.ms = 300000
    log.retention.hours = 168
    log.retention.minutes = null
    log.retention.ms = null
    log.roll.hours = 168
    log.roll.jitter.hours = 0
    log.roll.jitter.ms = null
    log.roll.ms = null
    log.segment.bytes = 1073741824
    log.segment.delete.delay.ms = 60000
    max.connections.per.ip = 2147483647
    max.connections.per.ip.overrides = 
    message.max.bytes = 1000012
    metric.reporters = []
    metrics.num.samples = 2
    metrics.recording.level = INFO
    metrics.sample.window.ms = 30000
    min.insync.replicas = 1
    num.io.threads = 8
    num.network.threads = 3
    num.partitions = 1
    num.recovery.threads.per.data.dir = 1
    num.replica.fetchers = 1
    offset.metadata.max.bytes = 4096
    offsets.commit.required.acks = -1
    offsets.commit.timeout.ms = 5000
    offsets.load.buffer.size = 5242880
    offsets.retention.check.interval.ms = 600000
    offsets.retention.minutes = 1440
    offsets.topic.compression.codec = 0
    offsets.topic.num.partitions = 50
    offsets.topic.replication.factor = 1
    offsets.topic.segment.bytes = 104857600
    port = 9092
    principal.builder.class = class org.apache.kafka.common.security.auth.DefaultPrincipalBuilder
    producer.purgatory.purge.interval.requests = 1000
    queued.max.requests = 500
    quota.consumer.default = 9223372036854775807
    quota.producer.default = 9223372036854775807
    quota.window.num = 11
    quota.window.size.seconds = 1
    replica.fetch.backoff.ms = 1000
    replica.fetch.max.bytes = 1048576
    replica.fetch.min.bytes = 1
    replica.fetch.response.max.bytes = 10485760
    replica.fetch.wait.max.ms = 500
    replica.high.watermark.checkpoint.interval.ms = 5000
    replica.lag.time.max.ms = 10000
    replica.socket.receive.buffer.bytes = 65536
    replica.socket.timeout.ms = 30000
    replication.quota.window.num = 11
    replication.quota.window.size.seconds = 1
    request.timeout.ms = 30000
    reserved.broker.max.id = 1000
    sasl.enabled.mechanisms = [GSSAPI]
    sasl.kerberos.kinit.cmd = /usr/bin/kinit
    sasl.kerberos.min.time.before.relogin = 60000
    sasl.kerberos.principal.to.local.rules = [DEFAULT]
    sasl.kerberos.service.name = null
    sasl.kerberos.ticket.renew.jitter = 0.05
    sasl.kerberos.ticket.renew.window.factor = 0.8
    sasl.mechanism.inter.broker.protocol = GSSAPI
    security.inter.broker.protocol = PLAINTEXT
    socket.receive.buffer.bytes = 102400
    socket.request.max.bytes = 104857600
    socket.send.buffer.bytes = 102400
    ssl.cipher.suites = null
    ssl.client.auth = none
    ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
    ssl.endpoint.identification.algorithm = null
    ssl.key.password = null
    ssl.keymanager.algorithm = SunX509
    ssl.keystore.location = null
    ssl.keystore.password = null
    ssl.keystore.type = JKS
    ssl.protocol = TLS
    ssl.provider = null
    ssl.secure.random.implementation = null
    ssl.trustmanager.algorithm = PKIX
    ssl.truststore.location = null
    ssl.truststore.password = null
    ssl.truststore.type = JKS
    transaction.abort.timed.out.transaction.cleanup.interval.ms = 60000
    transaction.max.timeout.ms = 900000
    transaction.remove.expired.transaction.cleanup.interval.ms = 3600000
    transaction.state.log.load.buffer.size = 5242880
    transaction.state.log.min.isr = 1
    transaction.state.log.num.partitions = 50
    transaction.state.log.replication.factor = 1
    transaction.state.log.segment.bytes = 104857600
    transactional.id.expiration.ms = 604800000
    unclean.leader.election.enable = false
    zookeeper.connect = zookeeper-service:2181
    zookeeper.connection.timeout.ms = 6000
    zookeeper.session.timeout.ms = 6000
    zookeeper.set.acl = false
    zookeeper.sync.time.ms = 2000
 (kafka.server.KafkaConfig)
[2017-08-18 04:31:00,436] INFO starting (kafka.server.KafkaServer)
[2017-08-18 04:31:00,439] INFO Connecting to zookeeper on zookeeper-service:2181 (kafka.server.KafkaServer)
[2017-08-18 04:31:00,467] INFO Starting ZkClient event thread. (org.I0Itec.zkclient.ZkEventThread)
[2017-08-18 04:31:00,472] INFO Client environment:zookeeper.version=3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,472] INFO Client environment:host.name=kafka-deployment-2817439001-tqbjq (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.version=1.8.0_131 (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.vendor=Oracle Corporation (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.home=/opt/jdk1.8.0_131/jre (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.class.path=:/opt/kafka/bin/../libs/aopalliance-repackaged-2.5.0-b05.jar:/opt/kafka/bin/../libs/argparse4j-0.7.0.jar:/opt/kafka/bin/../libs/commons-lang3-3.5.jar:/opt/kafka/bin/../libs/connect-api-0.11.0.0.jar:/opt/kafka/bin/../libs/connect-file-0.11.0.0.jar:/opt/kafka/bin/../libs/connect-json-0.11.0.0.jar:/opt/kafka/bin/../libs/connect-runtime-0.11.0.0.jar:/opt/kafka/bin/../libs/connect-transforms-0.11.0.0.jar:/opt/kafka/bin/../libs/guava-20.0.jar:/opt/kafka/bin/../libs/hk2-api-2.5.0-b05.jar:/opt/kafka/bin/../libs/hk2-locator-2.5.0-b05.jar:/opt/kafka/bin/../libs/hk2-utils-2.5.0-b05.jar:/opt/kafka/bin/../libs/jackson-annotations-2.8.5.jar:/opt/kafka/bin/../libs/jackson-core-2.8.5.jar:/opt/kafka/bin/../libs/jackson-databind-2.8.5.jar:/opt/kafka/bin/../libs/jackson-jaxrs-base-2.8.5.jar:/opt/kafka/bin/../libs/jackson-jaxrs-json-provider-2.8.5.jar:/opt/kafka/bin/../libs/jackson-module-jaxb-annotations-2.8.5.jar:/opt/kafka/bin/../libs/javassist-3.21.0-GA.jar:/opt/kafka/bin/../libs/javax.annotation-api-1.2.jar:/opt/kafka/bin/../libs/javax.inject-1.jar:/opt/kafka/bin/../libs/javax.inject-2.5.0-b05.jar:/opt/kafka/bin/../libs/javax.servlet-api-3.1.0.jar:/opt/kafka/bin/../libs/javax.ws.rs-api-2.0.1.jar:/opt/kafka/bin/../libs/jersey-client-2.24.jar:/opt/kafka/bin/../libs/jersey-common-2.24.jar:/opt/kafka/bin/../libs/jersey-container-servlet-2.24.jar:/opt/kafka/bin/../libs/jersey-container-servlet-core-2.24.jar:/opt/kafka/bin/../libs/jersey-guava-2.24.jar:/opt/kafka/bin/../libs/jersey-media-jaxb-2.24.jar:/opt/kafka/bin/../libs/jersey-server-2.24.jar:/opt/kafka/bin/../libs/jetty-continuation-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-http-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-io-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-security-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-server-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-servlet-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-servlets-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jetty-util-9.2.15.v20160210.jar:/opt/kafka/bin/../libs/jopt-simple-5.0.3.jar:/opt/kafka/bin/../libs/kafka-clients-0.11.0.0.jar:/opt/kafka/bin/../libs/kafka-log4j-appender-0.11.0.0.jar:/opt/kafka/bin/../libs/kafka-streams-0.11.0.0.jar:/opt/kafka/bin/../libs/kafka-streams-examples-0.11.0.0.jar:/opt/kafka/bin/../libs/kafka-tools-0.11.0.0.jar:/opt/kafka/bin/../libs/kafka_2.12-0.11.0.0-sources.jar:/opt/kafka/bin/../libs/kafka_2.12-0.11.0.0-test-sources.jar:/opt/kafka/bin/../libs/kafka_2.12-0.11.0.0.jar:/opt/kafka/bin/../libs/log4j-1.2.17.jar:/opt/kafka/bin/../libs/lz4-1.3.0.jar:/opt/kafka/bin/../libs/maven-artifact-3.5.0.jar:/opt/kafka/bin/../libs/metrics-core-2.2.0.jar:/opt/kafka/bin/../libs/osgi-resource-locator-1.0.1.jar:/opt/kafka/bin/../libs/plexus-utils-3.0.24.jar:/opt/kafka/bin/../libs/reflections-0.9.11.jar:/opt/kafka/bin/../libs/rocksdbjni-5.0.1.jar:/opt/kafka/bin/../libs/scala-library-2.12.2.jar:/opt/kafka/bin/../libs/scala-parser-combinators_2.12-1.0.4.jar:/opt/kafka/bin/../libs/slf4j-api-1.7.25.jar:/opt/kafka/bin/../libs/slf4j-log4j12-1.7.25.jar:/opt/kafka/bin/../libs/snappy-java-1.1.2.6.jar:/opt/kafka/bin/../libs/validation-api-1.1.0.Final.jar:/opt/kafka/bin/../libs/zkclient-0.10.jar:/opt/kafka/bin/../libs/zookeeper-3.4.10.jar (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.io.tmpdir=/tmp (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:java.compiler=<NA> (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:os.name=Linux (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,473] INFO Client environment:os.arch=amd64 (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,474] INFO Client environment:os.version=4.9.13 (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,474] INFO Client environment:user.name=root (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,474] INFO Client environment:user.home=/root (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,474] INFO Client environment:user.dir=/ (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,475] INFO Initiating client connection, connectString=zookeeper-service:2181 sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@6d2a209c (org.apache.zookeeper.ZooKeeper)
[2017-08-18 04:31:00,500] INFO Waiting for keeper state SyncConnected (org.I0Itec.zkclient.ZkClient)
[2017-08-18 04:31:00,505] INFO Opening socket connection to server zookeeper-service.default.svc.cluster.local/10.0.0.56:2181. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn)
[2017-08-18 04:31:00,516] INFO Socket connection established to zookeeper-service.default.svc.cluster.local/10.0.0.56:2181, initiating session (org.apache.zookeeper.ClientCnxn)
[2017-08-18 04:31:00,558] INFO Session establishment complete on server zookeeper-service.default.svc.cluster.local/10.0.0.56:2181, sessionid = 0x15df39b70410000, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn)
[2017-08-18 04:31:00,560] INFO zookeeper state changed (SyncConnected) (org.I0Itec.zkclient.ZkClient)
[2017-08-18 04:31:00,682] INFO Cluster ID = V2Mj7cI3SMG_VoQxmtb9Tw (kafka.server.KafkaServer)
[2017-08-18 04:31:00,685] WARN No meta.properties file under dir /kafka/kafka-logs-kafka-deployment-2817439001-tqbjq/meta.properties (kafka.server.BrokerMetadataCheckpoint)
[2017-08-18 04:31:00,727] INFO [ThrottledRequestReaper-Fetch]: Starting (kafka.server.ClientQuotaManager$ThrottledRequestReaper)
[2017-08-18 04:31:00,727] INFO [ThrottledRequestReaper-Produce]: Starting (kafka.server.ClientQuotaManager$ThrottledRequestReaper)
[2017-08-18 04:31:00,728] INFO [ThrottledRequestReaper-Request]: Starting (kafka.server.ClientQuotaManager$ThrottledRequestReaper)
[2017-08-18 04:31:00,801] INFO Log directory '/kafka/kafka-logs-kafka-deployment-2817439001-tqbjq' not found, creating it. (kafka.log.LogManager)
[2017-08-18 04:31:00,810] INFO Loading logs. (kafka.log.LogManager)
[2017-08-18 04:31:00,819] INFO Logs loading complete in 9 ms. (kafka.log.LogManager)
[2017-08-18 04:31:00,891] INFO Starting log cleanup with a period of 300000 ms. (kafka.log.LogManager)
[2017-08-18 04:31:00,899] INFO Starting log flusher with a default period of 9223372036854775807 ms. (kafka.log.LogManager)
[2017-08-18 04:31:00,960] INFO Awaiting socket connections on 0.0.0.0:9092. (kafka.network.Acceptor)
[2017-08-18 04:31:00,965] INFO [Socket Server on Broker 1], Started 1 acceptor threads (kafka.network.SocketServer)
[2017-08-18 04:31:00,982] INFO [ExpirationReaper-1-Produce]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:00,985] INFO [ExpirationReaper-1-Fetch]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:00,989] INFO [ExpirationReaper-1-DeleteRecords]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:01,089] INFO [ExpirationReaper-1-topic]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:01,090] INFO Creating /controller (is it secure? false) (kafka.utils.ZKCheckedEphemeral)
[2017-08-18 04:31:01,101] INFO Result of znode creation is: OK (kafka.utils.ZKCheckedEphemeral)
[2017-08-18 04:31:01,101] INFO [ExpirationReaper-1-Heartbeat]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:01,128] INFO [ExpirationReaper-1-Rebalance]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-08-18 04:31:01,164] INFO [GroupCoordinator 1]: Starting up. (kafka.coordinator.group.GroupCoordinator)
[2017-08-18 04:31:01,170] INFO [GroupCoordinator 1]: Startup complete. (kafka.coordinator.group.GroupCoordinator)
[2017-08-18 04:31:01,178] INFO [Group Metadata Manager on Broker 1]: Removed 0 expired offsets in 11 milliseconds. (kafka.coordinator.group.GroupMetadataManager)
[2017-08-18 04:31:01,200] INFO [ProducerId Manager 1]: Acquired new producerId block (brokerId:1,blockStartProducerId:0,blockEndProducerId:999) by writing to Zk with path version 1 (kafka.coordinator.transaction.ProducerIdManager)
[2017-08-18 04:31:01,259] INFO [Transaction Coordinator 1]: Starting up. (kafka.coordinator.transaction.TransactionCoordinator)
[2017-08-18 04:31:01,277] INFO [Transaction Coordinator 1]: Startup complete. (kafka.coordinator.transaction.TransactionCoordinator)
[2017-08-18 04:31:01,277] INFO [Transaction Marker Channel Manager 1]: Starting (kafka.coordinator.transaction.TransactionMarkerChannelManager)
[2017-08-18 04:31:01,335] INFO Will not load MX4J, mx4j-tools.jar is not in the classpath (kafka.utils.Mx4jLoader$)
[2017-08-18 04:31:01,374] INFO Creating /brokers/ids/1 (is it secure? false) (kafka.utils.ZKCheckedEphemeral)
[2017-08-18 04:31:01,378] INFO Result of znode creation is: OK (kafka.utils.ZKCheckedEphemeral)
[2017-08-18 04:31:01,381] INFO Registered broker 1 at path /brokers/ids/1 with addresses: EndPoint(192.168.99.100,30123,ListenerName(PLAINTEXT),PLAINTEXT) (kafka.utils.ZkUtils)
[2017-08-18 04:31:01,383] WARN No meta.properties file under dir /kafka/kafka-logs-kafka-deployment-2817439001-tqbjq/meta.properties (kafka.server.BrokerMetadataCheckpoint)
[2017-08-18 04:31:01,394] INFO Kafka version : 0.11.0.0 (org.apache.kafka.common.utils.AppInfoParser)
[2017-08-18 04:31:01,394] INFO Kafka commitId : cb8625948210849f (org.apache.kafka.common.utils.AppInfoParser)
[2017-08-18 04:31:01,395] INFO [Kafka Server 1], started (kafka.server.KafkaServer)
[2017-08-18 04:41:01,167] INFO [Group Metadata Manager on Broker 1]: Removed 0 expired offsets in 0 milliseconds. (kafka.coordinator.group.GroupMetadataManager)

大多数类似问题的答案都建议像我一样使用服务类型 NodePort。并使用 port/targetPort/nodePort 将 Kafka 的默认 9092 端口映射到一个可公开的端口(我选择了 30123)。

$ minikube service kafka-service --url
http://192.168.99.100:30123

$ nmap 192.168.99.100 -p 30123

Starting Nmap 7.40 ( https://nmap.org ) at 2017-08-17 20:43 PDT
Nmap scan report for 192.168.99.100
Host is up (0.00036s latency).
PORT      STATE SERVICE
30123/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 13.06 seconds

最后，看起来 192.168.99.100:30123 应该是从 Minikube 外部访问 Kafka 的方式(这就是我在 KAFKA_ADVERTISED_HOST_NAME 和 KAFKA_ADVERTISED_PORT 中放置的内容)但客户端无法使用这些连接:

$ kafkacat -C -b 192.168.99.100:30123 -t demo
% ERROR: Topic demo error: Broker: Leader not available

最后，一些答案提到了潜在的防火墙干扰，所以我尝试禁用我机器的防火墙，但它没有改变任何东西。如果我需要禁用 Minikube VM 内的防火墙，我不知道该怎么做。

任何帮助将不胜感激。

Answer 1

问题与最新版本的 minikube 中的错误有关(请参阅 https://github.com/kubernetes/minikube/issues/1690 )。

解决方法很简单:
minikube ssh
sudo ip link set docker0 promisc on