我正在尝试从Apache Flume向Apache Kafka实例发送消息。当通过localhost本地执行此操作时，我没有任何问题。当我在我的机器上的不同虚拟机上尝试此操作时，我在Flume的DEBUG日志中拒绝连接。关于演示，我只是通过telnet将消息发送到我的Flume实例。
172.16.26.1是虚拟机看到的我的mac的IP
172.16.26.138是运行Kafka / Zookeeper的VM的IP
172.16.26.139是运行Flume的VM的IP
Flume配置
#Name the components of this agent
a1.sources = r1
a1.sinks = k1
a1.channels = c1
#Describe/configure the source
a1.sources.r1.type = netcat
a1.sources.r1.port = 44444
a1.sources.r1.bind = 0.0.0.0
a1.sources.r1.host = 172.16.26.1
#Describe the sink
a1.sinks.k1.type = org.apache.flume.sink.kafka.KafkaSink
a1.sinks.k1.kafka.topic = macdemo
a1.sinks.k1.kafka.bootstrap.servers = 172.16.26.138:9092
a1.sinks.k1.kafka.flumeBatchSize = 20
a1.sinks.k1.kafka.producer.acks = 1
a1.sinks.k1.kafka.producer.linger.ms = 1
a1.sinks.k1.kafka.producer.compression.type = snappy
#Use a channel which buffers events in memory
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
#Bind the source and sink to the channel
a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1
Kafka配置（关键部分，其他一切都是默认配置）
broker.id=0
listeners=PLAINTEXT://localhost:9092
zookeeper.connect=localhost:2181
以下是代理启动时从Flume打印的配置
compression.type = snappy
metric.reporters = []
metadata.max.age.ms = 300000
metadata.fetch.timeout.ms = 60000
reconnect.backoff.ms = 50
sasl.kerberos.ticket.renew.window.factor = 0.8
bootstrap.servers = [172.16.26.138:9092]
retry.backoff.ms = 100
sasl.kerberos.kinit.cmd = /usr/bin/kinit
buffer.memory = 33554432
timeout.ms = 30000
key.serializer = class org.apache.kafka.common.serialization.StringSerializer
sasl.kerberos.service.name = null
sasl.kerberos.ticket.renew.jitter = 0.05
ssl.keystore.type = JKS
ssl.trustmanager.algorithm = PKIX
block.on.buffer.full = false
ssl.key.password = null
max.block.ms = 60000
sasl.kerberos.min.time.before.relogin = 60000
connections.max.idle.ms = 540000
ssl.truststore.password = null
max.in.flight.requests.per.connection = 5
metrics.num.samples = 2
client.id =
ssl.endpoint.identification.algorithm = null
ssl.protocol = TLS
request.timeout.ms = 30000
ssl.provider = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
acks = 1
batch.size = 16384
ssl.keystore.location = null
receive.buffer.bytes = 32768
ssl.cipher.suites = null
ssl.truststore.type = JKS
security.protocol = PLAINTEXT
retries = 0
max.request.size = 1048576
value.serializer = class org.apache.kafka.common.serialization.ByteArraySerializer
ssl.truststore.location = null
ssl.keystore.password = null
ssl.keymanager.algorithm = SunX509
metrics.sample.window.ms = 30000
partitioner.class = class org.apache.kafka.clients.producer.internals.DefaultPartitioner
send.buffer.bytes = 131072
linger.ms = 1
有效的方案
Flume / Kafka / Zookeeper全部从Mac本地运行 - ＆gt;作品
VM中的Flume（在Mac上），Kafka / Zookeeper从Mac本地运行 - ＆gt;作品
VM中的Flume（在mac上），VM中的Kafka / Zookeeper（在mac上） - ＆gt;连接被拒绝
这是我得到的输出错误
2018-02-26 14:23:47,009 (kafka-producer-network-thread | producer-1) [DEBUG - org.apache.kafka.common.network.Selector.poll(Selector.java:307)] Connection with /172.16.26.138 disconnected
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at org.apache.kafka.common.network.PlaintextTransportLayer.finishConnect(PlaintextTransportLayer.java:54)
at org.apache.kafka.common.network.KafkaChannel.finishConnect(KafkaChannel.java:72)
at org.apache.kafka.common.network.Selector.poll(Selector.java:274)
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:256)
at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:216)
at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:128)
at java.lang.Thread.run(Thread.java:748)
2018-02-26 14:23:47,010 (kafka-producer-network-thread | producer-1) [DEBUG - org.apache.kafka.clients.NetworkClient.handleDisconnections(NetworkClient.java:454)] Node -1 disconnected.
2018-02-26 14:23:47,011 (kafka-producer-network-thread | producer-1) [DEBUG - org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:608)] Give up sending metadata request since no node is available
我确信有一些超级简单的东西我可以忽略，但是谷歌博士已经花了好几天没有运气。关于VM，它们在Centos 7上运行，我的firewalld.service与SELinux一起被禁用。
答案 0 :(得分：1)
我发现的问题是侦听器= PLAINTEXT：// localhost：9092设置。将localhost更改为VM的实际IP地址（kafka的IP）。