kafka-server-start.sh failed with advertised.listeners set-CodePudding

I am trying to start my kafka server on my localhost, and with the following two settings in config/server.properties:

listeners=PLAINTEXT://127.0.0.1:9092

# Listener name, hostname and port the broker will advertise to clients.
# If not set, it uses the value for "listeners".
advertised.listeners=PLAINTEXT://host.docker.internal:9092

The reason I set advertised.listeners is because I want to run kafka-ui docker container, and it will connect to that listener, but as long as I set advertised.listeners, bin/kafka-server-start.sh config/server.properties failed with the following error:

[2023-01-12 00:06:33,814] WARN [Controller id=0, targetBrokerId=0] Error connecting to node host.docker.internal:9092 (id: 0 rack: null) (org.apache.kafka.clients.NetworkClient)
java.net.UnknownHostException: host.docker.internal
    at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:952)
    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1658)
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1524)
    at org.apache.kafka.clients.DefaultHostResolver.resolve(DefaultHostResolver.java:27)
    at org.apache.kafka.clients.ClientUtils.resolve(ClientUtils.java:110)
    at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.currentAddress(ClusterConnectionStates.java:510)
    at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.access$200(ClusterConnectionStates.java:467)
    at org.apache.kafka.clients.ClusterConnectionStates.currentAddress(ClusterConnectionStates.java:173)
    at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:990)
    at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:301)
    at org.apache.kafka.clients.NetworkClientUtils.awaitReady(NetworkClientUtils.java:64)
    at kafka.controller.RequestSendThread.brokerReady(ControllerChannelManager.scala:292)
    at kafka.controller.RequestSendThread.doWork(ControllerChannelManager.scala:246)
    at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:96)

If I comment out advertised.listeners, it will work.

Can someone help me.

CodePudding user response：

Maybe the Kafka broker is unable to resolve the hostname "host.docker.internal". Try to add an IP address instead hostname (advertised.listeners=PLAINTEXT://xx.x.x.x:9092)

or add the hostname to /etc/hosts

Where is Kafka Broker running ?? Inside the Docker container??