Kafka 0.10 SASL/PLAIN producer timeout

Question

I've got a 3 broker kerberised Kafka 0.10 install running in Cloudera and I'm trying to authenticate with SASL/PLAIN

I'm passing kafka_server_jaas.conf into the JVM on each of the brokers.

KafkaServer { org.apache.kafka.common.security.plain.PlainLoginModule required username=admin password=password1 user_admin=password1 user_remote=password1; };

My server.properties (or kafka.properties as Cloudera renames it) is set as below;

listeners=SASL_SSL://10.10.3.47:9093 # ip set for each broker advertised.listeners=SASL_SSL://10.10.3.47:9093 # ip set for each broker sasl.enabled.mechanisms=GSSAPI,PLAIN security.inter.broker.protocol=SASL_SSL sasl.mechanism.inter.broker.protocol=GSSAPI

When Kafka starts up, the inter-broker communication is all fine, but when I try to connect using the console producer I get a Timeout failed to update metadata

bin/kafka-consolproducer --broker-list 10.10.3.161:9093 --topic test1 --producer.config client.properties.plain

client.properties.plain is set to

security.protocol=SASL_SSL sasl.mechanism=PLAIN

finally, the client side jaas.conf

KafkaClient { org.apache.kafka.common.security.plain.PlainLoginModule required username="remote" password="password1"; };

As far as I can tell I've followed all instructions correctly, can anyone see anything wrong?

Update I've turned the logging on the console consumer up a bit, I'm getting the following error;

[2017-03-02 13:17:50,817] TRACE SSLHandshake NEED_UNWRAP channelId -1, handshakeResult Status = OK HandshakeStatus = FINISHED bytesConsumed = 101 bytesProduced = 0, appReadBuffer pos 0, netReadBuffer pos 0, netWriteBuffer pos 101 (org.apache.kafka.common.network.SslTransportLayer) [2017-03-02 13:17:50,817] TRACE SSLHandshake FINISHED channelId -1, appReadBuffer pos 0, netReadBuffer pos 0, netWriteBuffer pos 101 (org.apache.kafka.common.network.SslTransportLayer) [2017-03-02 13:17:50,817] DEBUG Set SASL client state to RECEIVE_HANDSHAKE_RESPONSE (org.apache.kafka.common.security.authenticator.SaslClientAuthenticator) [2017-03-02 13:17:50,818] DEBUG Set SASL client state to INITIAL (org.apache.kafka.common.security.authenticator.SaslClientAuthenticator) [2017-03-02 13:17:50,819] DEBUG Set SASL client state to INTERMEDIATE (org.apache.kafka.common.security.authenticator.SaslClientAuthenticator) [2017-03-02 13:17:50,820] DEBUG Connection with <IPADDESS_REMOVED> disconnected (org.apache.kafka.common.network.Selector) java.io.EOFException at org.apache.kafka.common.network.SslTransportLayer.read(SslTransportLayer.java:488) at org.apache.kafka.common.network.NetworkReceive.readFromReadableChannel(NetworkReceive.java:81) at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:71) at org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.receiveResponseOrToken(SaslClientAuthenticator.java:239) at org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.authenticate(SaslClientAuthenticator.java:182) at org.apache.kafka.common.network.KafkaChannel.prepare(KafkaChannel.java:64) at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:318) at org.apache.kafka.common.network.Selector.poll(Selector.java:283) at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:260) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.clientPoll(ConsumerNetworkClient.java:360) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:224) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:192) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.awaitMetadataUpdate(ConsumerNetworkClient.java:134) at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:183) at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:974) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:938) at kafka.consumer.NewShinyConsumer.<init>(BaseConsumer.scala:61) at kafka.tools.ConsoleConsumer$.run(ConsoleConsumer.scala:64) at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:51) at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala) [2017-03-02 13:17:50,821] DEBUG Node -1 disconnected. (org.apache.kafka.clients.NetworkClient)

Answer 1

I had a similar issue with SASL_PLAINTEXT auth. I was able to connect to the broker (via kafka-python), but any messages I sent from the producer would simply time out.

I ended up advertising both SASL_PLAINTEXT and PLAINTEXT listeners, but only publicly exposed the SASL_PLAINTEXT listener via AWS security groups.

My server_jaas.conf was basically the same.

My server.properties used these settings:

security.inter.broker.protocol=PLAINTEXT
sasl.mechanism.inter.broker.protocol=PLAIN
sasl.enabled.mechanisms=PLAIN
advertised.listeners=SASL_PLAINTEXT://example.com:9095,PLAINTEXT://example.com:9092
listeners = SASL_PLAINTEXT://0.0.0.0:9095,PLAINTEXT://0.0.0.0:9092

I was debugging this with the kafka-python client and my command looked like this (python)

from kafka import KafkaProducer
producer = KafkaProducer(bootstrap_servers='example.com:9095', security_protocol="SASL_PLAINTEXT", sasl_mechanism='PLAIN', sasl_plain_username='username', sasl_plain_password='password')

With this setup I was able to have username/password authentication and also produce and consume messages to the broker without timeouts.

Hope this helps in some way :)

Answer 2

In my case there was no need for adding a plaintext listener or for advertising the listener. Instead, the issue was in my kafka_server_jaas.conf. Setting the username property to the name used by the client to log in solved the issue for me.