kafka的配置

测试环境kafka配置了认证模式
security.inter.broker.protocol=SASL_PLAINTEXT
sasl.enabled.mechanisms=PLAIN

logstash配置

如果配置成这样，直接启动后， 无法链接上 kafka，报错如下：

[2022-11-03 10:53:32,911] WARN [Producer clientId=console-producer] 
Connection to node -1 (localhost/127.0.0.1:9092) could not be established. 
Broker may not be available. (org.apache.kafka.clients.NetworkClient)

或者如下报错：

[2022-11-03 11:25:21,337] INFO [SocketServer listenerType=ZK_BROKER, nodeId=0]
 Failed authentication with / (Unexpected Kafka request of type
  METADATA during SASL handshake.) (org.apache.kafka.common.network.Selector)

原因

由于 kafka开启了认证，因此如果 消费者不加认证参数，就没有办法成功链接

修改

修改 logstash 中关于input配置
增加认证配置：

security_protocol => "SASL_PLAINTEXT"
sasl_mechanism => "PLAIN"
sasl_jaas_config => "org.apache.kafka.common.security.plain.PlainLoginModule required username='xxx'  password='xxx';"

参考

https://blog.csdn.net/Entity_G/article/details/125791947
https://www.cnblogs.com/yjt1993/p/14739130.html
https://deepmind.t-salon.cc/article/5491
https://yanbin.blog/kafka-enable-saslacl/
https://www.elastic.co/guide/en/logstash/index.html