kafka SASL认证失败原因（failed authentication due to: Authentication failed: Invalid username or password）

• 最近在Linux系统搭建kafka的过程中，为了安全性，使用了SASL的认证模式，遇到如下报错？

  ERROR [KafkaServer id=0] Connection to node 0 (hh.com/ip:9092) failed authentication due to: Authentication failed: Invalid username or password (org.apache.kafka.clients.NetworkClient)
  [2021-7-14 16:52:] WARN Authentication failed: Invalid username or password (kafka.utils.CoreUtils$)
  org.apache.kafka.common.errors.SaslAuthenticationException: Authentication failed: Invalid username or password

• 解答：zookeeper 的sasl的配置文件如下：

Server {
    org.apache.kafka.common.security.plain.PlainLoginModule required
    username="cluster"
    password="admin_pwd"
    user_kafka="kafka_pwd";
};

kafka SASL配置文件如下：其中 username="admin"
 password="1234admin" 和
 user_admin="1234admin" 配置中必须保持一致，不然就会报错

KafkaServer {
 org.apache.kafka.common.security.plain.PlainLoginModule required
 username="admin"
 password="1234admin"
 user_admin="1234admin"
 user_alice="alice1213" ;
};
Client {
 org.apache.kafka.common.security.plain.PlainLoginModule required  
 username="kafka"
 password="kafka_pwd";
};