https://www.cnblogs.com/xuliang666/p/11871389.html
在 config/server.properties 中 配置項
listeners
listeners就是主要用來定義Kafka Broker的Listener的配置項，用於本機監聽。
advertised.listeners
advertised.listeners參數的作用就是將Broker的Listener信息發布到Zookeeper供客戶端使用監聽，是真正的對外代理地址。如果沒有設置，會用listeners。
外部連接訪問這個，需要設置這個值，
如 java/spring 代碼連接kafka ，如果不設置advertised.listeners，就連接不上 報錯：
Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
# The address the socket server listens on. It will get the value returned from
# java.net.InetAddress.getCanonicalHostName() if not configured.
# FORMAT:
# listeners = listener_name://host_name:port
# EXAMPLE:
# listeners = PLAINTEXT://your.host.name:9092
#listeners=PLAINTEXT://:9092
# Hostname and port the broker will advertise to producers and consumers. If not set,
# it uses the value for "listeners" if configured. Otherwise, it will use the value
# returned from java.net.InetAddress.getCanonicalHostName().
#advertised.listeners=PLAINTEXT://your.host.name:9092
advertised.listeners=PLAINTEXT://192.168.20.10:9092 # 配置了本機ip