1、producer close, err: kafka: client has run out of available brokers to talk to (Is your cluster reachable?)

       未开放端口，关闭防火墙或者开发指定端口（9092）

firewall-cmd --add-port=9092/tcp --permanent       # 开放 9092 端口

firewall-cmd --reload              # 重新加载

firewall-cmd --list-ports     # 查看所有开放端口

firewall-cmd --add-port=9092/tcp --permanent && firewall-cmd --reload && firewall-cmd --list-ports

2、send msg failed, err: dial tcp [::1]:9092: connectex: No connection could be made because the target

       允许外部端口连接，修改配置文件 config/server.properties

listeners=PLAINTEXT://0.0.0.0:9092        # 监听所有网卡地址，允许外部端口连接     

advertised.listeners=PLAINTEXT://192.168.0.113:9092      # 外部代理地址                   

3、其他问题

https://blog.csdn.net/pbrlovejava/article/details/103451302