问题：
1、Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to <172.17.42.1:10911> failed
2、com.alibaba.rocketmq.client.exception.MQClientException: Send [1] times, still failed, cost [1647]ms, Topic: TopicTest1, BrokersSent: [broker-a, null, null]
3、org.apache.rocketmq.client.exception.MQClientException: Send [3] times, still failed, cost [497]ms, Topic: TopicTest, BrokersSent: [chenyaowudeMacBook-Air.local, chenyaowudeMacBook-Air.local, chenyaowudeMacBook-Air.local]
解决：多网卡问题处理
1、设置producer: producer.setVipChannelEnabled(false);
2、编辑ROCKETMQ 配置文件：broker.conf（下列ip为自己的ip）
namesrvAddr = 192.168.0.101:9876
brokerIP1 = 192.168.0.101
4、DESC: service not available now, maybe disk full, CL:
解决：修改启动脚本runbroker.sh，在里面增加一句话即可：
JAVA_OPT=”${JAVA_OPT} -Drocketmq.broker.diskSpaceWarningLevelRatio=0.98″
（磁盘保护的百分比设置成98%，只有磁盘空间使用率达到98%时才拒绝接收producer消息）
常见问题处理：
https://blog.csdn.net/sqzhao/article/details/54834761
https://blog.csdn.net/mayifan0/article/details/67633729
https://blog.csdn.net/a906423355/article/details/78192828