一、问题

开发中遇到如下问题：在发送rocketmq消息的时候，包连接异常（RemotingConnectException）
连接broker地址为：10.100.2.0:10911 这一看就不像一个内网地址。
报错信息如下：

Caused by: org.apache.rocketmq.client.exception.MQClientException: Send [3] times, still failed, cost [6005]ms, Topic: recordTopic, BrokersSent: [nb003, nb003, nb003]
See http://rocketmq.apache.org/docs/faq/ for further details.
        at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:665)
        at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1343)
        at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:344)
        at org.apache.rocketmq.spring.core.RocketMQTemplate.syncSend(RocketMQTemplate.java:555)
        ... 73 common frames omitted
Caused by: org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 10.100.2.0:10911 failed
        at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:394)
        at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessageSync(MQClientAPIImpl.java:503)
        at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:487)
        at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:431)
        at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendKernelImpl(DefaultMQProducerImpl.java:854)
        at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:584)
        ... 76 common frames omitted

查看控制台：发现问题一致。

二、问题排查

先排查网络情况：ip addr

由上图发现，默认网卡的内网ip为172.xx.xx.xx （知道这个意思就行）
而实际报错里的 10.100.2.0 为之前安装K8S环境时候安装的网络插件 flannel 的ip段。故是broker 在启动时候网卡读错了。导致ip不对，从而导致连接异常。

三、解决方案

指定broker的ip地址，再启动broker
我的rocketmq的根路径为：/usr/local/rocketmq-all-4.9.1-bin-release
操作如下：
【172.xx.xx.xx改为你自己的ip哈】

[root@nb003 conf]# cd /usr/local/rocketmq-all-4.9.1-bin-release/conf
[root@nb003 conf]# echo "brokerIP1=172.xx.xx.xx" > broker.properties
[root@nb003 conf]# ls
2m-2s-async  2m-2s-sync  2m-noslave  broker.conf  broker.properties  dledger  logback_broker.xml  logback_namesrv.xml  logback_tools.xml  plain_acl.yml  tools.yml
# 先停止broker
[root@nb003 conf]# cd /usr/local/rocketmq-all-4.9.1-bin-release/bin
[root@nb003 bin]# ./mqshutdown broker
The mqbroker(2783) is running...
Send shutdown request to mqbroker(2783) OK
# 再启动broker，并指定配置文件（建议全路径）
[root@nb003 bin]# nohup sh mqbroker -n localhost:9876 -c /usr/local/rocketmq-all-4.9.1-bin-release/conf/broker.properties &
[1] 8705
[root@nb003 bin]# nohup: ignoring input and appending output to ‘nohup.out’

重新查看集群信息：ip已经正确。

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