org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to <172.17.128.11:30909> failed

引用提供了一种在RocketMQ中手动添加topic的方法，可以通过执行命令`sh mqadmin updateTopic -n XXX:9876 -b XXX:10911 -t ESOrderListTopic`来实现。然后，可以启动broker来测试发送和接收消息，命令为`nohup sh bin/mqbroker -n localhost:9876 & tail -f bin/nohup.out`。在发送和接收消息之前，需要告诉客户端name servers的地址。可以使用环境变量NAMESRV_ADDR来设置name servers的地址，命令为`export NAMESRV_ADDR=localhost:9876`。接下来，可以使用命令`sh bin/tools.sh org.apache.rocketmq.example.quickstart.Producer`来发送消息，使用命令`sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer`来接收消息。如果遇到了`org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to <172.17.128.11:30909> failed`这个问题，可能是连接到指定的主机和端口失败导致的。您可以检查主机和端口是否正确，并确保RocketMQ服务正在运行。另外，也可以尝试使用`sh bin/mqshutdown broker`命令来关闭broker，然后再重新启动。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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