GitHub user elfwalk closed a discussion:
docker部署5.1.1版本的controller模式，跨主机的broker主从不同步，也无法自动切换
**环境：**
1. 2台虚机：hostA 194.0.11.118、hostB 194.0.11.119
2. docker镜像：apache/rocketmq:5.1.1
3. hostA部署: nameserver+controller 3容器 + 2broker
```
#ControllerGroup RaftGroup
#ControllerLeaderId n1
#ControllerLeaderAddress 194.0.11.118:10082
#Peer: n0:194.0.11.118:10081
#Peer: n1:194.0.11.118:10082
#Peer: n2:194.0.11.118:10083
```
4. hostB部署: 1broker
**现象：**
```
#brokerName broker-a
#MasterBrokerId 1
#MasterAddr 194.0.11.118:10111
#MasterEpoch 3
#SyncStateSetEpoch 6
#SyncStateSetNums 2
InSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=1,
brokerAddress='194.0.11.118:10111', alive=true}
InSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=2,
brokerAddress='194.0.11.118:10211', alive=true}
NotInSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=3,
brokerAddress='194.0.11.119:10311', alive=true}
```
```
#clusterName DCluster
#brokerName broker-a
#brokerAddr 194.0.11.118:10111
#brokerId 0
#Epoch: EpochEntry{epoch=1, startOffset=0, endOffset=0}
#clusterName DCluster
#brokerName broker-a
#brokerAddr 194.0.11.119:10311
#brokerId 3
#clusterName DCluster
#brokerName broker-a
#brokerAddr 194.0.11.118:10211
#brokerId 2
#Epoch: EpochEntry{epoch=1, startOffset=0, endOffset=0}
```
本来是hostA和hostB各自部署一个broker，作为主从，但hostB的broker一直无法加入SyncStateSet，导致主从无法同步，也就无法自动切换主从
不确定是否有关的报错信息：
```
ERROR FlowMonitor - Interrupted
java.lang.InterruptedException: null
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1039)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
at
org.apache.rocketmq.common.CountDownLatch2.await(CountDownLatch2.java:114)
at
org.apache.rocketmq.common.ServiceThread.waitForRunning(ServiceThread.java:117)
at org.apache.rocketmq.store.ha.FlowMoni
```
```
ERROR NettyServerCodecThread_3 - decode exception, 194.0.11.118:38438
io.netty.handler.codec.TooLongFrameException: Adjusted frame length exceeds
16777216: 1195725860 - discarded
at
io.netty.handler.codec.LengthFieldBasedFrameDecoder.fail(LengthFieldBasedFrameDecoder.java:503)
at
io.netty.handler.codec.LengthFieldBasedFrameDecoder.failIfNecessary(LengthFieldBasedFrameDecoder.java:489)
```
194.0.11.118:38438 这端口是随机生成的？容器没映射端口肯定不通
尝试在hostA中再部署一个broker容器后，又发现新的broker可以正常加入SyncStateSet，主从切换也正常。
**怀疑：**
brokerIP1都有配成宿主机的IP，但broker间的通信是否走容器的私有IP，这样就能解释同一台的容器通信正常，跨主机的通信失败
大家是否有碰到同样问题的？有什么方法可以查看或验证broker间的通信是否正常？
GitHub link: https://github.com/apache/rocketmq/discussions/6914
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