Nacos 集群启动错误

在一台机器上面搭建 nacos-server-2.2.3 集群，启动集群抛 “Failed to bind to address 0.0.0.0/0.0.0.0:9848，java.net.BindException: Address already in use: bind” 错误。

详细错误

详细错误信息如下：

"nacos is starting with cluster"

         ,--.
       ,--.'|
   ,--,:  : |                                           Nacos 2.2.3
,`--.'`|  ' :                       ,---.               Running in cluster mode, All function modules
|   :  :  | |                      '   ,'\   .--.--.    Port: 8847
:   |   \ | :  ,--.--.     ,---.  /   /   | /  /    '   Pid: 10028
|   : '  '; | /       \   /     \.   ; ,. :|  :  /`./   Console: http://10.87.10.89:8847/nacos/index.html
'   ' ;.    ;.--.  .-. | /    / ''   | |: :|  :  ;_
|   | | \   | \__\/: . ..    ' / '   | .; : \  \    `.      https://nacos.io
'   : |  ; .' ," .--.; |'   ; :__|   :    |  `----.   \
|   | '`--'  /  /  ,.  |'   | '.'|\   \  /  /  /`--'  /
'   : |     ;  :   .'   \   :    : `----'  '--'.     /
;   |.'     |  ,     .-./\   \  /            `--'---'
'---'        `--`---'     `----'

2023-10-30 08:40:31,879 INFO The server IP list of Nacos is [127.0.0.1:8847, 127.0.0.1:8848, 127.0.0.1:8849]
...
2023-10-30 08:41:56,499 INFO Nacos Log files: E:\nacos-server-2.2.3-1\logs
2023-10-30 08:41:56,530 INFO Nacos Log files: E:\nacos-server-2.2.3-1\conf
2023-10-30 08:41:56,561 INFO Nacos Log files: E:\nacos-server-2.2.3-1\data
2023-10-30 08:41:56,580 ERROR Startup errors :
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'grpcClusterServer': Invocation of init method failed; nested exception is java.io.IOException: Failed to bind to address 0.0.0.0/0.0.0.0:9848
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:160)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:440)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
        at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$200/1651855867.getObject(Unknown Source)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:745)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:423)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1317)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
        at com.alibaba.nacos.Nacos.main(Nacos.java:35)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)
Caused by: java.io.IOException: Failed to bind to address 0.0.0.0/0.0.0.0:9848
        at io.grpc.netty.shaded.io.grpc.netty.NettyServer.start(NettyServer.java:328)
        at io.grpc.internal.ServerImpl.start(ServerImpl.java:184)
        at io.grpc.internal.ServerImpl.start(ServerImpl.java:93)
        at com.alibaba.nacos.core.remote.grpc.BaseGrpcServer.startServer(BaseGrpcServer.java:106)
        at com.alibaba.nacos.core.remote.BaseRpcServer.start(BaseRpcServer.java:59)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:389)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:333)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:157)
        ... 27 common frames omitted
Caused by: java.net.BindException: Address already in use: bind
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:437)
        at sun.nio.ch.Net.bind(Net.java:429)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
        at io.grpc.netty.shaded.io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:141)
        at io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:562)
        at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1334)
        at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:506)
        at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:491)
        at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:973)
        at io.grpc.netty.shaded.io.netty.channel.AbstractChannel.bind(AbstractChannel.java:260)
        at io.grpc.netty.shaded.io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:356)
        at io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
        at io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
        at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
        at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
        at io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:745)
2023-10-30 08:41:57,140 WARN [WatchFileCenter] start close

2023-10-30 08:41:57,140 WARN [WatchFileCenter] start to shutdown this watcher which is watch : E:\nacos-server-2.2.3-1\conf

2023-10-30 08:41:57,140 WARN [WatchFileCenter] already closed

2023-10-30 08:41:57,171 WARN [NotifyCenter] Start destroying Publisher

2023-10-30 08:41:57,171 WARN [NotifyCenter] Destruction of the end

2023-10-30 08:41:57,186 ERROR Nacos failed to start, please see E:\nacos-server-2.2.3-1\logs\nacos.log for more details.

2023-10-30 08:41:57,485 WARN [ThreadPoolManager] Start destroying ThreadPool

2023-10-30 08:41:57,485 WARN [ThreadPoolManager] Destruction of the end

nacos 广告位

原因分析

Nacos 默认端口是 8848，2.0 版本后另外还占用 9848,9849 两个端口，这两个是 gRPC 端口，用于服务端与客户端通讯，所以在单机上配置集群节点，节点要配置的端口不能连续，否则在启动时报端口占用的错误。

• 9848 端口：与主端口（8848）偏移量为 1000，用来客户端gRPC请求服务端口，用户客户端向服务端发起连接和请求
  

• 9849 端口：与主端口（8848）偏移量为 1001，用来服务端gRPC请求服务端口，用于服务间同步等

注意：Nacos 单机集群，端口不能连续；而且 Nginx 反向代理，需要配置 gRPC 端口映射。

例如，我们使用连续端口：

8847  -> gRPC 端口：9847,9848

8848  -> gRPC 端口：9848,9849

8849  -> gRPC 端口：9849,9850

上面连续端口根据偏移量计算出的 gRPC 端口中，9848、9849 两个端口冲突了，所以启动失败。

解决办法

将 Nacos 的端口错开修改，如：

8748

8848

8948