同一台服务器, 启动nacos集群,出现端口占用问题,具体问题如下 (版本号 : 2.0.0-ALPHA.2)

[bravelionet]

1. 同一台服务器在启动nacos多个实例时, conf/application.properties port 已经修改为不同端口,仍然出现, io.grpc.netty.shaded.io.netty.channel.unix.Errors$NativeIoException: bind(..) failed: Address already in use
2. 在出现以上错误, 毫无头绪查找, 个人建议报错再详细点，比如加上哪个端口号被占用，比如port 8848 address already in use

[xuhui54]

遇到相同问题，
错误堆栈
2021-02-04 17:08:04,756 ERROR Startup errors : {}

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'grpcSdkServer': Invocation of init method failed; nested exception is java.io.IOException: Failed to bind
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:413)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1761)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:866)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
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:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
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
at io.grpc.netty.shaded.io.grpc.netty.NettyServer.start(NettyServer.java:246)
at io.grpc.internal.ServerImpl.start(ServerImpl.java:184)
at io.grpc.internal.ServerImpl.start(ServerImpl.java:90)
at com.alibaba.nacos.core.remote.grpc.BaseGrpcServer.startServer(BaseGrpcServer.java:142)
at com.alibaba.nacos.core.remote.BaseRpcServer.start(BaseRpcServer.java:46)
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:498)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
... 26 common frames omitted
Caused by: java.net.BindException: Address already in use: bind

[KomachiSion]

2.0需要4个端口

server.port(默认8848）

raft port: ${server.port} - 1000
grpc port: ${server.port} + 1000
grpc port for server: ${server.port} + 1001

[xuhui54]

重启电脑。 修改个节点application.properties的port。随意启动一台正常，当启动第二台后就会报Error creating bean with name 'grpcSdkServer': Invocation of init method failed; nested exception is java.io.IOException: Failed to bind

[bravelionet]

您好，看到你所发的案例公式，server.port不同，后续三个端口也不会冲突吧，前提是服务器未启动任何程序的情况下仍然出现了该问题 @KomachiSion

[KomachiSion]

如果同一台机器， 启动2台以上服务端，那么必须确保4个port都不被占用。

比如第一个启动8848， 第二个启动9848， 那么9848会被第一个进程的grpc占用，导致无法启动。

Failed to bind 必然是端口被占用了，可能是你自己的程序占用的。只能自己排查环境。

[lucky2u]

您好，看到你所发的案例公式，server.port不同，后续三个端口也不会冲突吧，前提是服务器未启动任何程序的情况下仍然出现了该问题 @KomachiSion

我还不行哎

[dashuaibi2018]

2.0需要4个端口

server.port(默认8848）

raft port: ${server.port} - 1000
grpc port: ${server.port} + 1000
grpc port for server: ${server.port} + 1001

感谢 端口连续了 导致冲突了

[dashuaibi2018]

您好，看到你所发的案例公式，server.port不同，后续三个端口也不会冲突吧，前提是服务器未启动任何程序的情况下仍然出现了该问题 @KomachiSion

我还不行哎

集群端口号不能是三个连续的

[woshishitou]

我今天也遇到了，结果发现是9849端口被某个服务跟redis的一个连接给占用了

[yuanweiGit]

2.0+之后的端口带有偏移量 尽量不要连续性 实测8843 8846 8849 这样是可以的

[Luxianshen]

2.0+之后的端口带有偏移量 尽量不要连续性 实测8843 8846 8849 这样是可以的

1.4.1 多启动个2.1.1 8849 不行

[mouday]

1.4.2版本，以下配置也不行，端口占用

192.168.0.105:8845
192.168.0.105:8850
192.168.0.105:8855

[xinxinQ]

version 2.2.3 cluster 相同ip端口分別用 8149 8249 8349 亲测可用

[2623574740]

我自己做了nacos镜像，在同一个自定义的docker network里生成3个容器，端口号没有改（沿用8848,7848,9848,9849），报错
Caused by: java.io.IOException: Failed to bind to address 0.0.0.0/0.0.0.0:7848 at io.grpc.netty.shaded.io.grpc.netty.NettyServer.start(NettyServer.java:328) at io.grpc.internal.ServerImpl.start(ServerImpl.java:185) at io.grpc.internal.ServerImpl.start(ServerImpl.java:94) at com.alipay.sofa.jraft.rpc.impl.GrpcServer.init(GrpcServer.java:108) at com.alipay.sofa.jraft.rpc.impl.GrpcServer.init(GrpcServer.java:61) at com.alibaba.nacos.core.distributed.raft.JRaftServer.start(JRaftServer.java:205) ... 129 common frames omitted Caused by: io.grpc.netty.shaded.io.netty.channel.unix.Errors$NativeIoException: bind(..) failed: Address already in use