问题描述

如下图所示，服务1和网关部署在服务器1上，服务2和nacos部署在服务器2上。网关调用服务1成功，调用服务2失败。报错如下：

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io.netty.channel.ConnectTimeoutException: connection timed out: /10.0.0.12:8888
        at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$2.run(AbstractEpollChannel.java:576) ~[netty-transport-native-epoll-4.1.59.Final-linux-x86_64.jar!/:4.1.59.Final]
        Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
        |_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
        |_ checkpoint ⇢ HTTP GET "/app/blog/selectBlogPageByViews?pageNum=1&pageSize=15" [ExceptionHandlingWebHandler]
Stack trace:
                at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$2.run(AbstractEpollChannel.java:576) ~[netty-transport-native-epoll-4.1.59.Final-linux-x86_64.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:170) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384) ~[netty-transport-native-epoll-4.1.59.Final-linux-x86_64.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.59.Final.jar!/:4.1.59.Final]
                at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_312]

问题排查

注意报错第一行：

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io.netty.channel.ConnectTimeoutException: connection timed out: /10.0.0.12:8888

调用ip为10.0.0.12，为网卡地址：

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eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.12  netmask 255.255.252.0  broadcast 10.0.3.255
        inet6 fe80::5054:ff:fe8d:bde  prefixlen 64  scopeid 0x20<link>
        ether 52:54:00:8d:0b:de  txqueuelen 1000  (Ethernet)
        RX packets 1405478  bytes 959876907 (915.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1095472  bytes 217959210 (207.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

img

说明nacos默认使用内网ip注册，不同内网之间不互通，因此调用失败。

解决方式

参考文档：spring-cloud-starter-alibaba-nacos-discovery文档

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服务注册到Nacos时，默认使用的是网卡地址，为内网。服务运行在不同的服务器上，内网不互通，因此调用失败。我们可以在服务注册时，手动配置注册ip地址，填写公网即可。

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spring:
  cloud:
    nacos:
      discovery:
        ip: xxxx  # 填写公网ip