无法从另一个 docker 容器访问 docker 容器中的 REST 端点

【问题标题】：Cannot access REST endpoint in docker container from another docker container无法从另一个 docker 容器访问 docker 容器中的 REST 端点
【发布时间】：2019-04-28 23:43:48
【问题描述】：

我有 2 个微服务，每个都部署在自己的 docker 容器中。 我使用 docker compose 来部署它们并使 microservice1 了解 microservice2。每个都是在自己的 maven 项目中构建的。

成功部署了两个微服务，创建并启动了 docker 容器，我可以访问每个基本根端点。

问题是，从微服务 1，我想通过微服务 2 的基本根目录访问 /remote url。这不起作用，当调用到达对微服务 2 进行 get 调用的 REST 客户端时，我得到 404，它在下面的 remote() 方法中，见粗体，见下面的stacktrace。

microservice1 公开 2 个 REST 端点：

  1. 获取请求的根路径；
  2. 在 /remote 获取获取请求。

@RequestMapping("/") public String home() { System.out.println("Hello Docker World " + 1); return "Hello Docker World " + 1; }

@GetMapping("/remote") public String remote() { RestTemplate restTemplate = new RestTemplate(); return restTemplate.getForObject("@987654322@", String.class); }

microservice2 公开 1 个 REST 端点：

  1. 获取请求的根路径：

@GetMapping("/") public String home() { System.out.println("Hello Docker World " + 2); return "Hello Docker World " + 2; }

微服务的 Dockerfile1

   FROM openjdk:8-jdk-alpine
   VOLUME /tmp
   ARG DEPENDENCY=target/dependency
   COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
   COPY ${DEPENDENCY}/META-INF /app/META-INF
   COPY ${DEPENDENCY}/BOOT-INF/classes /app
   ENTRYPOINT ["java","-cp","app:app/lib/*","com.mhp.App"]

微服务 2 的 Dockerfile

   FROM openjdk:8-jdk-alpine
   VOLUME /tmp
   ARG DEPENDENCY=target/dependency
   COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
   COPY ${DEPENDENCY}/META-INF /app/META-INF
   COPY ${DEPENDENCY}/BOOT-INF/classes /app
   ENTRYPOINT ["java","-cp","app:app/lib/*","com.mhp.App"]

docker-compose 微服务 1 中的文件：

version: "2"
services:
  microservice2:
    image: microsdocker2/maven-app2:latest
    expose:
      - 8080
    ports:
      - 0.0.0.0:8080:8080/tcp

  microservice1:
    image: microsdocker1/maven-app1:latest
    ports:
      - 0.0.0.0:8090:8080/tcp
    depends_on:
      - microservice2
    links:
      - microservice2

在构建和安装每个映像后，我执行docker-compose up 并成功部署了两个应用程序，并且我可以访问每个微服务的基本根端点。

...
    microservice1_1_2f0ac966a94e | 2018-11-26 14:26:08.955  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path '/maven-app1'
    microservice1_1_2f0ac966a94e | 2018-11-26 14:26:08.960  INFO 1 --- [           main] com.mhp.App                              : Started App in 6.63 seconds (JVM running for 7.358)


...
    microservice2_1_fa2376655f8c | 2018-11-26 14:26:08.090  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path '/maven-app2'
    microservice2_1_fa2376655f8c | 2018-11-26 14:26:08.101  INFO 1 --- [           main] com.mhp.App                              : Started App in 6.821 seconds (JVM running for 7.75)

堆栈跟踪：

 microservice1_1_2f0ac966a94e | 2018-11-27 08:39:33.720 ERROR 1 --- [nio-8080-exec-4] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [/maven-app1] threw exception [Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 404 null] with root cause
microservice1_1_2f0ac966a94e |
microservice1_1_2f0ac966a94e | org.springframework.web.client.HttpClientErrorException: 404 null
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:94) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:79) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:730) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:688) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:644) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:296) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]

微服务1_1_2f0ac966a94e |在 com.mhp.App.remote(App.java:29) ~[app/:na]

microservice1_1_2f0ac966a94e |  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
microservice1_1_2f0ac966a94e |  at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.34.jar:8.5.34]
microservice1_1_2f0ac966a94e |  at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

版本：

spring-boot version 2.0.5.RELEASE
docker version 18.09.0
docker compose version 1.23.1

【问题讨论】：

  • 使用服务名称microservice1 或microservice2 而不是localhost

标签： rest spring-boot docker docker-compose dockerfile


【解决方案1】：

使用服务名称microservice2 而不是localhost

@GetMapping("/remote")
public String remote() {
    RestTemplate restTemplate = new RestTemplate();
    return restTemplate.getForObject("http://microservice2:8080/maven-app2/", String.class);
}

https://docs.docker.com/compose/networking/

默认情况下，Compose 会为您的应用设置一个网络。每个 服务的容器加入默认网络，并且两者都是 该网络上的其他容器可以访问，并且可以被该网络上的其他容器发现 它们的主机名与容器名称相同。

【讨论】：

    猜你喜欢
    • 2020-07-28
    • 1970-01-01
    • 2017-07-12
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 2019-06-13
    • 1970-01-01
    • 2020-05-02
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode