堆棧內存溢出
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無法從另一個Docker容器訪問Docker容器中的REST端點

[英]Cannot access REST endpoint in docker container from another docker container

 原文  2018-11-27 09:13:46  5   1    rest/ spring-boot/ docker/ docker-compose/ dockerfile

問題描述

我有2個微服務，每個微服務都部署在自己的docker容器中。 我使用docker compose來部署它們並使microservice1意識到microservice2。 每個人都在自己的Maven項目中構建。

兩種微服務均已成功部署，docker容器已創建並啟動，我可以訪問每個基本根端點。

問題是從microservice1，我想從microservice2訪問槽/ remote url的基本根。 這不起作用，當調用到達REST客戶端時，我得到404，該客戶端對位於remote()方法下面的microservice2進行get調用，請參見粗體，請參見stacktrace 。

microservice1公開了2個REST端點：

  1. 在根路徑上獲取請求；
  2. 在/ remote獲取請求。

@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(" http://localhost:8080/maven-app2/ ", String.class); }

microservice2公開了1個REST端點：

  1. 在根路徑處獲取請求：

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

用於微服務的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"]

用於微服務的Dockerfile2 

   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"]

microservice1中的docker-compose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

在構建和安裝每個映像之后，我執行了docker-compose up成功部署了兩個應用程序，並且可以訪問每個微服務的基本根端點。 

...
    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)

堆棧跟蹤 ： 

 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]

microservice1_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

1 個解決方案

解決方案1
 1 已采納  2018-11-27 09:38:56

使用服務名稱microservice2代替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/

默認情況下，Compose為您的應用設置單個網絡。 服務的每個容器都加入默認網絡，並且都可以被該網絡上的其他容器訪問，並且可以在與容器名稱相同的主機名下被發現。

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