J'ai 2 microservices, chacun déployé dans son propre conteneur docker. J'utilise docker compose afin de les déployer et rendre microservice1 conscient de microservice2. Chacun est construit dans son propre projet maven.
Les deux microservices sont déployés avec succès, les conteneurs docker sont créés et démarrés et je peux accéder à chaque point de terminaison racine de base.
Le problème est qu'à partir de microservice1, je souhaite accéder à la racine / à l'URL distante de la racine de base à partir de microservice2. Cela ne fonctionne pas et j'obtiens 404 lorsque l'appel atteint le client REST qui fait l'appel get à microservice2 qui est dans la remote()
méthode ci-dessous, voir gras, voir stacktrace ci-dessous.
microservice1 expose 2 points de terminaison REST:
@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 expose 1 point de terminaison REST:
@GetMapping("/") public String home() { System.out.println("Hello Docker World " + 2); return "Hello Docker World " + 2; }
Dockerfile pour microservice1
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"]
Dockerfile pour microservice2
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"]
fichier docker-compose dans microservice1:
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
après avoir créé et installé chaque image, j'exécute le docker-compose up
et je fais déployer les deux applications avec succès et je peux accéder au point de terminaison racine de base de chaque microservice.
...
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)
trace de la pile :
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 | à 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]
versions:
spring-boot version 2.0.5.RELEASE
docker version 18.09.0
docker compose version 1.23.1
Utilisez le nom du service microservice2
au lieu delocalhost
@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/
Par défaut, Compose configure un seul réseau pour votre application. Chaque conteneur d'un service rejoint le réseau par défaut et est à la fois accessible par d'autres conteneurs sur ce réseau et détectable par eux à un nom d'hôte identique au nom du conteneur.
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laisse moi dire quelques mots