Spring Boot Actuator 显示微服务的状态关闭
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【中文标题】Spring Boot Actuator 显示微服务的状态关闭【英文标题】：Spring Boot Actuator shows status down for microservices 【发布时间】：2020-05-27 05:32:30 【问题描述】：我正在尝试为我的微服务添加 Eureka 服务，但是即使微服务正在运行并且消息传递工作正常，Eureka 也无法发现服务，因为它们已关闭？这是 http://localhost:8080/actuator/health
的输出
"status": "DOWN",
"components":
"binders":
"status": "UP",
"components":
"rabbit":
"status": "UP",
"details":
"version": "3.7.8"
,
"coreServices":
"status": "DOWN",
"details":
"movie":
"status": "DOWN",
"details":
"error": "io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: movie/172.21.0.8:80"
,
"reviews":
"status": "DOWN",
"details":
"error": "io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: review/172.21.0.9:80"
,
"recommendations":
"status": "DOWN",
"details":
"error": "io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: recommendation/172.21.0.6:80"
,
"discoveryComposite":
"description": "Discovery Client not initialized",
"status": "UNKNOWN",
"components":
"discoveryClient":
"description": "Discovery Client not initialized",
"status": "UNKNOWN"
,
"diskSpace":
"status": "UP",
"details":
"total": 84014424064,
"free": 28400906240,
"threshold": 10485760
,
"ping":
"status": "UP"
,
"rabbit":
"status": "UP",
"details":
"version": "3.7.8"
,
"reactiveDiscoveryClients":
"description": "Discovery Client not initialized",
"status": "UNKNOWN",
"components":
"Simple Reactive Discovery Client":
"description": "Discovery Client not initialized",
"status": "UNKNOWN"
这是为什么呢？通过运行 docker ps 所有这些都可用：
(base) mat@mat-Vostro-5471:~/Projects/movie-rest-services$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
376da889ce8c movie-rest-services_review "java -jar /app.jar" 23 minutes ago Up 23 minutes 8080/tcp movie-rest-services_review_1
f4fe8c2668f2 movie-rest-services_movie "java -jar /app.jar" 23 minutes ago Up 23 minutes 8080/tcp movie-rest-services_movie_1
b2fa74bdb3ea movie-rest-services_movie-composite "java -jar /app.jar" 23 minutes ago Up 23 minutes 0.0.0.0:8080->8080/tcp movie-rest-services_movie-composite_1
d45062ca4e0c movie-rest-services_recommendation "java -jar /app.jar" 23 minutes ago Up 23 minutes 8080/tcp movie-rest-services_recommendation_1
a16db364e277 movie-rest-services_eureka "java -jar /app.jar" 23 minutes ago Up 23 minutes 0.0.0.0:8761->8761/tcp movie-rest-services_eureka_1
fd6b45ade9c3 rabbitmq:3.7.8-management "docker-entrypoint.s…" 23 minutes ago Up 23 minutes (healthy) 4369/tcp, 5671/tcp, 0.0.0.0:5672->5672/tcp, 15671/tcp, 25672/tcp, 0.0.0.0:15672->15672/tcp movie-rest-services_rabbitmq_1
68c9e3e92256 mongo:3.6.9 "docker-entrypoint.s…" 23 minutes ago Up 23 minutes (healthy) 0.0.0.0:27017->27017/tcp movie-rest-services_mongodb_1
2ad058b543d8 mysql:5.7 "docker-entrypoint.s…" 23 minutes ago Up 23 minutes (healthy) 0.0.0.0:3306->3306/tcp, 33060/tcp movie-rest-services_mysql_1
我所有的微服务（包括复合）都有 spring.application.name 和 eureka 配置集，例如：
spring.application.name: movie
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
initialInstanceInfoReplicationIntervalSeconds: 5
registryFetchIntervalSeconds: 5
instance:
leaseRenewalIntervalInSeconds: 5
leaseExpirationDurationInSeconds: 5
而 Eureka 服务应用程序看起来像：
server:
port: 8761
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://$eureka.instance.hostname:$server.port/eureka/
# from: https://github.com/spring-cloud-samples/eureka/blob/master/src/main/resources/application.yml
server:
waitTimeInMsWhenSyncEmpty: 0
response-cache-update-interval-ms: 5000
management.endpoints.web.exposure.include: "*"
我正在检查微服务是启动还是停止（我将坚持上面描述的电影示例）：
private Mono<Health> getHealth(String url)
url += "/actuator/health";
log.info("Will call the Health API on URL: ", url);
return getWebClient().get().uri(url).retrieve().bodyToMono(String.class)
.map(s -> new Health.Builder().up().build())
.onErrorResume(ex -> Mono.just(new Health.Builder().down(ex).build()))
.log();
网址在哪里： 私有最终字符串 MOVIE_SERVICE_URL = "http://movie";
这将给出以下输出：
movie-composite_1 | 2020-02-11 18:03:07.251 INFO 1 --- [or-http-epoll-6] c.g.m.c.m.s.MovieCompositeIntegration : Will call the Health API on URL: http://movie/actuator/health
movie-composite_1 | 2020-02-11 18:03:07.253 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.4 : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
movie-composite_1 | 2020-02-11 18:03:07.253 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.4 : request(unbounded)
movie-composite_1 | 2020-02-11 18:03:07.256 INFO 1 --- [or-http-epoll-6] c.g.m.c.m.s.MovieCompositeIntegration : Will call the Health API on URL: http://recommendation/actuator/health
movie-composite_1 | 2020-02-11 18:03:07.257 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.5 : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
movie-composite_1 | 2020-02-11 18:03:07.257 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.5 : request(unbounded)
movie-composite_1 | 2020-02-11 18:03:07.260 INFO 1 --- [or-http-epoll-6] c.g.m.c.m.s.MovieCompositeIntegration : Will call the Health API on URL: http://review/actuator/health
movie-composite_1 | 2020-02-11 18:03:07.261 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.6 : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
movie-composite_1 | 2020-02-11 18:03:07.261 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.6 : request(unbounded)
movie-composite_1 | 2020-02-11 18:03:07.265 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.4 : onNext(DOWN error=io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: movie/172.21.0.8:80)
movie-composite_1 | 2020-02-11 18:03:07.266 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.4 : onComplete()
movie-composite_1 | 2020-02-11 18:03:07.266 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.5 : onNext(DOWN error=io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: recommendation/172.21.0.6:80)
movie-composite_1 | 2020-02-11 18:03:07.266 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.5 : onComplete()
movie-composite_1 | 2020-02-11 18:03:07.267 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.6 : onNext(DOWN error=io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: review/172.21.0.9:80)
movie-composite_1 | 2020-02-11 18:03:07.273 INFO 1 --- [or-http-epoll-6] reactor.Mono.OnErrorResume.6 : onComplete()
你能给我任何提示吗？ 所有测试都通过了，并且 mvn clean install 也成功了。
【问题讨论】：
【参考方案1】：查看您的docker ps 结果，似乎movie 服务正在侦听端口8080。
在这种情况下，您需要通过http://movie:8080/actuator/health 联系该服务。其他服务也一样！
说明：
每个容器都可以监听它希望的任何端口，而不会干扰其他容器或主机。例如，电影和评论服务都可以监听 8080 端口（与同一网络中的不同机器/VM 的行为类似） 为了让容器相互通信，它们需要在同一个网络中，并且其他容器需要在它们正在侦听的端口上到达它们，例如movie:8080 或 review:8080
但是，您将无法直接从主机访问这些端口上的容器，因为您的本地主机和容器不在同一个网络中。为了进行通信，您需要执行一些调用端口映射的操作，例如在您的movie-composite 服务0.0.0.0:8080->8080/tcp 的情况下，您将容器正在侦听的端口8080 映射到您的端口8080本地主机。因此，您可以在浏览器http://localhost:8080/actuator/health 上打开此链接
【讨论】：
你好阮林福！这确实有效！你能给我更多的解释吗？我怎样才能摆脱这个 :8080 绑定？这被认为是不好的做法吗？以上是关于Spring Boot Actuator 显示微服务的状态关闭的主要内容，如果未能解决你的问题，请参考以下文章
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