Spring 启动微服务无法连接到 Eureka 服务器

Question

我尝试将我的服务 (auth-service) 连接到服务注册表的 Eureka 服务器。 Eureka 服务器是运行，但是当我尝试连接 auth-service 时没有任何反应。

我将配置添加到 application.yaml 和 application.properties，但没有任何帮助。

application.yaml 来自授权服务：

eureka:
      client:
        fetchRegistry: true
        registryFetchIntervalSeconds: 5
        serviceUrl:
          defaultZone: http://localhost:8761/eureka
      instance:
        preferIpAddress: true

Eureka 服务器的

URL：http://localhost:8761/

DS 副本：localhost

启动授权服务时的消息：

2019-05-24 16:58:11.457  INFO [auth-service,,,] 14704 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-05-24 16:58:13.293  INFO [auth-service,,,] 14704 --- [           main] o.s.cloud.commons.util.InetUtils         : Cannot determine local hostname
2019-05-24 16:58:14.521  INFO [auth-service,,,] 14704 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2019-05-24 16:58:14.524  INFO [auth-service,,,] 14704 --- [           main] d.h.authservice.AuthServiceApplication   : Started AuthServiceApplication in 11.448 seconds (JVM running for 12.63)

Eureka Server注解为@EnableEurekaServer，Client注解为@EnableDiscoveryClient

授权服务 pom:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>de.hspf</groupId>
<artifactId>auth-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>auth-service</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.2.5</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.0-api</artifactId>
        <version>1.0.1.Final</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.sendgrid</groupId>
        <artifactId>sendgrid-java</artifactId>
        <version>4.1.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.modelmapper</groupId>
        <artifactId>modelmapper</artifactId>
        <version>1.1.0</version>
    </dependency>
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf-spring3</artifactId>
        <version>3.0.8.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.xmlunit</groupId>
        <artifactId>xmlunit-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-sleuth-zipkin</artifactId>
        <version>2.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-netflix-eureka-client</artifactId>
        <version>2.0.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-starter</artifactId>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Finchley.M9</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

发现服务 pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>
<artifactId>discovery-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>discovery-server</name>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<dependencyManagement>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-dependencies</artifactId>

            <version>Finchley.M9</version>

            <type>pom</type>

            <scope>import</scope>

        </dependency>

    </dependencies>

</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>

Answer 1

在auth-service中缺少application.yaml：registerWithEureka: true

eureka:
      client:
        registerWithEureka: true
        fetchRegistry: true
        registryFetchIntervalSeconds: 5
        serviceUrl:
          defaultZone: http://localhost:8761/eureka
      instance:
        preferIpAddress: true

你只是把fetchRegistry: true，这个用来记录从服务端获取的客户端信息，用来寻找其他微服务，而不是注册客户端。

Answer 2

尝试将此依赖项用于客户端

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

而不是

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-netflix-eureka-client</artifactId>
    <version>2.0.1.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-starter</artifactId>
</dependency>

Answer 3

我也遇到了同样的问题。

我的尤里卡服务有效。

添加了尤里卡服务器依赖。

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
  </dependency>

在@SpringBootApplication 上添加了@EnableEurekaServer 注释。

@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaserverApplication.class, args);
        System.out.println("Eureka! It's working!");
    }
}

添加的应用程序属性：

server.port=8761.   
eureka.client.register-with-eureka=false eureka.client.fetch-registry=false

对于我的微服务：

添加了尤里卡发现客户端依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.2.5.RELEASE</version>
</dependency>

为@SpringBootApplication添加注解@EnableEurekaClient

@SpringBootApplication
@EnableEurekaClient
public class CouponApp {
    public static void main(String[] args) {
        SpringApplication.run(CouponApp.class, args);
        System.out.println("spring cloud works!");
    }
}

已添加application.properties

spring.application.name=coupon-service
eureka.client.service-url.defaultZone=http://localhost:8761/eureka

这是我的错误：

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

任何指示或我是否遗漏了一些配置？

Answer 4

默认设置应为：

server.port=8761

eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

logging.level.com.netflix.eureka=OFF
logging.level.com.netflix.discovery=OFF

按照官方网站的建议。另外，不要忘记在主文件中添加 @EnableEurekaServer 资料来源：https://spring.io/guides/gs/service-registration-and-discovery/

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