微服务：整合 Spring Boot Admin - 集成Eureka注册中心

一、前言

　　通过前面的学习，虽然我们已经可以在 Spring Boot Admin 中查看应用中 Actuator 的监控信息了，但是这种方式有一点不好的地方，就是每个被监控的服务都必须配置 Spring Boot Admin 的地址，还得引入依赖。为了解决这一问题我们通过Eureka注册中心来解耦这一复杂的问题。
　　本节我们将 Spring Boot Admin 也注册到 Eureka 中，然后自动获取 Eureka 中注册的服务信息来统一查看。

二、代码演示

1、首先修改microservice-provider -> pom.xml

<?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">
    <parent>
        <artifactId>microservice-minitor</artifactId>
        <groupId>com.microservice</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservice-provider</artifactId>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

<!--        <dependency>-->
<!--            <groupId>de.codecentric</groupId>-->
<!--            <artifactId>spring-boot-admin-starter-client</artifactId>-->
<!--            <version>2.2.0</version>-->
<!--        </dependency>-->

    </dependencies>

</project>

2、修改microservice-provider -> application.yml

spring:
  application:
    name: microservice-provider
#  boot:
#    admin:
#      client:
#        url: http://localhost:8888
server:
  port: 8101

management:
  endpoints:
    web:
      exposure:
        include: '*'
  endpoint:
    health:
      show-details: ALWAYS

eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: true
    fetch-registry: true
    serviceUrl:
      defaultZone: http://localhost:8001/register/eureka/

3、修改 microservice-monitor-server -> pom.xml，添加Eureka客户端依赖：

<?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">
    <parent>
        <artifactId>microservice-minitor</artifactId>
        <groupId>com.microservice</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservice-monitor-server</artifactId>

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

        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>2.2.0</version>
        </dependency>

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

    </dependencies>

</project>

4、修改 microservice-monitor-server ->application.xml，添加Eureka客户端配置

server:
  port: 8888
spring:
  application:
    name: SpringBootAdmin
  boot:
    admin:
      ui:
        title: SpringBootAdmin-Server
        
eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: true
    fetch-registry: true
    serviceUrl:
      defaultZone: http://localhost:8001/register/eureka/

三、运行测试

1、Eureka 注册中心：

 

 Spring Boot Admin:

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四、总结

　　通过上面的示例，我们可以知道，我们只需要将Spring Boot Admin 注册到Eureka注册中心里面，那么 Spring Boot Admin就可以通过Eureka获取到每个微服务的地址以及actuator暴露出来的地址。Spring Boot Admin就可以监控每个微服务实例了。