搭建springcloud注册中心eureka以及admin监控

写该篇文章的目的是为了以后搭建微服务的时候避免踩坑

要求：搭建一个eureka-server注册中心，再构建两个eureka-client注册上去，然后再搭建admin服务注册到注册中心。实现在admin后管页面可观察已注册上去的服务

前提：使用的springboot版本为 2.2.2.RELEASE；cloud版本为:Hoxton.SR6、springboot-admin版本为2.2.2

项目已上传云盘，获取地址：

链接：https://pan.baidu.com/s/10icCd2VvQuD0dbuWUa8bUw
提取码：asdf

一、搭建eureka-server注册中心

注意点有三个，分别是

1.pom导入依赖（下面是完整的pom文件） : springboot、eureka-server、spring cloud

<?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 https://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>2.2.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.zyy</groupId><artifactId>spring_boot_demo</artifactId><version>0.0.1-SNAPSHOT</version><name>spring_boot_demo</name><description>Demo project for Spring Boot</description><properties><java.version>8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><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-test</artifactId><scope>test</scope></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Hoxton.SR6</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></project>

2. application.yml文件：

server:port: 8001
eureka:instance:hostname: localhostclient:register-with-eureka: falsefetch-registry: falseservice-url:defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/server:eviction-interval-timer-in-ms: 5000 #清理间隔（单位毫秒， 默认是60*1000）eureka server提出服务不可用的时间窗enable-self-preservation: false #默认为true，设置为false，关闭自我保护#eureka server： 在运行期间会去统计心跳失败比例在15分钟之内是否低于85%renewal-percent-threshold: 0.85 #默认0.85  指定自我保护机制的开启阈值

3. 启动类：添加@EnableEurekaServer注解

package com.zyy.spring_boot_demo;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication
@EnableEurekaServer
public class SpringBootDemoApplication {public static void main(String[] args) {SpringApplication.run(SpringBootDemoApplication.class, args);}}

二、搭建eureka-client客户端，注册在eureka上面

1.pom文件(主要依赖)：

        <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><!-- 服务被spring admin监控需要下面依赖 --><dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-client</artifactId><version>2.2.2</version></dependency>

2.application.yml:

spring:application:name: zyy-client-one
server:port: 8002
eureka:client:service-url:defaultZone: http://localhost:8001/eureka
# 下面的配置作为spring admin使用      
management:# 开启所有监控终端endpoints:web:exposure:include: "*"endpoint:health:show-details: always

3. 启动类: 添加@EnableEurekaClient注解表示为eureka客户端

package com.zyy.myeurekaclient;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableEurekaClient
public class MyeurekaclientApplication {public static void main(String[] args) {SpringApplication.run(MyeurekaclientApplication.class, args);}}

三、搭建admin-server服务，同时注册在eureka上面

1.pom文件（完整的）：导入依赖为springboot,spring-security,spring-actuator,eureka-client,springcloud

<?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 https://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>2.2.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.zyy</groupId><artifactId>myadmin</artifactId><version>0.0.1-SNAPSHOT</version><name>myadmin</name><description>Demo project for Spring Boot</description><properties><java.version>8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- security作为登录admin需要的账户密码 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><!-- 暴露端口，用于检查服务 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><!-- 标明是spring admin 服务 --><dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-server</artifactId><version>2.2.2</version></dependency><!-- 注册到eureka上面 --><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-test</artifactId><scope>test</scope></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Hoxton.SR6</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></project>

2. application.yml

spring:# 设置登录admin的账户密码  admin后台地址为 http://localhost:8004security:user:name: adminpassword: adminapplication:name: zyy-client-adminserver
server:port: 8004
eureka:client:service-url:defaultZone: http://localhost:8001/eurekaregistry-fetch-interval-seconds: 10management:# 开启所有监控终端endpoints:web:exposure:include: "*"endpoint:health:show-details: always

3. 启动类: 添加@EnableAdminServer 注解以及 @EnableEurekaClient注解

package com.zyy.myadmin;import de.codecentric.boot.admin.server.config.EnableAdminServer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableAdminServer
@EnableEurekaClient
public class MyadminApplication {public static void main(String[] args) {SpringApplication.run(MyadminApplication.class, args);}}

四、效果展示

启动euereka-server后，再启动其他服务，spring-admin也是作为eureka客户端注册在eureka注册中心。那admin后台能监控到注册中心上面的其他服务的原因是：

1. 服务都注册在注册中心上，admin可以获取注册中心上面的服务

2. eureka-client服务的pom都导入了下面的依赖，其被标注为一个admin 客户端，服务启动后能够被admin服务端监控。

<dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-client</artifactId><version>2.2.2</version>
</dependency>

访问 http://localhost:8001

访问 http://localhost:8004/

输入账号密码 admin

五、其他问题

本次是简单地搭建了eureka注册中心和 admin服务监控，没有涉及到业务逻辑，也比较简单。若按照教程出现问题，请确认maven依赖是否正确，版本号。