快速搭建Eureka注册中心

一、步骤

1、创建 SpringBoot 项目

引入starter：

• Spring Web
• Eureka Server
  

2、在项目的主启动类上添加注解 @EnableEurekaServer

@EnableEurekaServer @SpringBootApplication public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication.class, args); } } 

3、增加 Eureka 配置

# 基本配置,应用名称
spring.application.name=eureka-server

# Eureka Server 配置
# 服务端口
server.port=8761 eureka.instance.hostname=localhost
eureka.client.registerWithEureka=false eureka.client.fetchRegistry=false # 注册中心地址，client 向这个地址进行注册服务
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/ 

4、运行注册中心

在IDEA中直接运行，或者直接用 java -jar 命令运行。


注：在本地运行多个 Eureka 注册中心，需要改变服务运行端口
java -jar -Dserver.port=xxxx

5、验证注册中心是否启动

访问：localhost:8761，如果成功启动会跳转到 Eureka 注册中心页面。

二、Eureka client 配置

1、引入依赖 starter

• Eureka Discovery Client
• Spring Web

2、@EnableDiscoveryClient

在需要注册的 Client 的启动类上添加注解 @EnableDiscoveryClient

@SpringBootApplication @EnableDiscoveryClient public class EurekaClientTestApplication { public static void main(String[] args) { SpringApplication.run(EurekaClientTestApplication.class, args); } } 

3、添加 Eureka 配置

在配置文件 application.properties 中添加：

# 应用名称
spring.application.name=eureka-client-test

# Eureka client 配置
# Client 服务地址
server.port=1234 # 注册中心地址
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/ 

4、查看服务是否注册成功

• 进入 Eureka 配置中心：http://localhost:8761
• 可以发现 服务 EUREKA-CLIENT-TEST 已经注册成功，可以从下面看到该服务的名称，IP地址和端口号以及服务的数量。

Instances currently registered with Eureka

Application	AMIs	Availability Zones	Status
EUREKA-CLIENT-TEST	n/a (1)	(1)	UP (1) - 192.168.43.17:eureka-client-test:1234
HELLOCLIENT	n/a (1)	(1)	UP (1) - 192.168.43.17:HelloClient:7211
HELLOSERVER	n/a (2)	(2)	UP (2) - 192.168.43.17:HelloServer:7111 , 192.168.43.17:HelloServer:7011

如果有下面的报错信息，则表明Eureka 注册中心没有启动，或者注册中心地址输入错误。

com.netflix.discovery.shared.transport.TransportException: There is no known eureka server; cluster server list is empty
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:108) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:873) ~[eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.25.jar:1.9.25] at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.25.jar:1.9.25] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_251] at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_251] at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_251] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_251] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_251] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_251] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_251] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_251] 

三、参考

[1] Eureka 官方wiki
[2] Spring Cloud Netflix DOC

本文地址：https://blog.csdn.net/IMBA_09/article/details/108034836