eureka快速入門--單機與集羣的搭建

eureka單機搭建

搭建eureka server

創建一個springboot項目

1.pom中添加依賴

		<!--端點監控工具依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--eureka server依賴-->
        <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>

2.啓動類中添加@EnableEurekaServer註解

在配置文件中配置基本項

server:
  port: 9001

eureka:
  ## 配置實例名稱
  instance:
    hostname: dev
  client:
    ## 檢索服務 是否從Eureka Server獲取註冊信息，默認爲true
    fetch-registry: false
    ## 是否註冊到eureka上
    register-with-eureka: false
    ## 定義service-url, 默認值爲 http://localhost:8761/eureka/
    service-url:
      defaultZone: http://localhost:${server.port}/eureka/
  server:
    ## 當eureka啓動時，不能從集羣節點中獲取到instance註冊信息，應該等待的時間
    wait-time-in-ms-when-sync-empty: 0
    ## 是否開啓自我保護機制
    enable-self-preservation: true
    ### eureka多長時間更新一次數據
    peer-eureka-nodes-update-interval-ms: 100000

啓動項目，訪問端口:
http://localhost:9001/

可以看到已經啓動完畢

搭建eureka client

1.導入依賴

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<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>
			<version>2.1.3.RELEASE</version>
		</dependency>

啓動類加上註解@EnableEurekaClient

配置文件中配置基本項

server:
  port: 9000
spring:
  application:
    name: eureka-client
eureka:
  client:
    service-url:
      ## 註冊地址
      defaultZone: http://localhost:9001/eureka/

訪問之前搭建的註冊中心

可以看到，我們的 eureka-client 註冊上去了

在eurekaClient端創建一個api接口,試試能否正常使用

@RestController
public class HelloEurekaDemo {

    @Value("${server.port}")
    private String port;

    @GetMapping("/hello")
    public String helloEureka (){
        return "hello Eureka ==> port: " + port;
    }

}

訪問http://localhost:9000/hello，瀏覽器現實如下信息：

至此單機的 eureka-client搭建完畢，已經可以初步使用了

eureka集羣搭建

1. eureka-server集羣基本配置

spring:
  profiles:
    active: dev2

---
spring:
  application:
    ###當前服務名
    name: eureka-peer
  profiles: dev

server:
  ##端口號
  port: 10000

---
spring:
  profiles: dev1
  application:
    name: eureka-peer2
server:
  port: 10001


---
spring:
   profiles: dev2
   application:
     name: eureka-peer3
server:
  port: 10002

---
eureka:
  instance:
    hostname: dev1
  client:
    ##是否從Eureka Server獲取註冊信息，默認爲true
    fetch-registry: false
    ##是否將自己註冊到eureka
    register-with-eureka: false
    ##客戶端默認去這個地址找註冊中心
    service-url:
      defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/
  server:
    ### 當eureka啓動時，不能從集羣節點中獲取到instance註冊信息，應該等多久
    wait-time-in-ms-when-sync-empty: 0
    enable-self-preservation: true
    ###eureka多長時間更新一次數據
    peer-eureka-nodes-update-interval-ms: 100000

分別啓動三個集羣服務

啓動成功後,訪問3個端口:
http://localhost:10000/
http://localhost:10001/
http://localhost:10002/

都可以正常訪問

2. eureka-client集羣基本配置

只需要將多個註冊的地址按,分隔即可

...
eureka:
  client:
    service-url:
      ## 集羣註冊地址 用,號隔開
      defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/

訪問api接口,正常

關閉2個server服務

依然能正常訪問

代碼鏈接:
碼雲.