eureka快速入门--单机与集群的搭建

傷城~ 2023-07-03 12:12 8阅读 0赞

# eureka单机搭建 #

## 搭建eureka server ##

创建一个springboot项目

### 1.pom中添加依赖 ###

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

### 2.启动类中添加@EnableEurekaServer注解 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70]  
在配置文件中配置基本项

server:
      port: 9001
    
    eureka:
      ## 配置实例名称
      instance:
        hostname: dev
      client:
        ## 检索服务 是否从Eureka Server获取注册信息，默认为true
        fetch-registry: false
        ## 是否注册到eureka上
        register-with-eureka: false
        ## 定义service-url, 默认值为 http://localhost:8761/eureka/
        service-url:
          defaultZone: http://localhost:${server.port}/eureka/
      server:
        ## 当eureka启动时，不能从集群节点中获取到instance注册信息，应该等待的时间
        wait-time-in-ms-when-sync-empty: 0
        ## 是否开启自我保护机制
        enable-self-preservation: true
        ### eureka多长时间更新一次数据
        peer-eureka-nodes-update-interval-ms: 100000

启动项目，访问端口:  
http://localhost:9001/  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 1]  
可以看到已经启动完毕

## 搭建eureka client ##

### 1.导入依赖 ###

<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>

启动类加上注解@EnableEurekaClient  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 2]  
配置文件中配置基本项

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

访问之前搭建的注册中心

可以看到，我们的 eureka-client 注册上去了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 3]

在eurekaClient端创建一个api接口,试试能否正常使用

@RestController
    public class HelloEurekaDemo {
    
        @Value("${server.port}")
        private String port;
    
        @GetMapping("/hello")
        public String helloEureka (){
            return "hello Eureka ==> port: " + port;
        }
    
    }

访问http://localhost:9000/hello，浏览器现实如下信息：

![在这里插入图片描述][20191110161949972.png]  
至此单机的 eureka-client搭建完毕，已经可以初步使用了

# eureka集群搭建 #

## 1. eureka-server集群基本配置 ##

spring:
      profiles:
        active: dev2
    
    ---
    spring:
      application:
        ###当前服务名
        name: eureka-peer
      profiles: dev
    
    server:
      ##端口号
      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:
        ##是否从Eureka Server获取注册信息，默认为true
        fetch-registry: false
        ##是否将自己注册到eureka
        register-with-eureka: false
        ##客户端默认去这个地址找注册中心
        service-url:
          defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/
      server:
        ### 当eureka启动时，不能从集群节点中获取到instance注册信息，应该等多久
        wait-time-in-ms-when-sync-empty: 0
        enable-self-preservation: true
        ###eureka多长时间更新一次数据
        peer-eureka-nodes-update-interval-ms: 100000

分别启动三个集群服务  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 4]  
启动成功后,访问3个端口:  
http://localhost:10000/  
http://localhost:10001/  
http://localhost:10002/

都可以正常访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 5]

## 2. eureka-client集群基本配置 ##

只需要将多个注册的地址按,分隔即可

...
    eureka:
      client:
        service-url:
          ## 集群注册地址 用,号隔开
          defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/

访问api接口,正常  
![在这里插入图片描述][2020020616565694.png]  
关闭2个server服务  
![在这里插入图片描述][20200206165840365.png]  
依然能正常访问  
![在这里插入图片描述][20200206165852710.png]  
代码链接:  
[码云][Link 1].

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2019111015524125.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2020020616223642.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191110160842339.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200206163654607.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[20191110161949972.png]: https://img-blog.csdnimg.cn/20191110161949972.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200206164758944.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200206165019638.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1MTIy,size_16,color_FFFFFF,t_70
[2020020616565694.png]: https://img-blog.csdnimg.cn/2020020616565694.png
[20200206165840365.png]: https://img-blog.csdnimg.cn/20200206165840365.png
[20200206165852710.png]: https://img-blog.csdnimg.cn/20200206165852710.png
[Link 1]: https://gitee.com/mcwit/mcw_frame/tree/master/item/springcloud/day01_eureka