【SpringBoot】【服务注册中心】eureka，从单机到集群

客官°小女子只卖身不卖艺 2022-11-25 05:29 156阅读 0赞

### **eureka单机：** ###

**一、什么是服务注册与发现：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70][]

**二、eureka的两个组件：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 1][]

**三、eureka的搭建：**

> ** 创建模块——引入依赖——给启动类加@EnableEurekaServer注解——编写application.yml**
> 
> ![20200807172310172.png][]
> 
>  （版本由父项目控制）
> 
>     <dependency>
>                 <groupId>org.springframework.cloud</groupId>
>                 <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
>             </dependency>
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 2][]
> 
>     server:
>       port: 7001
>     
>     spring:
>       application:
>         name: eureka-server
>     
>     eureka:
>       instance:
>         hostname: localhost
>         instance-id: eureka-server7001  #为eureka绑定一个名称，集群时eureka服务不能相同
>         prefer-ip-address: true #显示部署eureka的主机IP
>       client:
>         fetch-registry: false #是否从eureka获取信息
>         register-with-eureka: false #是否注册到eureka（自身是不需要注册到自己的）
>         service-url:
>           defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
> 
>  启动项目即可，访问地址： [http://localhost:7001/][http_localhost_7001]

** ** **四、eureka的注册：**

> **  引入依赖——给启动类加@EnableEurekaClient（或 @EnableDiscoveryClient）注解——编写application.yml.**
> 
>  
> 
> ** **（版本由父项目控制）
> 
>     <dependency>
>                 <groupId>org.springframework.cloud</groupId>
>                 <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
>             </dependency>
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 3][]
> 
>  ![20200807173729433.png][]
> 
>  .
> 
>

** 五、使用RestTemplate 调用服务：**

> 注入 **RestTemplate** 并开启负载均衡**：**![20200807212528292.png][]
> 
> ** **通过服务名调用提供者服务**：**
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 4][]
> 
>

### ** eureka集群：** ###

**原理：互相注册，相互守望**

**一篇通读：** [https://www.jianshu.com/p/9c6fe9ca1d34][https_www.jianshu.com_p_9c6fe9ca1d34]

** **

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70]: /images/20221124/a67adf8f2de543b180a5e640f472e34b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 1]: /images/20221124/3596898452684d5ba4f121430965edca.png
[20200807172310172.png]: /images/20221124/33289f60ff5d4fd2bb450315d27e7310.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 2]: /images/20221124/60340e0d5b40402a89121649ca855399.png
[http_localhost_7001]: http://localhost:7001/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 3]: /images/20221124/ca784e3513c84da9a7e54036b315ea22.png
[20200807173729433.png]: /images/20221124/130f07ee777743b39aedc24c9f117be7.png
[20200807212528292.png]: /images/20221124/3387038774b7485489c31296872073fc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RpbWVndXlz_size_16_color_FFFFFF_t_70 4]: /images/20221124/8c9f6e2b150548a2925caa952c1a56a8.png
[https_www.jianshu.com_p_9c6fe9ca1d34]: https://www.jianshu.com/p/9c6fe9ca1d34