SpringCloud---SpringCloud Eureka(三)

亦凉 2023-07-11 11:20 11阅读 0赞

**搭建高可用的Eureka集群：**

**       只有一个Eureka注册中心的系统环境，如果这个Eureka挂掉，导致整个系统瘫痪，不能用。可以搭建Eureka集群，即使其中一个Eureka节点挂掉，其他Eureka节点依然能够工作，就保证了系统正常运行。**

**原理图：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70][]

**在本机hosts配置文件配置域名，即模拟三台服务器**

127.0.0.1  eureka7001.com
    127.0.0.1  eureka7002.com
    127.0.0.1  eureka7003.com

**3个Eureka中心：**

**Eureka1  module：**

**         pom.xml导入Eureka服务端坐标和web坐标**

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
     <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka-server</artifactId>
     </dependency>

**    application.properties**

server.port=7001
    
    eureka.client.register-with-eureka=false
    eureka.client.fetch-registry=false
    eureka.client.service-url.defaultZone=http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/

**启动类**

@SpringBootApplication
    @EnableEurekaServer
    public class Eureka7001 {
    	public static void main(String[] args) {
    		SpringApplication.run(Eureka7001.class, args);
    	}
    }

**Eureka2  module：**

**pom.xml导入Eureka服务端坐标和web坐标**

**     application.properties**

server.port=7002
    
    eureka.client.register-with-eureka=false
    eureka.client.fetch-registry=false
    eureka.client.service-url.defaultZone=http://eureka7001.com:7001/eureka/,http://eureka7003.com:7003/eureka/

**         启动类**

@SpringBootApplication
    @EnableEurekaServer
    public class Eureka7002 {
    	public static void main(String[] args) {
    		SpringApplication.run(Eureka7002.class, args);
    	}
    }

**Eureka3  module：**

**pom.xml导入Eureka服务端坐标和web坐标**

**     application.properties**

server.port=7003
    
    eureka.client.register-with-eureka=false
    eureka.client.fetch-registry=false
    eureka.client.service-url.defaultZone=http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

**启动类**

@SpringBootApplication
    @EnableEurekaServer
    public class Eureka7003 {
    	public static void main(String[] args) {
    		SpringApplication.run(Eureka7003.class, args);
    	}
    }

**3个微服务实例：**

**Service1 module:**

**        pom.xml导入Eureka客户端坐标和web坐标**

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>

**         application.properties**

server.port=8001
    spring.application.name=service
    
    eureka.client.service-url.defaultZone=http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
    eureka.instance.instance-id=microservice-1
    eureka.instance.prefer-ip-address=true

**          Controller**

@Controller
    public class TestController {
    	@RequestMapping(value="/testcontroller.do/{id}/{name}",method=RequestMethod.GET)
    	@ResponseBody
    	public String test(@PathVariable("id") int id,@PathVariable("name") String name) {
    		return "8001" + id+name;
    	}
    }

**          启动类**

@SpringBootApplication
    @EnableEurekaClient
    public class App8001 {
    	public static void main(String[] args) {
    		SpringApplication.run(App8001.class, args);
    	}
    }

**Service2 module:**

**         pom.xml导入Eureka客户端坐标和web坐标**

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>

**          application.properties**``

server.port=8002
    spring.application.name=service
    
    eureka.client.service-url.defaultZone=http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
    eureka.instance.instance-id=microservice-2
    eureka.instance.prefer-ip-address=true

**           Controller**

**           启动类**

@SpringBootApplication
    @EnableEurekaClient
    public class App8002 {
    	public static void main(String[] args) {
    		SpringApplication.run(App8002.class, args);
    	}
    }

**Service3 module:**

**         pom.xml导入Eureka客户端坐标和web坐标**

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>

**         application.properties**

server.port=8003
    spring.application.name=service
    
    eureka.client.service-url.defaultZone=http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
    eureka.instance.instance-id=microservice-3
    eureka.instance.prefer-ip-address=true

**         Controller**

**        启动类**

@SpringBootApplication
    @EnableEurekaClient
    public class App8003 {
    	public static void main(String[] args) {
    		SpringApplication.run(App8003.class, args);
    	}
    }

**依次启动三个Eureka，再依次启动三个微服务实例，访问Eureka中心**

**       Eureka1**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 1][]

**       Eureka2**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 2][]

**       Eureka3**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 3][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200305131456386.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2020030515361735.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200305153643463.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200305153710670.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70