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:
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
<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=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
<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=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
@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 "8002" + id+name;
}
}
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
@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 "8003" + id+name;
}
}
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
Eureka2
Eureka3