一、准备工作
Eureka通过运行多个实例，使其更具有高可用性。事实上，这是它默认的熟性，你需要做的就是给对等的实例一个合法的关联serviceurl。
二、创建eureka-server
引入依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
添加配置信息
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://localhost:8762/eureka/,http://localhost:8763/eureka/
spring:
application:
name: eurka-server
运行主类
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
分别启动3个eureka-server实例，
第一步：启动以第1个eureka-server实例：
-Dserver.port=8761
配置信息修改如下：
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://localhost:8762/eureka/,http://localhost:8763/eureka/
spring:
application:
name: eurka-server
第一步：启动以第1个eureka-server实例：
-Dserver.port=8762
配置信息修改如下：
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://localhost:8761/eureka/,http://localhost:8763/eureka/
spring:
application:
name: eurka-server
第三步：启动以第1个eureka-server实例：
-Dserver.port=8763
配置信息修改如下：
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://localhost:8762/eureka/,http://localhost:8761/eureka/
spring:
application:
name: eurka-server
依次访问：localhost:8761、localhost:8761、localhost:8761
可以看到运行了3个eureka-serser实例
创建eureka-client工程
<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>
</dependency>
启动主类
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class ServiceHiApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceHiApplication.class, args);
}
}
配置文件
server:
port: 8765
spring:
application:
name: service-hi
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/,http://localhost:8763/eureka/
web访问
@RestController
public class HiController {
@Value("${server.port}")
private String port;
@GetMapping("/hi")
public String home(@RequestParam(value = "name", defaultValue = "gblfy") String name) {
return "hi," + name + ",i am from port" + port;
}
}
启动eureka-client，
再依次访问：localhost:8761、localhost:8761、localhost:8761
发现eureka-client已经成功注册到3个eureka-server服务端了，本次策略采取的是，eureka-server两两注册，就算其中一个宕机了，也不会影响服务的发现和注册。
当然eureka-client建议采用集群策略，以达到高可用
