1、Hystrix Dashboard
通过Hystrix Dashboard可以看到单个应用内的服务信息，本次使用到的应用包括：
- eureka-server：服务注册中心
- eureka-producer：服务提供者
- eureka-consumer-feign-hystrix：使用 Feign 和 Hystrix 实现的服务消费者
使用新的工程Hystrix Dashboard
（1）pom.xml
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.6.RELEASE
com.springcloud
hystrix-dashboard
0.0.1-SNAPSHOT
hystrix-dashboard
Demo project for Spring Boot
1.8
Greenwich.SR1
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.cloud
spring-cloud-starter-openfeign
org.springframework.cloud
spring-cloud-starter-netflix-hystrix
org.springframework.cloud
spring-cloud-starter-netflix-hystrix-dashboard
org.springframework.boot
spring-boot-starter-actuator
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
（2）application.yml
server:
port: 8093
spring:
application:
name: hystrix-dashboard
eureka:
server:
enable-self-preservation: false #关闭eureka的自我保护，防止已被关停的节点也错误的显示在线
client:
register-with-eureka: true #否允许客户端向Eureka 注册表获取信息，服务器为设置为false,客户端设置为true
fetch-registry: true #是否允许向Eureka Server注册信息 如果是服务器端，应该设置为false
service-url:
defaultZone: http://peer1:8761/eureka/ #此eureka server的应用注册地址
feign:
hystrix:
enabled: true
（3）HystrixDashboardApplication.java
@SpringBootApplication
@EnableHystrixDashboard
@EnableEurekaClient
@EnableFeignClients //这个注解是通知SpringBoot在启动的时候，扫描被 @FeignClient 修饰的类
public class HystrixDashboardApplication {
public static void main(String[] args) {
SpringApplication.run(HystrixDashboardApplication.class, args);
}
@Bean
public ServletRegistrationBean servletRegistrationBean() {
HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
registrationBean.setLoadOnStartup(1);
registrationBean.addUrlMappings("/hystrix.stream");
registrationBean.setName("HystrixMetricsStreamServlet");
return registrationBean;
}
}
（4）Controller和远程调用文件
@RestController
public class HelloController {
@Autowired
private HelloRemote helloRemote;
@RequestMapping("/hello")
public String hello(@RequestParam("name") String name) {
return helloRemote.hello(name);
}
@RequestMapping("/hello1")
public String hello1(@RequestParam("name") String name) {
return helloRemote.hello(name);
}
}
@FeignClient(name= "spring-cloud-producer",fallback = HelloRemoteFallback.class)
public interface HelloRemote {
@RequestMapping(value = "/hello")
String hello(@RequestParam(value = "name") String name);
}
@Component
public class HelloRemoteFallback implements HelloRemote {
@Override
public String hello(@RequestParam(value = "name") String name) {
return "hello " + name + "，i am fallback message";
}
}
启动eureka和hystrix-dashboard，访问http://localhost:8093/hystrix，在页面中间长文本框中输入http://localhost:8093/hystrix.stream，点击Monitor Stream，显示Loading ...，再访问http://localhost:8093/hello?name=1，可以看到生成如下图表
2、Turbine
引入Turbine来聚合Ribbon-consumer服务的监控信息，并输出给Hystrix Dashboard来进行展示。
创建一个新的工程turbine
（1）pom.xml
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.6.RELEASE
com.springcloud
turbine
0.0.1-SNAPSHOT
turbine
Demo project for Spring Boot
1.8
Greenwich.SR1
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.boot
spring-boot-starter-actuator
org.springframework.cloud
spring-cloud-starter-netflix-hystrix-dashboard
org.springframework.cloud
spring-cloud-starter-netflix-turbine
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
（2）application.yml
server:
port: 8094
spring:
application:
name: hystrix-dashboard-turbine
turbine:
app-config: consumer-node1,consumer-node2 #配置Eureka中的serviceId列表，表明监控哪些服务
aggregator:
cluster-config: default #指定聚合哪些集群，多个使用”,”分割，默认为default
cluster-name-expression: new String("default") #参数指定了集群名称为 default，当我们服务数量非常多的时候，可以启动多个 Turbine 服务来构建不同的聚合集群，而该参数可以用来区分这些不同的聚合集群，同时该参数值可以在 Hystrix 仪表盘中用来定位不同的聚合集群，只需要在 Hystrix Stream 的 URL 中通过 cluster 参数来指定
combine-host-port: true #参数设置为true，可以让同一主机上的服务通过主机名与端口号的组合来进行区分，默认情况下会以 host 来区分不同的服务，这会使得在本地调试的时候，本机上的不同服务聚合成一个服务来统计
eureka:
client:
service-url:
defaultZone: http://peer1:8761/eureka/
（3）TurbineApplication.java启动类
@SpringBootApplication
@EnableTurbine
@EnableHystrixDashboard
public class TurbineApplication {
public static void main(String[] args) {
SpringApplication.run(TurbineApplication.class, args);
}
}
创建消费者集群，按consumers项目的内容创建两个项目consumer-node1，consumer-node2
修改对应的应用名
spring:
application:
name: consumer-node1
增加依赖包
org.springframework.cloud
spring-cloud-starter-netflix-hystrix-dashboard
增加启动类注册
@Bean
public ServletRegistrationBean getServlet(){
HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
registrationBean.setLoadOnStartup(1);
registrationBean.addUrlMappings("/actuator/hystrix.stream");
registrationBean.setName("HystrixMetricsStreamServlet");
return registrationBean;
}
依次启动注册中心eureka，turbine和两个消费者，访问两个消费者，输入http://localhost:8094/hystrix， 会返回小熊界面，输入：http://localhost:8094/turbine.stream，然后点击 Monitor Stream ,可以看到出现了俩个监控列表