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spring cloud 2.x版本 Hystrix Dashboard断路器教程

前言

本文采用Spring cloud本文为2.1.8RELEASE，version=Greenwich.SR3

本文基于前两篇文章eureka-server、eureka-client、eureka-ribbon和eureka-feign的实现。

参考

eureka-server
eureka-client
eureka-ribbon
eureka-feign

概念

Hystrix Dashboard时Hystrix提供的一个可以查看hystrix监控数据的控制面板。Hystrix提供了近实时的数据监控，Hystrix会实时、累加的记录所有关于HystrixCommand的执行信息，包括每秒执行多少请求，多少成功和多少失败等。

创建Hystrix Dashboard工程

1.1 创建sping boot工程：hysteric-dashboard

1.2 添加pom.xml相关依赖

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<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>
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
</dependency>

1.3 application添加配置信息

spring:
  application:
    name: hystrix-dashboard
server:
  port: 8500

eureka:
  instance:
    hostname: localhost
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10
  client:
    service-url:
      defaultZone: http://eureka1.server.com:8701/eureka/,http://eureka2.server.com:8702/eureka/,http://eureka3.server.com:8703/eureka/

1.4 启动类HystrixDashboardApplication增加注解

package spring.cloud.demo.hystrixdashboard;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

@EnableHystrixDashboard
@EnableDiscoveryClient
@SpringBootApplication
public class HystrixDashboardApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardApplication.class, args);
    }

}

@EnableHystrixDashboard：启动Hystrix Dashboard断路器看板相关配置

1.5 启动hystrix-dashboard服务

打开浏览器，输入 http://localhost :8500/hystrix显示结果如下：

spring cloud 2.x版本 Hystrix Dashboard断路器教程

url输入框：代表要监控的服务消费者

Single Hystrix App: https://hystrix-app :port/actuator/hystrix.stream：要监控路径url格式

1.6 监控ribbon服务

1.6.1 eureka-ribbon增加Hystrix的Configuration

package spring.cloud.demo.eurekaribbon.config;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @auther: maomao
 * @DateT: 2019-09-17
 */
@Configuration
public class HystrixConfig {

    @Bean
    public ServletRegistrationBean getServlet() {
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

启动eureka-client和eureka-ribbon服务。然后在hystrix dashboard控制面板url框中输入：

spring cloud 2.x版本 Hystrix Dashboard断路器教程

点击Monitor Stream会显示：

spring cloud 2.x版本 Hystrix Dashboard断路器教程

Unable to connect to Command Metric Stream问题原因：因为我们开启监控的断路器流Hystrix Stream路径 http://localhost :8901/hystrix.stream不是spring boot的默认路径，也不是hystrix的默认路径，所有要增加Hystrixconfig来制定断路器的指标流Servlet。
首次成功启动页面也有可能会显示loading，这代表还没有访问我们要监控的服务，这是我们可以多次请求要访问的服务就可以看到指标数据

按照同样的方式我可以设置eureka-feign的配置来进行监看。