preface

Spring Cloud was used in this paper as 2.1.8RELEASE, version=Greenwich.SR3

This article is based on the implementation of eureka-Server, Eureka-Client, Eureka-Ribbon and Eureka-Feign in the previous two articles. reference

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

concept

Hystrix Dashboard A control panel provided by Hystrix to view Hystrix monitoring data. Hystrix provides near real-time data monitoring. Hystrix records all HystrixCommand execution information in real time, including how many requests are executed per second, how many successes and failures.

Create the Hystrix Dashboard project

1.1 Creating a SPING Boot project: hysteric-Dashboard

1.2 Adding pom.xml dependencies

<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>
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1.3 Application Adds configuration information

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/
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1.4 to start the class HystrixDashboardApplication add annotations

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); }}Copy the code

EnableHystrixDashboard: Enable the HystrixDashboard circuit breaker kanban configuration

1.5 Starting the Hystrix-Dashboard service

Open a browser, type http://localhost:8500/hystrix shows the result is as follows:

Url input box: represents the service consumer to monitor

Single Hystrix App: https://hystrix-app:port/actuator/hystrix.stream: to monitor the path url format

1.6 Monitoring the Ribbon Service

1.6.1 Eureka-Ribbon Added Hystrix 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: the 2019-09-17 * /
@Configuration
public class HystrixConfig {

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

Start eureka-Client and Eureka-Ribbon services. Then enter the following in the URL box of the Hystrix Dashboard control panel:

Clicking Monitor Stream displays:

  • Unable to connect to Command Metric Stream Cause: Because we open the monitor circuit breaker flow Hystrix Stream path http://localhost:8901/hystrix.stream not spring boot the default path, also is not the default path Hystrix, All indicator flow servlets that want to add Hystrixconfig to specify circuit breakers.

  • Loading may also be displayed on the page after the first successful startup, which means that the service we want to monitor has not been accessed. In this way, we can see the indicator data when we request the service to be accessed for several times

In the same way I can set up the Eureka-Feign configuration for monitoring.

conclusion

This paper simply set up Hystrix Dashborad data monitoring platform.

Hystrix has stopped development and is in the maintenance stage. Hystrix has explained it on Github, suggesting us to use Resilience4J. The simplicity of Resilience4J will be updated later.

The code address

Making the address

  • Eureka Server Service Registry tutorial for Spring Cloud 2.x
  • Eureka Client Service Provider tutorial for Spring Cloud 2.x
  • Spring Cloud 2.x Ribbon Service Discovery Tutorial (with Integrated Hystrix Fuse)
  • Feign Service Discovery Tutorial with Integrated Hystrix Circuit breaker in Spring Cloud 2.x
  • Spring Cloud 2.x Zuul Routing Gateway Tutorial
  • Spring Cloud 2.x Config Distributed Configuration Center tutorial
  • Spring Cloud 2.x Hystrix Dashboard Circuit breaker tutorial

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