13如何使用断路器监控Hystrix Dashboard

Posted 2021-02-21

在微服务架构中如何去监控服务的状态是否正常，非常重要。为例保证微服务的可用性，防止程序断路器模型。运维人员需要一个友好的程序来监控微服务的状态， Hystrix Dashboard作为断路器监控的一个重要组件，提供了数据监控及非常友好的图形化界面，方便运维人员对服务进行监控；，通过界面反馈的信息可以快速发现系统中存在的问题。另外Hystrix Dashboard是一个独立的服务结点，不需要配置任何的注册中心。

1、新建项目sc-hystrix-dashboard，对用的pom.xml文件如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>spring-cloud</groupId>
    <artifactId>sc-hystrix-dashboard</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-hystrix-dashboard</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>

        <!-- <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
                <version>1.4.5.RELEASE</version>
        </dependency> -->

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

        <!-- <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-hystrix</artifactId>
                <version>1.4.5.RELEASE</version>
        </dependency> -->

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

    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    </dependencies>
</project>

说明：spring cloud 2.x之后spring-cloud-starter-hystrix-dashboard和spring-cloud-starter-hystrix都标志为过期，具体推荐使用两个依赖请看下面的图片

2、新建spring boot启动类DashboardApplication.java

package sc.hystrix.dashboard;

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

@SpringBootApplication
@EnableHystrixDashboard
public class DashboardApplication {

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

}

只需添加注解EnableHystrixDashboard，启动Hystrix Dashboard即可

3、配置Hystrix Dashboard对应的Servlet

package sc.hystrix.dashboard;

import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;

@Configuration
public class DashboardServletConfig {

    @Bean
    public ServletRegistrationBean getDashboardServlet(){

        HystrixMetricsStreamServlet servlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean bean = new ServletRegistrationBean(servlet);
        bean.setLoadOnStartup(1);
        bean.addUrlMappings("/hystrix.stream");
        bean.setName("hystrix");
        return bean;
    }

}

4、新建配置文件bootstrap.yml

spring:
    application:
        name: sc-hystrix-dashboard

server:
    port: 2001

5、启动并验证是否启动成功
方法一：查看日志配置的端口2001，在日志中标志启动成功

方法二：从上图标志的1中可以知道可以方法地址：http://127.0.0.1:2001/hystrix

6、分析一下下图中的英文

大概的意思是：如果查看默认集群使用第一个url，查看指定集群使用第二个url，单个应用监控使用最后一个

7、在url中输入http://127.0.0.1:2001/hystrix.stream

然后点击Monitor Stream按钮

或者访问http://localhost:2001/hystrix.stream也会不断的显示ping