Spring Cloud（十二）：服务监控hystrixDashboard

偏执的太偏执、 2022-11-12 01:37 245阅读 0赞

## 1. 概述 ##

除了隔离依赖服务的调用之外，Hystrix还提供了准实时的调用监控（Hystrix Dashboard），Hystrix会持续的记录所有通过Hystrix发起的请求的执行信息，并以统计报表和图形的形式展示给用户，包括每秒执行多少请求多少成功，多少失败等，Netflix通过 Hystrix-metrics-event-stream项目实现了对以上指标的监控。Spring Cloud 也提供了Hystrix Dashboard 的整合，对监控内容转化成可视化界面。

## 2. 实战 ##

### 2.1 建 module ###

新建cloud-consumer-hystrix-dashboard9001

### 2.2 pom ###

<?xml version="1.0" encoding="UTF-8"?>
    <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">
        <parent>
            <artifactId>spring-cloud-demo</artifactId>
            <groupId>com.lele.springcloud</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloud-consumer-hystrix-dashboard9001</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    </project>

### 2.3 yml ###

server:
      port: 9001

### 2.4 启动类 ###

package com.lele.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
    
    /**
     * @author: lele
     * @date: 2021/3/21 17:23
     * @description:
     */
    @SpringBootApplication
    @EnableHystrixDashboard
    public class HystrixDashboardMain9001 {
        
        public static void main(String[] args) {
        
            SpringApplication.run(HystrixDashboardMain9001.class, args);
        }
    }

所有Provider微服务提供类（8001/8002/8003）都需要监控依赖配置

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

启动cloud-consumer-hystrix-dashboard9001该微服务后续将监控微服务8001

访问：http://localhost:9001/hystrix  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70]

### 2.5 断路器演示 ###

*  修改 cloud-provider-hystrix-payment8001

注意：新版本Hystrix需要在主启动类MainAppHystrix8001中指定监控路径  
Unable to connect to Command Metric Stream

package com.lele.springcloud;
    
    import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.context.annotation.Bean;
    
    /**
     * @author: lele
     * @date: 2021/3/20 13:50
     * @description:
     */
    @SpringBootApplication
    @EnableEurekaClient
    @EnableCircuitBreaker
    public class PaymentHystrixMain8001 {
        
        public static void main(String[] args) {
        
            SpringApplication.run(PaymentHystrixMain8001.class, args);
        }
    
        /**
         * 此配置是为了服务监控而配置，与服务容器本身无关，spring cloud升级后的坑
         * ServletRegistrationBean 因为spring boot 的默认路径不是 "/hystrix.stream"，
         * 只要在自己的项目里配置上下面的servlet就可以了
         */
        @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;
        }
    }

监控测试

启动1个eureka或者3个eureka集群均可  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 1]  
测试正确地址：  
http://localhost:8001/payment/circuit/1  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 2]

测试错误地址：  
http://localhost:8001/payment/circuit/-2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 3]

实心圆：有两种含义。它可以通过颜色的变化代表了实例的健康程度，它的健康度从绿色<黄色<橙色<红色递减

该实心圆除了颜色的变化之外，它的大小也会根据实例的请求流量发生变化，流量越大该实心圆就越大，所以通过实心圆的展示，就可以在大量的实例中快速的发现故障实例和高压力实例

1线：  
曲线：用来记录2分钟内流量的相对变化，可以通过它来观察到流量的上升和下降趋势

整图说明：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXdhbmxl_size_16_color_FFFFFF_t_70 6]  
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