Spring Cloud 入门教程(八)：断路器指标数据监控Hystrix Dashboard 和 Turbine

1. Hystrix Dashboard (断路器：hystrix 仪表盘)

Hystrix一个很重要的功能是，可以通过HystrixCommand收集相关数据指标. Hystrix Dashboard可以很高效的现实每个断路器的健康状况。

1）. 在Ribbon服务g和Feign服务的Maven工程的pom.xml中都加入依赖

1 <dependency>
2     <groupId>org.springframework.boot</groupId>
3     <artifactId>spring-boot-starter-actuator</artifactId>
4  </dependency>
5 <dependency>
6     <groupId>org.springframework.cloud</groupId>
7     <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
8 </dependency>

spring-boot-starter-actuator用于手机metric，支持hystrix.stream。spring-cloud-starter-hystrix-dashboard支持dashboard的UI

2）在Spring Boot启动类上用@EnableHystrixDashboard注解和@EnableCircuitBreaker注解。需要特别注意的是我们之前的Feign服务由于内置断路器支持，所以没有@EnableCircuitBreaker注解，但要使用Dashboard则必须加，如果不加，Dashboard无法接收到来自Feign内部断路器的监控数据，会报“Unable to connect to Command Metric Stream”错误

 1 @SpringBootApplication
 2 @EnableDiscoveryClient
 3 @EnableFeignClients
 4 @EnableCircuitBreaker
 5 @EnableHystrixDashboard
 6 public class ServiceFeignApplication {
 7 
 8     public static void main(String[] args) {
 9         SpringApplication.run(ServiceFeignApplication.class, args);
10     }
11 }

3）然后就可以访问/hystrix，这个URL将dashboard指向定义在Hystrix客户端应用中的/hystrix.stream

在dashboard中输入服务的URL：点击 monitor后进入监控界面，访问我们之前创建的Ribbon服务localhost:8901/, 或者Feign服务localhost:8902/可以看到监控UI动态变化

2. 利用Turbine在一个Dashboard上监控多个流

以上例子只能监控一个，要同时监控多个流怎么办？答案是，可以单独做一个Turbine服务，专门监控所有断路器状态，从而掌握整个系统中所有微服务的状态。下面我们就来创建一个Turbine服务，来监控我们之前做的Feign服务和Ribbon服务

1）. 创建一个maven工程，在pox.xml添加以下依赖

 1         <dependency>
 2             <groupId>org.springframework.cloud</groupId>
 3             <artifactId>spring-cloud-starter-turbine</artifactId>
 4         </dependency>
 5         <dependency>
 6             <groupId>org.springframework.cloud</groupId>
 7             <artifactId>spring-cloud-netflix-turbine</artifactId>
 8         </dependency>
 9         <dependency>
10             <groupId>org.springframework.boot</groupId>
11             <artifactId>spring-boot-starter-actuator</artifactId>
12         </dependency>
13         <dependency>
14             <groupId>org.springframework.cloud</groupId>
15             <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
16         </dependency>

整个个pox.xml文件如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6     <groupId>cm.chry</groupId>
 7     <artifactId>spring.helloworld.turbine.service</artifactId>
 8     <version>0.0.1-SNAPSHOT</version>
 9     <name>spring.helloworld.turbine.service</name>
10     <description>Turbine service demo</description>
11     <parent>
12         <groupId>org.springframework.boot</groupId>
13         <artifactId>spring-boot-starter-parent</artifactId>
14         <version>1.5.3.RELEASE</version>
15         <relativePath/> <!-- lookup parent from repository -->
16     </parent>
17 
18     <properties>
19         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
20         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
21         <java.version>1.8</java.version>
22     </properties>
23 
24     <dependencies>
25         <dependency>
26             <groupId>org.springframework.cloud</groupId>
27             <artifactId>spring-cloud-starter-eureka</artifactId>
28         </dependency>
29         <dependency>
30             <groupId>org.springframework.boot</groupId>
31             <artifactId>spring-boot-starter-web</artifactId>
32         </dependency>
33         <dependency>
34             <groupId>org.springframework.cloud</groupId>
35             <artifactId>spring-cloud-starter-turbine</artifactId>
36         </dependency>
37         <dependency>
38             <groupId>org.springframework.cloud</groupId>
39             <artifactId>spring-cloud-netflix-turbine</artifactId>
40         </dependency>
41         <dependency>
42             <groupId>org.springframework.boot</groupId>
43             <artifactId>spring-boot-starter-actuator</artifactId>
44         </dependency>
45         <dependency>
46             <groupId>org.springframework.cloud</groupId>
47             <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
48         </dependency>
49         <dependency>
50             <groupId>org.springframework.boot</groupId>
51             <artifactId>spring-boot-starter-test</artifactId>
52             <scope>test</scope>
53         </dependency>
54     </dependencies>
55 
56     <dependencyManagement>
57         <dependencies>
58             <dependency>
59                 <groupId>org.springframework.cloud</groupId>
60                 <artifactId>spring-cloud-dependencies</artifactId>
61                 <version>Dalston.RC1</version>
62                 <type>pom</type>
63                 <scope>import</scope>
64             </dependency>
65         </dependencies>
66     </dependencyManagement>
67 
68     <build>
69         <plugins>
70             <plugin>
71                 <groupId>org.springframework.boot</groupId>
72                 <artifactId>spring-boot-maven-plugin</artifactId>
73             </plugin>
74         </plugins>
75     </build>
76 
77     <repositories>
78         <repository>
79             <id>spring-milestones</id>
80             <name>Spring Milestones</name>
81             <url>https://repo.spring.io/milestone</url>
82             <snapshots>
83                 <enabled>false</enabled>
84             </snapshots>
85         </repository>
86     </repositories>
87 </project>

2）. 创建Turbine Dashboard启动类:

用@EnableHystrixDashboard和@EnableTurbine修饰主类，分别用于支持Hystrix Dashboard和Turbine

 1 package spring.helloworld.turbine.service;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
 6 import org.springframework.cloud.netflix.turbine.EnableTurbine;
 7 
 8 @SpringBootApplication
 9 @EnableHystrixDashboard
10 @EnableTurbine
11 public class DashboardApplication {
12 
13     public static void main(String[] args) {
14         SpringApplication.run(DashboardApplication.class, args);
15     }
16 }

3). 在application.yml中配置turbine参数

 1 eureka:
 2     client:
 3         serviceUrl:
 4             defaultZone: http://localhost:8761/eureka/
 5 server:
 6     port: 8903
 7 spring:
 8     application:
 9         name: hystrix-dashboard-turbine
10 turbine:
11     appConfig: service-feign, service-ribbon
12     aggregator:
13         clusterConfig: default
14     clusterNameExpression: new String("default")

turbine.appConfig定义了要监控的服务，这里是我们在前面章节创建的service-feign和sercice-ribbon; aggregator.clusterConfig定义了聚合方式，此处为default.

turbine.appConfig ：配置Eureka中的serviceId列表，表明监控哪些服务

turbine.aggregator.clusterConfig ：指定聚合哪些集群，多个使用”,”分割，默认为default。可使用http://.../turbine.stream?cluster={clusterConfig之一}访问

turbine.clusterNameExpression ：指定集群名称，可以是三种类型的值

- 默认表达式为appName；此时turbine.aggregator.clusterConfig需要配置想要监控的应用名称；

- 当为default时，turbine.aggregator.clusterConfig可以不写，因为默认就是default；

- 当为metadata[‘cluster’]时，假设想要监控的应用配置了eureka.instance.metadata-map.cluster: ABC，则需要配置，同时turbine.aggregator.clusterConfig: ABC

4）. 依次启动eureka服务， 2个Helloworld服务， Feign服务，ribbon服务和刚创建turbine服务。从eureka服务中我们可以看到

5）通过Turbine服务访问HystrixDashborad， http:localhost:8903/hystrix

监控流的URL填http://localhost:8903/turbine.stream, 点击monitor stream, 进入监控页面，随便刷新下feign和ribbon服务（http://localhost:8902/hello和http://localhost:8901），可以看到监控页面的变化。如下图，两个服务的监控都会显示在dashboard上

Spring Cloud 入门教程(八)： 断路器指标数据监控Hystrix Dashboard 和 Turbine

Spring Cloud 入门教程(八)：断路器指标数据监控Hystrix Dashboard 和 Turbine