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

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>

pom.xml
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



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参考： http://projects.spring.io/spring-cloud/spring-cloud.html#_circuit_breaker_hystrix_dashboard http://blog.csdn.net/ityouknow/article/details/72625646