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
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix-dashboard</artifactId></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
@SpringBootApplication@EnableDiscoveryClient@EnableFeignClients@EnableCircuitBreaker@EnableHystrixDashboardpublic class ServiceFeignApplication {public static void main(String[] args) {SpringApplication.run(ServiceFeignApplication.class, args);}}
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
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-turbine</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-netflix-turbine</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix-dashboard</artifactId></dependency>
整个个pox.xml文件如下:
<?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"><modelVersion>4.0.0</modelVersion><groupId>cm.chry</groupId><artifactId>spring.helloworld.turbine.service</artifactId><version>0.0.1-SNAPSHOT</version><name>spring.helloworld.turbine.service</name><description>Turbine service demo</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.3.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</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-turbine</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-netflix-turbine</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix-dashboard</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Dalston.RC1</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build><repositories><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories></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
package spring.helloworld.turbine.service;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;import org.springframework.cloud.netflix.turbine.EnableTurbine;@SpringBootApplication@EnableHystrixDashboard@EnableTurbinepublic class DashboardApplication {public static void main(String[] args) {SpringApplication.run(DashboardApplication.class, args);}}
3). 在application.yml中配置turbine参数
eureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/server:port: 8903spring:application:name: hystrix-dashboard-turbineturbine:appConfig: service-feign, service-ribbonaggregator:clusterConfig: defaultclusterNameExpression: 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