SpringCloud 周边服务学习

zipkin 链路追踪

越来越多的微服务存在，他们之间也会有更加复杂的调用关系。
这个调用关系，仅仅通过观察代码，会越来越难以识别，就需要通过 zipkin 服务链路追踪服务器这个东西来用图片进行识别各个服务的调用关系

启动zipkin-server
```
java -jar zipkin-server-2.10.1-exec.jar
```

pom.xml 为各个服务增加

    <!--zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

application.yml 为各个需要追踪的服务增加

spring:
  application:
    name: index-codes-service

#增加 zipkin 地址
  zipkin:
    base-url: http://localhost:9411

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: index-data-service
  zipkin:
    base-url: http://localhost:9411

Application增加 Sampler 的Bean

@SpringBootApplication
@EnableEurekaClient
@EnableCaching
public class IndexCodesApplication {
    public static void main(String[] args) {
         
    }
//增加Sampler的Bean
    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }
}

链路追踪地址

http://localhost:9411/zipkin/dependency/

配置服务器 ConfigServer

创建子模块index-config-server

pom.xml

<?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>trendParentProject</artifactId>
        <groupId>cn.how2j.trend</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
 
    <artifactId>index-config-server</artifactId>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
#spring-cloud-config-server 的依赖
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

    </dependencies>
</project>

启动类 Application 增加 @EnableConfigServer

@SpringBootApplication
@EnableConfigServer
@EnableDiscoveryClient
@EnableEurekaClient
public class IndexConfigServerApplication {
    public static void main(String[] args) {
        new SpringApplicationBuilder(IndexConfigServerApplication.class).properties("server.port=" + port).run(args);
    }
}

application.yml

spring:
  application:
    name: index-config-server
  cloud:
    config:
#label 表示 分支
      label: master
      server:
        git:
#uri 表示 git 地址：
          uri: https://github.com/how2j/trendConfig/
#searchPaths 表示目录
          searchPaths: respo
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

更改所需要配置的服务
pom.xml 添加对spring-cloud-starter-config 的依赖

<!--config-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

增加bootstrap.yml 把 eureka 地址信息移动到了 bootstrap.yml 里

bootstrap.yml 和 application.yml 的区别，简单说就是前者先启动，并且一些系统方面的配置需要在 bootstrap.yml 里进行配置

spring:
  cloud:
    config:
      label: master
      profile: dev
      discovery:
        enabled:  true
#提供了 serviceId: index-config-server, 这个是配置服务器在 eureka server 里的服务名称，这样就可以定位 config-server了
        serviceId:  index-config-server
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

增加注解 @Value("${version}")

@Controller
public class ViewController {
#增加了个注解来获取版本信息
    @Value("${version}")
    String version;
    @GetMapping("/")
    public String view(Model m) throws Exception {
        m.addAttribute("version", version);
        return "view";
    }
}

rabbitMQ 数据广播

服务业务逻辑
　　

1. 通过运行FreshConfigUtil类， 以 post 方式访问地址 http://localhost:8041/actuator/bus-refresh，通知 view:8041 刷新配置。

2. view:8041 告诉 index-config-server 获取新的配置数据

3. index-config-server 从 git 拿到数据，返回给 view:8041

4. view:8041 拿到数据不仅自己用了，还发给了 rabbitMQ

5. rabbitMQ 拿到这个数据广播给其他的，比如 view:8042

启动RabbitMQ

为view服务添加pom.xml

<artifactId>trend-trading-backtest-view</artifactId>
    <dependencies>
#用于访问路径：/actuator/bus-refresh， 这个地址就用来通知它去更新配置服务器
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
#多了spring-cloud-starter-bus-amqp 用于支持 rabbitmq
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
    </dependencies>

bootstrap.yml

spring:
  cloud:
    config:
      label: master
      profile: dev
      discovery:
        enabled:  true
        serviceId:  index-config-server
#新增 but总线配置
    bus:
      enabled: true
      trace:
        enabled: true
#新增 rabbitMQ 配置
rabbitmq:
  host: localhost
  port: 5672
  username: guest
  password: guest
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

application.yml

spring:
  application:
    name: trend-trading-backtest-view
  thymeleaf:
    mode: LEGACYHTML5
    encoding: UTF-8
    content-type: text/html
    cache: false
  zipkin:
    base-url: http://localhost:9411
#增加management
#其作用是允许访问：/actuator/bus-refresh
management:
  endpoints:
    web:
      exposure:
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*"

增加 rabbitMQ 端口判断。5672 是 rabbitMQ 服务器的端口， 15672 是 rabbitMQ 自带的某个web工具的端口

        int rabbitMQPort = 5672;
        if(NetUtil.isUsableLocalPort(rabbitMQPort)) {
            System.err.printf("检查到端口%d 未启用，判断 rabbitMQ 服务器没有启动，本服务无法使用，故退出%n", rabbitMQPort );
            System.exit(1);
        }

为view增加注解 @RefreshScope 表示允许刷新

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
  
@Controller
@RefreshScope
public class ViewController {
    @Value("${version}")
    String version;
    @GetMapping("/")
    public String view(Model m) throws Exception {
        m.addAttribute("version", version);
        return "view";
    }
}

post访问工具

import java.util.HashMap;  
import cn.hutool.http.HttpUtil;  
public class FreshConfigUtil {  
    public static void main(String[] args) {
        HashMap<String,String> headers =new HashMap<>();
        headers.put("Content-Type", "application/json; charset=utf-8");
        System.out.println("因为要去git获取，还要刷新index-config-server, 会比较卡，所以一般会要好几秒才能完成，请耐心等待");
  
        String result = HttpUtil.createPost("http://localhost:8041/actuator/bus-refresh").addHeaders(headers).execute().body();
        System.out.println("result:"+result);
        System.out.println("refresh 完成");
    }
}

对服务链路追踪的影响

因为视图服务进行了改造，支持了 rabbitMQ, 那么在默认情况下，它的信息就不会进入 Zipkin了。 在Zipkin 里看不到视图服务的资料了。
为了解决这个问题，在启动 Zipkin 的时候 带一个参数就好了：--zipkin.collector.rabbitmq.addresses=localhost

现在改成

java -jar zipkin-server-2.10.1-exec.jar --zipkin.collector.rabbitmq.addresses=localhost

断路器监控

新建子模块 index-hystrix-dashboard

pom.xml

<?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>trendParentProject</artifactId>
        <groupId>cn.how2j.trend</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
 
    <artifactId>index-hystrix-dashboard</artifactId>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-netflix-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>
 
    </dependencies>
 
</project>

断路器监控启动器 IndexHystrixDashboardApplication

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import cn.hutool.core.util.NetUtil;

@SpringBootApplication
//使用 @EnableHystrixDashboard 来启动断路器监控台
@EnableHystrixDashboard
public class IndexHystrixDashboardApplication {
    public static void main(String[] args) {
        int port = 8070;
        int eurekaServerPort = 8761;
        if(NetUtil.isUsableLocalPort(eurekaServerPort)) {
            System.err.printf("检查到端口%d 未启用，判断 eureka 服务器没有启动，本服务无法使用，故退出%n", eurekaServerPort );
            System.exit(1);
        }
        if(!NetUtil.isUsableLocalPort(port)) {
            System.err.printf("端口%d被占用了，无法启动%n", port );
            System.exit(1);
        }
        new SpringApplicationBuilder(IndexHystrixDashboardApplication.class).properties("server.port=" + port).run(args);
    }
}

application.yml

spring:
  application:
    name: index-hystrix-dashboard

对需要进行监控的服务进行修改
pom.xml 增加监控接口

<!--监控接口-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

为需要监控的服务的启动类增加注解: @EnableCircuitBreaker，用于把断路信息分享出来

@EnableCircuitBreaker
public class TrendTradingBackTestServiceApplication {
    public static void main(String[] args) {
         new SpringApplicationBuilder(TrendTradingBackTestServiceApplication.class).properties("server.port=" + port).run(args);
    }
}

更改需要监控的服务的application.yml

spring:
  application:
    name:  trend-trading-backtest-service
  zipkin:
    base-url: http://localhost:9411
feign.hystrix.enabled: true
#增加如下内容，使之可以访问
management:
  endpoints:
    web:
      exposure:
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*"

监控地址

http://localhost:8070/hystrix

输入参数

http://localhost:8051/actuator/hystrix.stream

posted @ 2020-10-17 11:26 Ideaway 阅读(95) 评论(0) 编辑收藏举报

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