SpringCloud Alibaba Sentinel实现熔断和限流(简介+安装+demo)

2021/8/23 0:00:21

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一、Sentinel简介

1、官网

http://github.com/alibaba/Sentinel

中文文档:https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D


2、是什么?

一句话总结来说:升级版的Hystrix


3、下载地址

http://github.com/alibaba/Sentinel/releases


4、能干嘛

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5、怎么玩

官网教你如何使用Sentinel

https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel


6、Sentinel和Hystrix的对比

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二、安装Sentinel控制台

1、Sentinel分为两个部分

核心库(JAVA客户端)不依赖任何框架/库,能够运行于所有java运行时环境,同时对Dubbo,Spring Cloud框架也有较好的支持

控制台(Dashboard)基于SpringBoot开发打包后直接运行,不需要Tomcat等应用


2、安装

1)下载 Sentinel-dashboard

https://github.com/alibaba/Sentinel/releases

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2)运行命令 : java -jar sentinel-dashboard-1.7.0.jar


3)访问sentinel管理界面

localhost:8080

登录账号密码均为 sentinel

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三、演示工程整合Sentinel

1、启动Nacos8848


2、新建module cloudalibaba-sentinel-service8401 整合Sentinel

1)新建module (maven工程)

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2)添加pom文件

<dependencies>
        <dependency><!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--SpringCloud ailibaba sentinel-datasource-nacos 后续做持久化用到-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        <!--SpringCloud ailibaba sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <!--openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!-- SpringBoot整合Web组件+actuator -->
        <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>
        <!--日常通用jar包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.6.3</version>
        </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>


3)添加yml文件

server:
  port: 8401

spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #Nacos服务注册中心地址
    sentinel:
      transport:
        dashboard: localhost:8080 #配置Sentinel dashboard地址
        #在应用对应的机器上启动一个 Http Server,该 Server 会与 Sentinel 控制台做交互
        port: 8719

management:
  endpoints:
    web:
      exposure:
        include: '*'


4)主启动类

@EnableDiscoveryClient
@SpringBootApplication
public class MainApp8401
{
    public static void main(String[] args) {
        SpringApplication.run(MainApp8401.class, args);
    }
}


5)controller

@RestController
public class TestController {

    @GetMapping("testA")
    public String getA(){
        return "test a";
    }

    @GetMapping("testB")
    public String getB(){
        return "test b";
    }
}


3、启动Sentinel8080


4、启动微服务8401


5、启动8401微服务后查看

此时要先发送一个请求: http://localhost:8401/testA

Sentinel控制台才能检测到该微服务

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