[Sentinel 一]使用Sentinel实现接口限流

环境

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.2.5.RELEASE</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencyManagement>
	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-dependencies</artifactId>
			<version>Hoxton.SR3</version>
			<type>pom</type>
			<scope>import</scope>
		</dependency>
		<dependency>
			<groupId>com.alibaba.cloud</groupId>
			<artifactId>spring-cloud-alibaba-dependencies</artifactId>
			<version>2.2.1.RELEASE</version>
			<type>pom</type>
			<scope>import</scope>
		</dependency>
	</dependencies>
</dependencyManagement>

服务端 Sentinel-dashboard

1. 下载最新Sentinel-dashboard jar包

github.com/alibaba/Sen…

2. 运行jar包

java -jar sentinel-dashboard-1.7.1.jar -Dserver.port=8080 -Dcsp.sentinel.dashboard.server=localhost:8080 -Dproject.name=sentinel-dashboard

3. 浏览器访问
   http://localhost:8080
   默认账号密码sentinel/sentinel

   

客户端

引入依赖

<dependency>
   <groupId>com.alibaba.cloud</groupId>
   <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

1. postman 或 curl 调用下程序内接口，在 sentinel dashboard 中可以看到实时监控

2. 配置限流规则
   点击 簇点链路→选择接口→点击流控
   

   

如图配置，实现效果（限流策略）：每秒最多允许2个请求进入  
阈值类型：QPS  
单机阈值：2  

接口测试，快速调用第三次被sentinel限流