Sentinel

image.png
image.png
image.png
image.png

安装Sentinel

  1. 去GitHub上找1.7.1版本
  2. 直接下载jar包
  3. 使用 java -jar 包名称启动

初始化演示工程

先启动nacos8848 和 sentinel8080
image.png

  1. 新建cloudalibaba-sentinel-service8401

  2. POM

    1. <dependency>
    2.         <groupId>com.alibaba.cloud</groupId>
    3.         <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    4.     </dependency>
    5.     <dependency>
    6.         <groupId>com.alibaba.csp</groupId>
    7.         <artifactId>sentinel-datasource-nacos</artifactId>
    8.     </dependency>
    9.     <dependency>
    10.         <groupId>com.alibaba.cloud</groupId>
    11.         <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    12.     </dependency>
    13.     <dependency>
    14.         <groupId>org.springframework.cloud</groupId>
    15.         <artifactId>spring-cloud-starter-openfeign</artifactId>
    16.     </dependency>

  3. YML ```yaml server: port: 8401 spring: application: name: cloudalibaba-sentinel-service cloud: nacos: discovery:

     # Nacos服务注册中心地址
 server-addr: localhost:8848

    sentinel: transport:

     # 配置Sentinel Dashboard地址
 dashboard: localhost:8080
 # 默认8719端口，假如被占用会自动从8719开始一次+1扫描，直至找到未被占用的端口
 port: 8719

management: endpoints: web: exposure: include: ‘*’


4. 主启动
```java
package com.cedric.springcloud.alibaba;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author Cedric
 * @date 2022/4/14
 */
@SpringBootApplication
@EnableDiscoveryClient
public class MainApp8401 {

    public static void main(String[] args) {
        SpringApplication.run(MainApp8401.class, args);
    }
}
  1. Controller ```java package com.cedric.springcloud.alibaba.controller;

import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;

/**

  • @author Cedric

  • @date 2022/4/14 */ @RestController public class FlowLimitController {

    @GetMapping(“/testA”) public String testA() {

     return "test-----A";

    }

    @GetMapping(“/testB”) public String testB() {

     return "test-----B";

    } } ```

  1. 测试

image.png

流控规则

基本介绍

image.png image.png
image.png

流控模式

直接