SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（11）-- SpringCloud Alibaba Sentinel实现熔断与限流

超、凢脫俗 2023-01-03 05:57 227阅读 0赞

## 上一篇：[SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（10）-- Linux版Nacos+MySQL生产环境配置][SpringCloud Hoxton_ _ SpringCloud alibaba_10_-- Linux_Nacos_MySQL] ##

### 一、Sentinel ###

#### 1、官网 ####

[https://github.com/alibaba/Sentinel][https_github.com_alibaba_Sentinel]  
中文：[https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D][https_github.com_alibaba_Sentinel_wiki_E4_BB_8B_E7_BB_8D]

#### 2、是什么 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70]

#### 3、去哪下 ####

[https://github.com/alibaba/Sentinel/releases][https_github.com_alibaba_Sentinel_releases]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 1]

#### 4、能干嘛 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 2]

#### 5、怎么玩 ####

[https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html\#\_spring\_cloud\_alibaba\_sentinel][https_spring-cloud-alibaba-group.github.io_github-pages_greenwich_spring-cloud-alibaba.html_spring_cloud_alibaba_sentinel]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 3]

### 二、安装Sentinel控制台 ###

sentinel组件由2部分组成  
![在这里插入图片描述][20210107202751648.png]  
后台+前台8080  
安装步骤：

#### 1、下载 ####

[https://github.com/alibaba/Sentinel/releases][https_github.com_alibaba_Sentinel_releases]  
下载到本地sentinel-dashboard-1.7.0.jar  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 4]

#### 2、运行命令 ####

![在这里插入图片描述][20210107203314115.png]

java -jar sentinel-dashboard-1.7.0.jar

#### 3、访问sentinel管理界面 ####

http://localhost:8080  
登录账号密码均为sentinel

### 三、初始化演示工程 ###

#### 1、启动Nacos8848成功 ####

http://localhost:8848/nacos/\#/login

#### 2、Module ####

##### ①、cloudalibaba-sentinel-service8401 #####

##### ②、POM #####

<?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>cloud2020</artifactId>
            <groupId>com.atguigu.springcloud</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloudalibaba-sentinel-service8401</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>com.atguigu.springcloud</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.csp</groupId>
                <artifactId>sentinel-datasource-nacos</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</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.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>
    
    </project>

##### ③、YML #####

server:
      port: 8401
    
    spring:
      application:
        name: cloudalibaba-sentinel-service
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848
        sentinel:
          transport:
            dashboard: localhost:8080
            port: 8719 #默认8719，假如被占用了会自动从8719开始依次+1扫描。直至找到未被占用的端口
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'

##### ④、主启动 #####

package com.atguigu.springcloud.alibaba;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    
    @EnableDiscoveryClient
    @SpringBootApplication
    public class MainApp8401
    { 
        public static void main(String[] args) { 
            SpringApplication.run(MainApp8401.class, args);
        }
    }

##### ⑤、业务类FlowLimitController #####

package com.atguigu.springcloud.alibaba.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class FlowLimitController
    { 
        @GetMapping("/testA")
        public String testA() { 
            return "------testA";
        }
    
        @GetMapping("/testB")
        public String testB() { 
    
            return "------testB";
        }
    
    
    
    }

#### 3、启动Sentinel8080 ####

java -jar sentinel-dashboard-1.7.0

#### 4、启动微服务8401 ####

#### 5、启动8401微服务后查看sentienl控制台 ####

##### ①、空空如也，啥都没有 #####

##### ②、Sentinel采用的懒加载说明 #####

![在这里插入图片描述][202101080032006.png]  
效果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 5]

##### ③、结论 #####

sentinel8080正在监控微服务8401

### 四、流控规则 ###

#### 1、基本介绍 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 6]  
进一步解释说明  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 8]

#### 2、流控模式 ####

##### ①、直接（默认） #####

##### 1）、直接->快速失败（系统默认） #####

##### 2）、配置及说明、 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 9]

##### 3）、测试 #####

快速点击访问http://localhost:8401/testA  
结果：Blocked by Sentinel (flow limiting)  
思考？？？-> 直接调用默认报错信息，技术方面OK but，是否应该有我们自己的后续处理？类似有一个fallback的兜底方法？

##### ②、关联 #####

##### 1）、是什么？ #####

当关联的资源达到阈值时，就限流自己  
当与A关联的资源B达到阈值后，就限流自己  
B惹事，A挂了

##### 2）、配置A #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 10]

##### 3）、postman模拟并发密集访问testB #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 11]  
访问testB成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 12]  
postman里新建多线程集合组  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 13]  
将访问地址添加进新线程组  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 14]  
Run：大批量线程高并发访问B，导致A失效了

##### 4）、运行后发现testA挂了 #####

点击访问http://localhost:8401/testA  
Blocked by Sentinel (flow limiting)

##### ③、链路 #####

多个请求调用了同一个微服务

#### 3、流控效果 ####

##### ①、直接->快速失败（默认的流控处理） #####

![在这里插入图片描述][20210108203040454.png]

##### ②、预热 #####

##### 1）、说明 #####

公式：阈值除以coldFactor（默认值为3），经过预热时长后才会达到阈值

##### 2）、官网 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 16]  
默认coldFactor为3，即请求QPS从threshold/3开始，经预热时长逐渐升至设定的QPS阈值。  
限流 冷启动：  
[https://github.com/alibaba/Sentinel/wiki/%E9%99%90%E6%B5%81—%E5%86%B7%E5%90%AF%E5%8A%A8][https_github.com_alibaba_Sentinel_wiki_E9_99_90_E6_B5_81_E5_86_B7_E5_90_AF_E5_8A_A8]

##### 3）、源码 #####

com.alibaba.csp.sentinel.slots.block.flow.controller.WarmUpController  
![在这里插入图片描述][20210108203657112.png]

##### 4）、Warmup配置 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 17]

##### 5）、多次点击http://localhost:8401/testB #####

刚开始不行，后续慢慢OK

##### 6）、应用场景 #####

![在这里插入图片描述][2021010820375347.png]

##### ③、排队等待 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 18]  
匀速排队，阈值必须设置为QPS  
官网  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][20210108203857599.png]  
源码：com.alibaba.csp.sentinel.slots.block.flow.controller.RateLimiterController  
测试：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 20]

### 五、降级规则 ###

#### 1、基本介绍 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 21]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 22]  
进一步说明  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 23]  
Sentinel的断路器是没有半开状态的

#### 2、降级策略实战 ####

##### ①、RT #####

是什么  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 24]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 25]  
测试：  
代码

@GetMapping("/testD")
        public String testD()
        { 
            try {  TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) {  e.printStackTrace(); }
            log.info("testD 测试RT");
    
            return "------testD";
        }

配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 26]  
jmeter压测  
结论：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 27]  
![在这里插入图片描述][2021010822534644.png]

##### ②、异常比例 #####

是什么  
![在这里插入图片描述][20210108225455662.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 28]  
测试  
代码

@GetMapping("/testD")
        public String testD()
        { 
    
            log.info("testD 测试RT");
            int age = 10/0;
            return "------testD";
        }

配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 29]  
jmeter  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 30]  
结论  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 31]

##### ③、异常数 #####

是什么  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 32]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 33]  
异常数是按照分钟统计的  
测试  
代码：

@GetMapping("/testE")
    public String testE()
    { 
        log.info("testE 测试异常数");
        int age = 10/0;
        return "------testE 测试异常数";
    }

配置：http://localhost:8401/testE  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 34]  
jmeter

### 六、热点key限流 ###

#### 1、基本介绍 ####

是什么  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 35]

#### 2、官网 ####

[https://github.com/alibaba/Sentinel/wiki/热点参数限流][https_github.com_alibaba_Sentinel_wiki]

#### 3、承上启下复习start ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 36]  
@SentinelResource

#### 4、代码 ####

@GetMapping("/testHotKey")
    @SentinelResource(value = "testHotKey",blockHandler = "deal_testHotKey")
    public String testHotKey(@RequestParam(value = "p1",required = false) String p1,
                             @RequestParam(value = "p2",required = false) String p2) { 
        //int age = 10/0;
        return "------testHotKey";
    }
     
    //兜底方法
    public String deal_testHotKey (String p1, String p2, BlockException exception){ 
        return "------deal_testHotKey,o(╥﹏╥)o";  
    }

com.alibaba.csp.sentinel.slots.block.BlockException

#### 5、配置 ####

![在这里插入图片描述][20210109103525392.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 37]

#### 6、测试 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 38]

#### 7、参数例外项 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 39]  
配置：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 40]

#### 8、其他 ####

手贱添加异常看看…  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 41]

### 七、系统规则 ###

#### 1、是什么 ####

[https://github.com/alibaba/Sentinel/wiki/%E7%B3%BB%E7%BB%9F%E8%87%AA%E9%80%82%E5%BA%94%E9%99%90%E6%B5%81][https_github.com_alibaba_Sentinel_wiki_E7_B3_BB_E7_BB_9F_E8_87_AA_E9_80_82_E5_BA_94_E9_99_90_E6_B5_81]

#### 2、各项配置参数说明 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 42]

#### 3、配置全局QPS ####

### 八、@SentinelResource ###

[SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（12）-- SpringCloud Alibaba Sentinel @SentinelResource][SpringCloud Hoxton_ _ SpringCloud alibaba_12_-- SpringCloud Alibaba Sentinel _SentinelResource]

### 九、服务熔断功能 ###

[SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（13）-- SpringCloud Alibaba Sentinel 服务熔断功能][SpringCloud Hoxton_ _ SpringCloud alibaba_13_-- SpringCloud Alibaba Sentinel]

### 十、规则持久化 ###

#### 1、是什么 ####

一旦我们重启应用，Sentinel规则将消失，生产环境需要将配置规则进行持久化

#### 2、怎么玩 ####

将限流配置规则持久化进Nacos保存，只要刷新8401某个rest地址，sentinel控制台的流控规则就能看到，只要Nacos里面的配置不删除，针对8401上Sentinel上的流控规则持续有效

#### 3、步骤 ####

##### ①、修改cloudalibaba-sentinel-service8401 #####

##### ②、POM #####

<dependency>
        <groupId>com.alibaba.csp</groupId>
        <artifactId>sentinel-datasource-nacos</artifactId>
    </dependency>

##### ③、YML #####

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
            port: 8719
          datasource:
            ds1:
              nacos:
                server-addr: localhost:8848
                dataId: cloudalibaba-sentinel-service
                groupId: DEFAULT_GROUP
                data-type: json
                rule-type: flow
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'
    
    feign:
      sentinel:
        enabled: true # 激活Sentinel对Feign的支持

添加Nacos数据源配置

spring:
       cloud:
        sentinel:
        datasource:
         ds1:
          nacos:
            server-addr:localhost:8848
            dataid:${ spring.application.name}
            groupid:DEFAULT_GROUP
            data-type:json
                rule-type:flow

##### ④、添加Nacos业务规则配置 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 43]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 44]  
内容解析

[
        { 
             "resource": "/retaLimit/byUrl",
             "limitApp": "default",
             "grade":   1,
             "count":   1,
             "strategy": 0,
             "controlBehavior": 0,
             "clusterMode": false    
        }
    ]

##### ⑤、启动8401后刷新sentinel发现业务规则有了 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 45]

##### ⑥、快速访问测试接口 #####

http://localhost:8401/rateLimit/byUrl  
![在这里插入图片描述][20210109160803200.png]

##### ⑦、停止8401再看sentinel #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 46]

##### ⑧、重新启动8401再看sentinel #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 47]

## 下一篇：[SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（12）-- SpringCloud Alibaba Sentinel @SentinelResource][SpringCloud Hoxton_ _ SpringCloud alibaba_12_-- SpringCloud Alibaba Sentinel _SentinelResource] ##

[SpringCloud Hoxton_ _ SpringCloud alibaba_10_-- Linux_Nacos_MySQL]: https://blog.csdn.net/exodus3/article/details/112253769
[https_github.com_alibaba_Sentinel]: https://github.com/alibaba/Sentinel
[https_github.com_alibaba_Sentinel_wiki_E4_BB_8B_E7_BB_8D]: https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D
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[https_github.com_alibaba_Sentinel_releases]: https://github.com/alibaba/Sentinel/releases
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 1]: /images/20221119/87cdd85e72b1494c825a0e34d0bce665.png
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[https_spring-cloud-alibaba-group.github.io_github-pages_greenwich_spring-cloud-alibaba.html_spring_cloud_alibaba_sentinel]: https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel
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[20210108203040454.png]: /images/20221119/cbe66775f85d4ef1b4f743f79bc71864.png
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[https_github.com_alibaba_Sentinel_wiki_E9_99_90_E6_B5_81_E5_86_B7_E5_90_AF_E5_8A_A8]: https://github.com/alibaba/Sentinel/wiki/%E9%99%90%E6%B5%81---%E5%86%B7%E5%90%AF%E5%8A%A8
[20210108203657112.png]: /images/20221119/6db2050cde744138b4b40744e7b84ac8.png
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[https_github.com_alibaba_Sentinel_wiki]: https://github.com/alibaba/Sentinel/wiki/%E7%83%AD%E7%82%B9%E5%8F%82%E6%95%B0%E9%99%90%E6%B5%81
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[https_github.com_alibaba_Sentinel_wiki_E7_B3_BB_E7_BB_9F_E8_87_AA_E9_80_82_E5_BA_94_E9_99_90_E6_B5_81]: https://github.com/alibaba/Sentinel/wiki/%E7%B3%BB%E7%BB%9F%E8%87%AA%E9%80%82%E5%BA%94%E9%99%90%E6%B5%81
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[SpringCloud Hoxton_ _ SpringCloud alibaba_12_-- SpringCloud Alibaba Sentinel _SentinelResource]: https://blog.csdn.net/exodus3/article/details/112388731
[SpringCloud Hoxton_ _ SpringCloud alibaba_13_-- SpringCloud Alibaba Sentinel]: https://blog.csdn.net/exodus3/article/details/112392060
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