SpringCloud-2.0-周阳（21. Sentinel 环境搭建）

╰半橙微兮° 2023-09-28 12:20 8阅读 0赞

[上一篇 ：20.Nacos 集群和持久化配置][_20.Nacos]

[下一篇 ：22. 流量监控 - Sentinel][_22. _ - Sentinel]

*  **声明：原文作者：csdn：yuan\_404**

### 文章目录 ###

*  1 . 概述
 *  2 . Sentinel 控 制台
 *  3 . 工程环境搭建

# 1 . 概述 #

*  官网 ：[https://github.com/alibaba/Sentinel][https_github.com_alibaba_Sentinel]
 *  中文文档 ：[https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D][https_github.com_alibaba_Sentinel_wiki_E4_BB_8B_E7_BB_8D]
 *  是一个轻量级的流量控制、熔断降级 Java 库
 *  主要特性  
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70][]

# 2 . Sentinel 控 制台 #

*  Sentinel 组件由 2 部分组成

>  *  **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等框架也有较好的支持。
>  *  **控制台**(Dashboard)基于Spring Boot 开发，打包后可以直接运行，不需要额外的Tomcat等应用容器。

1.  下载 Sentinel

*  下载地址 ：[https://github.com/alibaba/Sentinel/releases][https_github.com_alibaba_Sentinel_releases]  
    ![20201220141600872.png][]

1.  前提  
    确保有 Java 8 的环境，且 8080 端口没有被占用
2.  进入存放 Sentinel 的目录，并运行命令
    
        java -jar sentinel-dashboard-1.8.0.jar
3.  访问 ：[http://localhost:8080][http_localhost_8080]  
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 1][]
4.  登录账号密码均为 ：sentinel  
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 2][]

# 3 . 工程环境搭建 #

1.  新建模块 ：alibaba-sentinel-service-8401
2.  修改 POM
    
        <dependencies>
            <dependency>
                <groupId>com.demo.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>`
3.  编写 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.  编写主启动类
    
        @EnableDiscoveryClient
        @SpringBootApplication
        public class SentinelSerMain8401 {
              
            public static void main(String[] args) {
              
                SpringApplication.run(SentinelSerMain8401.class, args);
            }
        }
5.  业务类

*  Controller ：====
    
        @RestController
        public class FlowLimitController {
              
            @GetMapping("/testA")
            public String testA() {
              
                return "------testA";
            }
        
            @GetMapping("/testB")
            public String testB() {
              
                return "------testB";
            }
        }

1.  启动 Nacos、Sentinel 控制台  
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 3][]
2.  启动 alibaba-sentinel-service-8401 项目  
    ![20201220150331316.png][]
3.  查看 Sentinel 控制台
    
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 4][]

*  因为 Sentinel 采用的是**懒加载**
 *  执行一下请求  
    [http://localhost:8401/testA][http_localhost_8401_testA]  
    [http://localhost:8401/testB][http_localhost_8401_testB]
 *  再刷新 Sentinel 控制台  
    ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 5][]

[_20.Nacos]: https://blog.csdn.net/Mango_Bin/article/details/125475366
[_22. _ - Sentinel]: https://blog.csdn.net/Mango_Bin/article/details/125475496
[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
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20201220140833607.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70
[https_github.com_alibaba_Sentinel_releases]: https://github.com/alibaba/Sentinel/releases
[20201220141600872.png]: https://img-blog.csdnimg.cn/20201220141600872.png
[http_localhost_8080]: http://localhost:8080
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201220141926875.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201220142030434.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20201220150227408.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70
[20201220150331316.png]: https://img-blog.csdnimg.cn/20201220150331316.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20201220150428537.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70
[http_localhost_8401_testA]: http://localhost:8401/testA
[http_localhost_8401_testB]: http://localhost:8401/testB
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20201220150630954.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA==,size_16,color_FFFFFF,t_70