SpringCloud Alibaba之Sentinel案例初始化演示

所有代码都在github上：https://github.com/demonruin/cloud2020/tree/master

 

首先需要准备的为：nacos8848控制中心这里单点演示、sentinel-dashboard控制台8080、新建sentinel-service8401微服务

因为nacos8848是docker直接启动、sentinel-dashboard是jar包直接启动，下面只剩下新建一个sentinel-service8401了

1、新建modul为 cloudalibaba-sentinel-service8401,并在pom中添加相关依赖包，以后用alibaba这一套nacos和sentinel基本不分家

        <!--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>

2、构建application.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
        #默认8719端口，假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
        port: 8719

#暴露监控端点
management:
  endpoints:
    web:
      exposure:
        include: '*'

3、构建主启动类，添加服务发现注解

/**
 * created by king on 2020/5/26 3:46 下午
 */
@SpringBootApplication
@EnableDiscoveryClient
public class SentinelServiceMain8401 {
    public static void main(String[] args) {
            SpringApplication.run(SentinelServiceMain8401.class,args);
        }
}

4、构建FlowLimitController业务类进行测试

@RestController
@Slf4j
public class FlowLimitController {

    @GetMapping("/testA")
    public String testA()
    {
        return "------testA";
    }

    @GetMapping("/testB")
    public String testB()
    {
        log.info(Thread.currentThread().getName()+"\t"+"...testB");
        return "------testB";
    }

}

5、启动nacos8848、sentinel-dashboard8080、cloudalibaba-sentinel-service8401微服务

6、查看是否服务注册成功，sentinel监控是否成功

1、服务注册nacos成功

2、因为Sentinel采用的懒加载说明，所以此时查看sentinel-dashboard里面还是什么都没有，需要进行请求，才会产生数据，现在我们请求testA和testB接口,执行一次访问即可，下面我们来查看结果

此时说明：sentinel8080正在监控微服务8401

简单的初始化案例演示完成