【SpringCloudAlibaba】Sentinel监控工具实战

前言

最近在搭建SpringCloudAlibaba相关的组件，今天主要是练习的是Sentinel,可视化界面的仪表盘，进行实时监控，流控、速率控制、服务熔断、服务降级

Sentinel：

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

官网：
https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel

下载地址：
https://github.com/alibaba/Sentinel/releases

Sentinel控制台

运行：

Sentinel监控
首先需要启动我们的服务注册中心—nacos

初始化工程
创建新的model工程8401
修改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>com.zcw.springcloud2020508</artifactId>
        <groupId>com.zcw</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-sentinel-service8401</artifactId>

    <dependencies>
        <!--SpringCloud alibaba nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--SpringCloud alibaba sentinel-datasource-nacos 后续做持久化用到-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        <!--SpringCloud alibaba 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-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

创建YML

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开始依次+1扫描，直至到未被占用的端口
        port: 8719



        
management:
  endpoints:
    web:
      exposure:
        include: '*'

创建启动类


package com.zcw.springcloud.alibaba;

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

/**
 * @ClassName : SentinelServiceApplication8401
 * @Description :
 * @Author : Zhaocunwei
 * @Date: 2020-05-27 09:38
 */
@EnableDiscoveryClient
@SpringBootApplication
public class SentinelServiceApplication8401 {
    public static void main(String[] args) {
        SpringApplication.run(SentinelServiceApplication8401.class,args);
    }
}

创建业务类


package com.zcw.springcloud.alibaba.controller;

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

/**
 * @ClassName : FlowLimitController
 * @Description :
 * @Author : Zhaocunwei
 * @Date: 2020-05-27 11:18
 */
@RestController
public class FlowLimitController {
    @GetMapping("/testA")
    public String testA(){
        return "---------testA";
    }
    @GetMapping("/testB")
    public String testB(){
        return "---------testB";
    }
}