[Java知识库]SpringCloudAlibaba 【5】Sentinel 初始化监控

Sentinel

Github

https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D

国内官网文档

quick-start

下载和安装

https://github.com/alibaba/Sentinel/releases

?官方提供的手册：https://spring-cloud-alibaba-group.github.io/github-pages/hoxton/en-us/index.html#_spring_cloud_alibaba_sentinel

Sentinel 分为两个部分

核心库（Java客户端）

不依赖任何框架/库，只需要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。

启动步骤

1. 前提：jdk1.8环境和8080端口不能被占用
2. 启动命令：java -jar sentinel-dashboard-1.8.2.jar
3. 访问地址：localhost:8080
4. 输入默认账号密码：sentinel/sentinel

搭建Sentinel项目

导入sentinel依赖

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!-- sentinel依赖 -->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

完整pom.xml

 <parent>
        <artifactId>demo</artifactId>
        <groupId>com.springcloud</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.springcloud</groupId>
    <artifactId>sentinel-8401</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sentinel-8401</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

application.properties 配置

server.port=8401
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.application.name=sentinel8401
management.endpoints.web.exposure.include=*

# sentinel dashboard 地址
spring.cloud.sentinel.transport.dashboard=localhost:8080
# 默认是8179端口。被占用会自动8719+1，直到找到为被占用的端口
spring.cloud.sentinel.transport.port=8179

创建 DemoController ，并请求接口。

查看 Sentinel 控制台

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