Sentinel实现流控应用

清疚 2022-11-28 10:38 167阅读 0赞

## Sentinel实现流控应用 ##

1.安装并启动Dashboard控制台  
1）依赖安装

需要openjdk1.8以上

yum install java-1.8.0-openjdk.aarch64

2）配置环境变量

需要设置JAVA\_HOME变量

vim /etc/profile，增加如下内容

export JAVA\_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-7.b13.el7.ns7.01.aarch64/jre

让修改立即生效：source /etc/profile

3）官网下载Jar包

wget https://github.com/alibaba/Sentinel/releases/download/1.7.0/sentinel-dashboard-1.7.0.jar

默认下载目录/usr/local/src

4）启动控制台

cd /usr/local/src

java -jar sentinel-dashboard-1.7.0.jar  
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默认端口8080，开发端口8080

firewall-cmd --zone=public --add-port=8080/tcp --permanent

firewall-cmd --reload

5）远程访问控制台

本地浏览器访问http://192.168.8.81:8080/\#/dashboard/home进行登录，默认账号密码均是sentinel，进入首页  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 1]

2.Sentinel实现直接限流  
1）添加依赖

*  添加的spring-cloud-alibaba-dependencies和 spring-cloud-starter-alibaba-sentinel版本必须一致，且版本不能太低，否则可能获取不到控制台数据以及无法配置clientIp  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 2]

2）添加配置

*  此处如果出现下面抓包的IP和本机IP不一致的情况需配置sentinel客户端的ClientIp为本地IP  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 3]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 4]

3）限流埋点(自定义埋点)  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 5]

4）创建快速失败的直接限流模式

访问本地8080端口  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 6]

访问sentinel控制台

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 7]

进入流控规则，添加QPS单机阈值为2的直接流控模式的快速失败限流规则  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 8]

5）测试快速失败的直接限流模式

多次快速访问http://localhost:8088/waita，当QPS超过2时，直接返回以下错误

Whitelabel Error Page  
This application has no explicit mapping for /error, so you are seeing this as a fallback.  
Mon Aug 03 17:47:17 CST 2020  
There was an unexpected error (type=Internal Server Error, status=500).  
No message available

![在这里插入图片描述][20200817105358648.gif_pic_center]

在sentinel控制台也能看到实时监控

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 9]

3.Sentinel实现关联限流  
1）添加依赖

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 10]

2）添加配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 11]

3）编写测试的控制器

编写两个接口用于测试，R1和R2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 12]

4）构建关联限流规则

启动应用，访问sentinel控制台http://192.168.8.81:8080/

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 13]

新增直接失败的关联限流的流控规则

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 14]

5）测试关联限流

下载Apache的压力测试工具ab.exe发送并发流量请求，使用压测工具发送并发流量超过QPS值大于1的流量给接口R2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 15]

同时访问R1接口会出现访问被阻止现象  
![在这里插入图片描述][20200817104616188.png_pic_center]

而在sentinel控制台的实时监控会检测到访问R1接口的QPS被拒绝访问

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjUwNjE2_size_16_color_FFFFFF_t_70_pic_center 16]

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