代码地址:https://github.com/zhaoyunxing92/spring-boot-learn-box/tree/master/spring-boot-sentinel/sentinel-apollo

使用apollo为sentinel做数据持久化,sentinel的使用可以看sentinel使用,本项目打算采用spring-cloud-alibaba跟sentinel整合

背景

我们的项目即将上线了,但是缺少一个流量防卫兵,这个很要命,于是一周前我就开始着手看sentinel

为什么是sentinel

正如你们所了解的市面上有很多服务降级方案,如我也用过的hystrix,但是它没有完善的持久方案和后台管理界面再加上我也看了一片sentinel作者宿何的一篇对比文章Sentinel-与-Hystrix-的对比,而且我们现在的技术不太适合使用spring cloud体系

参考文档

• sentinel动态规则扩展
• Sentinel使用Apollo存储规则
• spring-cloud-alibaba

整合流程

pom.xml

  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
      <version>0.9.0.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>com.alibaba.csp</groupId>
      <artifactId>sentinel-datasource-apollo</artifactId>
      <version>1.6.0</version>
  </dependency>

application.yml

spring:
  application:
    name: spring-boot-sentinel-apollo
  cloud:
    sentinel:
      transport:
        port: 8719 # 向sentinel-dashboard传输数据的端口 默认:8719
        dashboard: localhost:8100 # sentinel-dashboard
      log:
        dir: ./logs # 默认值${home}/logs/csp/
        switch-pid: true # 日志带上线程id
      datasource:
        flow: # 流控规则
          apollo:
            namespaceName: application
            flowRulesKey: flowRules
            rule-type: flow #flow,degrade,authority,system, param-flow
        degrade: # 熔断降级规则
          apollo:
            namespaceName: application
            flowRulesKey: degrades
            rule-type: degrade
        authority: # 授权规则  未验证,官方不推荐
          apollo:
            namespaceName: application
            flowRulesKey: authoritys
            rule-type: authority
        system: # 系统规则
          apollo:
            namespaceName: application
            flowRulesKey: systems
            rule-type: system
        param-flow: # 热点规则
          apollo:
            namespaceName: application
            flowRulesKey: paramflows
            rule-type: param-flow
app:
  id: ${spring.application.name}
apollo:
  meta: http://127.0.0.1:8080
  cacheDir: ./apolloconfig  # 缓存文件位置

java

@SpringBootApplication
@EnableApolloConfig // 开启apollo
public class SpringSentinelApolloServer {
    public static void main(String[] args) {
        SpringApplication.run(SpringSentinelApolloServer.class, args);
    }
}

jvm参数配置

-Denv=DEV

flow(流控规则)参数格式json

[
    {
        "resource": "/hello", 
        "limitApp": "default",
        "grade": 1,
        "count": 3,
        "strategy": 0,
        "controlBehavior": 0,
        "clusterMode": false
    }
]

flow(流控规则)参数规则说明

system 系统规则参数格式,四个参数只能选择一个不能设置-1

[{"qps": 2}]

system参数列表

degrade 参数格式 json

[
    {
        "resource": "/rt",
        "count": 50,
        "timeWindow": 5,
        "grade": 0
    },
    {
        "resource": "/count",
        "count": 5,
        "timeWindow": 8,
        "grade": 2
    },
    {
        "resource": "/erro",
        "count": 0.5,
        "timeWindow": 5,
        "grade": 1
    }
]

degrade(熔断降级规则)参数规则说明

param-flow(热点规则) json

[
    {
        "resource": "/hello",
        "grade": 1,
        "paramIdx": 1,
        "count": 10,
        "paramFlowItemList": []
    }
]

param-flow(热点规则) 参数

apollo上配置

server.port = 7852
server.servlet.context-path = /sentinel
flowRules = [{"resource": "/hello","limitApp": "default","grade": 1,"count": 3,"strategy": 0,"controlBehavior": 0,"clusterMode": false}]
degrades = [{"resource": "/rt","count": 50,"timeWindow": 5,"grade": 0},{"resource": "/count","count": 5,"timeWindow": 8,"grade": 2},{"resource": "/erro","count": 0.5,"timeWindow": 5,"grade": 1}]
authoritys = [{"resource": "/hello","limitApp": "192.168.12.215","strategy": 1}]
paramflows = [{"resource": "/hello","grade": 1,"paramIdx": 1,"count": 10,"paramFlowItemList": []}]
systems = [{"qps": 20}]

拉去规则成功日志

  2019-05-14 09:26:46.072  INFO 10100 --- [           main] o.s.c.a.s.c.SentinelDataSourceHandler    : [Sentinel Starter] DataSource authority-sentinel-apollo-datasource load 1 AuthorityRule
  2019-05-14 09:26:46.090  INFO 10100 --- [           main] o.s.c.a.s.c.SentinelDataSourceHandler    : [Sentinel Starter] DataSource degrade-sentinel-apollo-datasource load 3 DegradeRule
  2019-05-14 09:26:46.099  INFO 10100 --- [           main] o.s.c.a.s.c.SentinelDataSourceHandler    : [Sentinel Starter] DataSource flow-sentinel-apollo-datasource load 1 FlowRule
  2019-05-14 09:26:46.115  INFO 10100 --- [           main] o.s.c.a.s.c.SentinelDataSourceHandler    : [Sentinel Starter] DataSource param-flow-sentinel-apollo-datasource load 1 ParamFlowRule
  2019-05-14 09:26:46.122  INFO 10100 --- [           main] o.s.c.a.s.c.SentinelDataSourceHandler    : [Sentinel Starter] DataSource system-sentinel-apollo-datasource load 1 SystemRule

测试接口

http://localhost:7852/sentinel/hello

最终效果图

sentinel-dashboard

apollo-dashboard

结尾

相信坚持看完的同学已经崩溃了,拉模式的配置太头疼了.的确为了完成这篇文章,里面的参数都是我在浏览器里面抓取过来的耗费了我大量的时间,巧的是sentinel官方也意识到了这点他们提供了推模式只不过需要修改sentinel-dashboard
的源码,后面我会把真理好的代码提交在sentinel-dashboard-apollo仓库,已经需改了一点,有兴趣的可以先去看