2021-12-19 周天 ## Hystrix監控 ### actuator的監控節點 在`actuator`下有用來監控`hystrix`的端點`/actuator/hystrix.stream`。 訪問： ``` http://localhost:9202/actuator/hystrix.stream ``` 輸出：(注意監控時需要請求`@HystrixCommand`配置的微服務) ``` ping: data: {"type":"HystrixCommand","name":"feignCardRand","group":"TestController","currentTime":1641272819332,"isCircuitBreakerOpen":false,"errorPercentage":0,"errorCount":0,"requestCount":1000,"rollingCountBadRequests":0,"rollingCountCollapsedRequests":0,"rollingCountEmit":0,"rollingCountExceptionsThrown":0,"rollingCountFailure":0,"rollingCountFallbackEmit":0,"rollingCountFallbackFailure":0,"rollingCountFallbackMissing":0,"rollingCountFallbackRejection":0,"rollingCountFallbackSuccess":0,"rollingCountResponsesFromCache":0,"rollingCountSemaphoreRejected":0,"rollingCountShortCircuited":0,"rollingCountSuccess":1000,"rollingCountThreadPoolRejected":0,"rollingCountTimeout":0,"currentConcurrentExecutionCount":0,"rollingMaxConcurrentExecutionCount":10,"latencyExecute_mean":0,"latencyExecute":{"0":0,"25":0,"50":0,"75":0,"90":0,"95":0,"99":0,"99.5":0,"100":0},"latencyTotal_mean":0,"latencyTotal":{"0":0,"25":0,"50":0,"75":0,"90":0,"95":0,"99":0,"99.5":0,"100":0},"propertyValue_circuitBreakerRequestVolumeThreshold":20,"propertyValue_circuitBreakerSleepWindowInMilliseconds":5000,"propertyValue_circuitBreakerErrorThresholdPercentage":50,"propertyValue_circuitBreakerForceOpen":false,"propertyValue_circuitBreakerForceClosed":false,"propertyValue_circuitBreakerEnabled":true,"propertyValue_executionIsolationStrategy":"THREAD","propertyValue_executionIsolationThreadTimeoutInMilliseconds":1000,"propertyValue_executionTimeoutInMilliseconds":1000,"propertyValue_executionIsolationThreadInterruptOnTimeout":true,"propertyValue_executionIsolationThreadPoolKeyOverride":null,"propertyValue_executionIsolationSemaphoreMaxConcurrentRequests":10,"propertyValue_fallbackIsolationSemaphoreMaxConcurrentRequests":10,"propertyValue_metricsRollingStatisticalWindowInMilliseconds":10000,"propertyValue_requestCacheEnabled":true,"propertyValue_requestLogEnabled":true,"reportingHosts":1,"threadPool":"TestController"} ``` ### 集成hystrix dashboard 接口數據查看起來不直觀，可以運行`hystrix dashboard`通過界面來查看。 1. 先引入依賴 ~~~ xml <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId> </dependency> ~~~ 2. 創建啟動類 ~~~ java @EnableHystrixDashboard @SpringBootApplication(scanBasePackages = "com.github.mg0324") public class StartupApplication { public static void main(String[] args) { SpringApplication.run(StartupApplication.class,args); } } ~~~ 3. 添加首頁跳轉，支持端口直接到`hystrix`資源路徑 ~~~ java @Controller public class HystrixIndexController { @GetMapping("") public String index() { return "forward:/hystrix"; } } ~~~ 4. 添加配置端口 ~~~ server: port: 8030 hystrix: dashboard: # 設置允許連接的IP proxy-stream-allow-list: "192.168.3.29" ~~~ 5. 啟動服務，并訪問 `http://127.0.0.0:8030`  ### 監控詳情解讀 在 Hystrix Dashboard 界面里的url處填寫要監控的hystrix數據流地址。 如：http://192.168.3.29:9202/actuator/hystrix.stream  如果連接后的界面里什么都沒有顯示，則需要手動請求后，才能展現數據。可以用 ab 命令做請求壓測，加大壓力，讓熔斷器開啟，圖中會出現紅色。  ab命令如下： `ab -n 10000 -c 160 http://127.0.0.1:9201/test/test/feign/cardRand`  ## 集成Turbine監控 Turbine是一個聚合Hystrix監控數據的工具，它可將所有相關/hystrix.stream端點的數據聚合到一個組合的/turbine.stream中，從而讓集群的監控更加方便。 1. 添加依賴。 ~~~ <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-turbine</artifactId> </dependency> ~~~ 2. 編寫啟動類。 ~~~ @EnableTurbine @SpringBootApplication(scanBasePackages = "com.github.mg0324") public class StartupApplication { public static void main(String[] args) { SpringApplication.run(StartupApplication.class,args); } } ~~~ 3. 添加配置。 ~~~ server: port: 8031 spring: application: name: card-hystrix-turbine eureka: client: service-url: defaultZone: http://192.168.3.29:8761/eureka/ instance: prefer-ip-address: true turbine: # 要監控的微服務列表，多個用,分隔 appConfig: mic-card,mic-test clusterNameExpression: "'default'" ~~~ 4. 啟動服務后，得到 http://192.168.3.29:8031/turbine.stream 的聚合節點。 5. 填寫到hystrix dashboard的url中做監控。  ## 參考 https://www.itmuch.com/spring-cloud/finchley-15/