如何正确配置Kubernetes探测器定时（适用于Spring Boot应用程序）

Question

我们有一个简单的Spring Boot web应用程序，启动时间不到30秒。因此,我将探测配置如下：

    readinessProbe:
      httpGet:
        path: /actuator/health/readiness
        port: 8080
      initialDelaySeconds: 30
      periodSeconds: 1
    livenessProbe:
      httpGet:
        path: /actuator/health/liveness
        port: 8080
      initialDelaySeconds: 30
      periodSeconds: 1

我的理解是Readision probe等待30秒，然后将成功（如果应用程序启动）。而且活动性探测延迟30秒（从部署开始）开始并将在几乎同时就绪探测成功（如果应用程序准备就绪）的同时成功。但我在日志中看到的是准备状态探测器等待30秒然后成功，但之后还有30秒的等待时间，然后旧的吊舱就会关闭：

develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:07.378Z","logger":"org.springframework.boot.web.embedded.tomcat.TomcatWebServer","level":"INFO","thread":"main","message":"Tomcat started on port(s): 8080 (http) with context path ''"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:07.387Z","logger":"org.springframework.data.repository.config.DeferredRepositoryInitializationListener","level":"INFO","thread":"main","message":"Triggering deferred initialization of Spring Data repositories…"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:09.441Z","logger":"org.springframework.data.repository.config.DeferredRepositoryInitializationListener","level":"INFO","thread":"main","message":"Spring Data repositories initialized!"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:09.469Z","logger":"com.example.Application","level":"INFO","thread":"main","message":"Started Application in 23.918 seconds (JVM running for 25.343)"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:14.251Z","logger":"org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/]","level":"INFO","thread":"http-nio-8080-exec-1","message":"Initializing Spring DispatcherServlet 'dispatcherServlet'"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:14.258Z","logger":"org.springframework.web.servlet.DispatcherServlet","level":"INFO","thread":"http-nio-8080-exec-1","message":"Initializing Servlet 'dispatcherServlet'"}
develop/demo-57c8984866-6v5sl[demo]: {"ts":"2020-10-08T17:33:14.292Z","logger":"org.springframework.web.servlet.DispatcherServlet","level":"INFO","thread":"http-nio-8080-exec-1","message":"Completed initialization in 30 ms"}
develop/demo-79cc9bc757-xlg6z[demo]: 2020-10-08T17:33:44.590172 Shutting down...
develop/demo-79cc9bc757-xlg6z[demo]: {"ts":"2020-10-08T17:33:44.658Z","logger":"org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean","level":"INFO","thread":"SpringContextShutdownHook","message":"Closing JPA EntityManagerFactory for persistence unit 'default'"}
develop/demo-79cc9bc757-xlg6z[demo]: {"ts":"2020-10-08T17:33:44.664Z","logger":"org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor","level":"INFO","thread":"SpringContextShutdownHook","message":"Shutting down ExecutorService 'applicationTaskExecutor'"}
develop/demo-79cc9bc757-xlg6z[demo]: {"ts":"2020-10-08T17:33:44.667Z","logger":"com.zaxxer.hikari.HikariDataSource","level":"INFO","thread":"SpringContextShutdownHook","message":"HikariPool-1 - Shutdown initiated..."}
develop/demo-79cc9bc757-xlg6z[demo]: {"ts":"2020-10-08T17:33:44.680Z","logger":"com.zaxxer.hikari.HikariDataSource","level":"INFO","thread":"SpringContextShutdownHook","message":"HikariPool-1 - Shutdown completed."}

Answer 1

好的，我们用来管理k8s清单的工具（kubecfg）和库对minreadyseconds属性有不同的默认值（30秒）。我改变了，一切都像预期的那样运作。