通过配置readiness探针和preStop hook，实现优雅启动和停止（滚动部署）

1. k8s工作负载配置

          readinessProbe:httpGet:path: /datetimeport: 8080scheme: HTTPinitialDelaySeconds: 30timeoutSeconds: 1periodSeconds: 30successThreshold: 1failureThreshold: 6lifecycle:preStop:exec:command:- /bin/sh- '-c'- sleep 15s

2. 网关改造

@SpringBootApplication
public class GracefulShutdownApplication {public static void main(String[] args) {SpringApplication.run(GracefulShutdownApplication.class, args);}@Beanpublic GracefulShutdown gracefulShutdown() {return new GracefulShutdown();}
}

public class GracefulShutdown implements ApplicationListener<ContextClosedEvent> {@Overridepublic void onApplicationEvent(ContextClosedEvent contextClosedEvent) {HttpResources.disposeLoopsAndConnectionsLater().delaySubscription(Duration.ofSeconds(20)).block();}
}

经过测试发现，可以实现请求0失败