cron

Linux系统如何更改时间时区

由 邮差的信 提交于 2020-12-14 01:21:51
对于许多与系统相关的任务和进程，使用正确的时区是必不可少的。例如，cron守护进程使用系统的时区执行cron作业，日志文件中的时间戳基于同一系统的时区。 环境 Centos 8 检查现在的时区 timedatectl 是一个 命令 行实用程序，允许您查看和更改系统的时间和日期。 [root@localhost ~]# timedatectl Local time: Tue 2020-03-31 16:35:23 CST Universal time: Tue 2020-03-31 08:35:23 UTC RTC time: Tue 2020-03-31 08:35:23 Time zone: Asia/Shanghai (CST, +0800) System clock synchronized: yes NTP service: active RTC in local TZ: no 更改时区 在更改时区之前，您需要找出要使用的时区名称。要列出所有可用时区，请使用下面的 命令 ： [root@localhost ~]# timedatectl list-timezones … Asia/Samarkand Asia/Seoul Asia/Shanghai Asia/Singapore Asia/Srednekolymsk … 然后使用 set-timezone 选项更改时区

Avoid multiple cron jobs running for one cron execution point in Kubernetes

由 廉价感情. 提交于 2020-12-13 07:32:39
问题 EDIT: Question is solved, it was my mistake, i simply used the wrong cron settings. I assumed "* 2 * * *" would only run once per day at 2, but in fact it runs every minute past the hour 2. So Kubernetes behaves correctly. I keep having multiple jobs running at one cron execution point. But it seems only if those jobs have a very short runtime. Any idea why this happens and how I can prevent it? I use concurrencyPolicy: Forbid , backoffLimit: 0 and restartPolicy: Never . Example for a cron

One time custom cron schedule in laravel

由 一世执手 提交于 2020-12-13 03:40:56
问题 I want to run a cron just once at a custom date & time entered by the user in a form. What is the best way to do this? I found that a custom cron can be scheduled in laravel like this ->cron(‘* * * * * *’); Run the task on a custom Cron schedule. But I could not find the time format what the * mean. Or much simpler, can it be done like this by adding the date and time. ->at('28/04/2020 13:00'); How can this be done? 回答1: you can easily do that with when() method $schedule->command('command')-

One time custom cron schedule in laravel

由 六月ゝ 毕业季﹏ 提交于 2020-12-13 03:26:31
问题 I want to run a cron just once at a custom date & time entered by the user in a form. What is the best way to do this? I found that a custom cron can be scheduled in laravel like this ->cron(‘* * * * * *’); Run the task on a custom Cron schedule. But I could not find the time format what the * mean. Or much simpler, can it be done like this by adding the date and time. ->at('28/04/2020 13:00'); How can this be done? 回答1: you can easily do that with when() method $schedule->command('command')-

Bigquery Custom Schedule Cron Syntax Not Accepted

由 久未见 提交于 2020-12-12 05:50:25
问题 I am trying to schedule a query to run intraday in Bigquery UI. According to Google's documentation this option uses cron syntax. I have used crontab guru to verify the syntax is correct, although it doesn't matter what syntax you put the scheduler doesn't seem to accept any. Is this a known bug? Below is the cron syntax I'm using to run every 6 hours. 0 */6 * * * 回答1: Form the official documentation: When selecting Custom, a Cron-like time specification is expected, for example every 3 hours

LoadError: Unable to autoload constant (Rails + Sidekiq)

由 烈酒焚心 提交于 2020-12-12 05:19:15
问题 In my development environement I am getting this error : WARN: LoadError: Unable to autoload constant Alerts::FailedReportWorker, expected /my-path/app/workers/alerts/failed_report_worker.rb to define it. I have these workers in my schedule.yml file : alert_sla_worker: cron: "*/1 * * * *" class: "Alerts::SlaWorker" alert_failed_export_worker: cron: "*/1 * * * *" class: "Alerts::FailedExportWorker" alert_failed_report_worker: cron: "*/1 * * * *" class: "Alerts::FailedReportWorker" alert_failed

spring boot定时任务

由 安稳与你 提交于 2020-12-11 12:24:29
介绍 定时任务是程序开发中重要且不可缺少的功能，它会自动按照设定好的时间规则，按时完成执行任务，一般周期性更新数据状态，闲时缓存数据，执行计划任务。 本次主要介绍spring scheduled 种类 定时任务调度的，一般有3种。 Timer：java自带定时任务类，单线程执行，适合轻度 scheduled：spring 官方定时任务调度，配置简单，支持多线程，通过注解设置，支持cron时间格式。 quartz：功能强大的定时任务调度框架，支持分布式，可动态实现任务调度加载。 cron时间规则 Cron表达式由6或7个空格分隔的时间字段组成：秒 分钟 小时 日期 月份 星期 年（可选） 字段　　允许值　　允许的特殊字符 秒 　 0-59 　　　　, - * / 分 　 0-59　　　　 , - * / 小时 0-23 　　　　, - * / 日期 1-31 　　　　, - * ? / L W C 月份 1-12 　　　　, - * / 星期 1-7 　　　　 , - * ? / L C # 年 1970-2099 　　, - * / 使用 简单任务 通过@EnableScheduling开启定时任务调度。 package com.cn.web.common; @Component //添加注入 @EnableScheduling //开启定时任务 public class

理解postgreSQL中的prepared transactions和处理孤儿(orphans)事务

由 橙三吉。 提交于 2020-12-10 10:00:00
Prepared transactions是PostgreSQL的一个关键特性。理解该特性提供的功能和处理任何潜在的陷阱对于系统的维护是很关键的。所以，我们来深入研究一下具体什么是prepared transactions。 关于事务 在数据库系统中，事务是一种处理通常包含多个语句的块中的全部或零个语句的方法。在提交整个块之前，该块中语句的结果对其他事务不可见。 如果事务失败或回滚，则对数据库完全没有影响。 事务依附于会话。但是，当要执行与会话独立的事务时（也有其他好处）。这就是“prepared transactions”的来源。 prepared transactions prepared transaction是独立于会话、抗崩溃、状态维护的事务。事务的状态存储在磁盘上，这使得数据库服务器即使在从崩溃中重新启动后也可以恢复事务。在对prepared transaction执行回滚或提交操作之前，将一直维护该事务。 PostgreSQL文档声明，在一个已存在的事务块中，可以使用prepare transaction ’transaction_id‘命令创建一个prepared transaction。它进一步声明该过程为两阶段提交准备了一个事务。 此外，建议应用程序或交互式会话不要使用prepared transaction。理想情况下

How to trigger a Lambda function at specific time in AWS?

由 删除回忆录丶 提交于 2020-12-08 06:08:08
问题 I am aware of the CloudWatch recurring events that can be used to run Lambda recurringly.. but is there a way that I can trigger it on a certain time and not repeat? 回答1: you can provide to it a cron expression or rate. what you are looking for is the cron expression option that will let you to say when exactly to run. more info - https://docs.aws.amazon.com/lambda/latest/dg/tutorial-scheduled-events-schedule-expressions.html if you want to run it once, manually, you can always trigger it

How to schedule a cron job in spring boot without using @Scheduled() annotation

由 拜拜、爱过 提交于 2020-12-05 12:10:42
问题 In spring boot, can I schedule a spring job by not using @Scheduled annotation to a method? I am working with spring job in the spring boot. I want to schedule a job by using cron expression, but without using @Scheduled(cron = " ") annotation to the method. I know that I can schedule a job inside this method as below. @Scheduled (cron = "0 10 10 10 * ?") public void execute() { / * some job code * / } But I want it to be dynamic so that I can take a cron expression as input from the user and
订阅 cron