Scheduled task

The idea is in the form of the first line of this crontab (cron table). Work regularly
according to a given schedule, recorded https://cronnow.com the format in cron.

If you enable the CronJob properties for the manifest, be sure to specify the name yourself.
is a valid DNS subdomain name.
The identifier must not contain more than Fladskrrrm characters. This is because it allows the cronjob to automatically see the controller.
Add 11 characters to make it easier to enter the title and task, here’s a limit that increases the spacing
The maximum length of the job name must not exceed 63 characters.Cron

CronJobs are usually designed to perform scheduled activities on a regular basis, such as backups,
Reports and so on. Each of these tasks must be configured to run multiple times.
for an indefinite period immediately (for example: after oneday/one week for each month); You can put a point
in the season in the period in which the order can start.

Example

This prints out example-manifest-cronjob every minute with the current time and a welcome message:

(Run automated jobs between CronJob
will acquaint you with this presentation in more detail).

Cron Scheduling Syntax

# â"Œâ"€–"€–"€–––––––––––––––––––––––––– ––– – ––––––––– (0–59)
# │ ┌─–”€–”€––––––––––––––––––––––––––– –––– –– –––––––––––––––––––––––––– 23)
Day of four weeks (1 - 31)
# â“‚ â“‚ â“‚ â“Œ“ ”€ 30 days (1 - 12)
# ‚ ‚ ‚ ‚ ‚ ‚ ‚ Œ“€“ ”€–”€ Day of our week (0–6) (Sunday to Saturday;
# positive ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚ 7 also Sunday on some systems)
# ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚
# ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚
# * * ( empty ) * *

For example, the type below specifies that the task should run on Friday every evening and at midnight on the 13th of every month:

In fact, you can use web tools such as crontab.guru to formulate CronJob scheduling expressions.

CronJob Limits

A task creates a task target about once per hour of off-schedule execution. We just say “done”.
There are certain circumstances in which two jobs can be created or one good job cannot be created. Let’s try, Lesya rarely does it,
but you don’t necessarily prevent them from doing so. Therefore, jobs must be idempotent.

If startingDeadlineSeconds is set to another large value or not set ( default value in the event)
and set concurrencyPolicy which Allow what jobs you still need to run
at least once.

A warning. If startingDeadlineSeconds is programmed to be less than ten seconds, the cron job may not be very scheduled. This is because CronJob checks the controller every ten seconds.

For Controller, CronJob looks at how many schedules were lost during the last valid time. available If more than 100 missed lifestyles. , the work of the person will not start, and the error will be written to the define log

Unable to run the job. Lots of missing start times 100) (>.spec.startingDeadlineSeconds or decrement set otherwise check clock skew.

It’s important to note that when the startingDeadlineSeconds range (not nil) is set, the control counts the number of skipped tasks based on the startingDeadlineSeconds value. is not suitable now and from the time scheduled until now. For example, if startingdeadlineseconds is 200, thencounts the number of tasks skipped in the last 200 seconds.CronJob

a is more likely to be considered a failure if the application cannot be built within the scheduled period. For example, if the concurrencyPolicy is set to Forbid and an A cron job is attempted to stay on the schedule while the old still schedule is running, the running one might be considered skipped. p>

For example, suppose each CronJob is set to run a new job every minute when it arrives at 08:30:00, and
The startingDeadlineSeconds field is often not set. When game controller appears in cronjob
closes 08:29:00, so don’t set work 10:21:00 because the number of skipped things that missed their schedule is more than 100.

To fully illustrate this concept, suppose a CronJob is set to run a new job every specified minute starting from 08:30:00.
startingDeadlineSeconds is set to 200 seconds. When the CronJob controller passeson dit
be paper in the same period as in the previous example (from 08:29:00 to 10:21:00). .This happens when the controller is currently checking for the number of missed schedules in the last 200 instants (i.e. 3 schedules), rather than skipping the last scheduled hour before this point.

CronJob is only responsible for developing jobs that fit the schedule, work, and
which, in turn, presents a situation for convenient control of the module.

Controller Version

Starting with Kubernetes 1 version.21, this is the second version of CronJob
is the default implementation controller. To disable the current default CronJob controller
instead use the old CronJob La controller, often pass CronJobControllerV2
door feature
flag for kube-controller-manager,
and set the flag of that to false.Next

--feature-gates="CronJobControllerV2=false"

Caution:

All CronJob Schedule: schedules are timezone based
kube-controller-manager.on

If your control plane is running kube-controller-manager or Pods without
Container timezone mapping for kube-controller-manager defines a container in any timezone.setting
this cron takes control.

Caution:
Scheduled task

API v1
is not called support for setting the time as a zone, explained earlier.

However, setting variables such as CRON_TZ is not supported by TZ in any official Kubernetes project.
CRON_TZ TZ or is each implementation detail of the internal parameters used.
for analysis andour own creation time next for analysis work. Any use of them is not
recommended in a new production cluster.

De API version: CronJob

metadata:

 batch/v1

gender: noun: hello

Specifications:

  Schedule: "*6. * * *"

  working model:

    Specifications:

      Model:

        Specifications:

          Container:

          ; Name: hello

            Image: Busybox

            imagePullPolicy: IfnoPtressent

            Order:

            : /bin/sch

            - -AGAINST

            /Date of; echo Hello from my kubernetes cluster

         Restart Policy: OnFailure



How to set up Cron for non EXE files?


 

How do I set up a cron job?