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Chapter 32. Scheduled Jobs
32.1. Overview
A scheduled job builds on a regular job by allowing you to specifically schedule how the job should be run. Scheduled jobs are part of the Kubernetes API, which can be managed with oc commands like other object types.
As of OpenShift Container Platform 3.3.1, Scheduled Jobs is a feature in Technology Preview.
32.2. Creating a Scheduled Job
A scheduled job configuration consists of the following key parts:
- A schedule specified in cron format.
- A job template used when creating the next job.
- An optional deadline (in seconds) for starting the job if it misses its scheduled time for any reason. Missed jobs executions will be counted as failed ones. If not specified, there is no deadline.
ConcurrencyPolicy: An optional concurrency policy, specifying how to treat concurrent jobs within a scheduled job. Only one of the following concurrent policies may be specified. If not specified, this defaults to allowing concurrent executions.-
Allowallows Scheduled Jobs to run concurrently. -
Forbidforbids concurrent runs, skipping the next run if the previous has not finished yet. -
Replacecancels the currently running job and replaces it with a new one.
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An optional flag allowing the suspension of a scheduled job. If set to
true, all subsequent executions will be suspended.
The following is an example of a ScheduledJob resource:
apiVersion: batch/v2alpha1 kind: ScheduledJob metadata: name: pi spec: schedule: */1 * * * ? 1 jobTemplate: 2 spec: template: spec: containers: - name: pi image: perl command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"] restartPolicy: Never
- Schedule for the job. In this example, a job will run every minute.
- Job template. This is similar to the job example.
32.3. Known Issues
32.3.1. Unable to Edit a Scheduled Job
There is a known issue when invoking oc edit scheduledjob due to an error that was already fixed in the latest version. However, due to significant code changes, this was not backported.
One possible solution is to use oc patch command instead of oc edit.
32.3.2. Unable to Change Concurrency Policy
There is a known issue when changing concurrency policy where no new jobs are created after that operation is run. The issue is still under investigation in the latest version.
