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If you’ve anytime bare to agenda a distinct or alternating assignment in your Kubernetes clusters, it’s aloof a cronjob away. Jack Wallen shows you how.
Image: Jack Wallen
Kubernetes is one of the best adjustable and able alembic managers on the market. The added you dive into the technology, the added you apprehend it can do. Take for instance, Kubernetes’ adeptness to use the Linux cron apparatus for the scheduling of tasks.
Using the aggregate of Kubernetes and cron accomplish it accessible to not aloof actualize alternating tasks, but appointed tasks. With the scheduling of tasks, you are able to accept them run at a time back acceptance is low, as to not bog bottomward your array with tasks that are all-important but may not be anon accompanying to your assembly workflow.
So how do you accommodate cron into your Kubernetes cluster? You do it on a manifest-by-manifest basis. I’m activity to appearance you how to do aloof that. I’ll authenticate with a actual basal task, so you can calmly accept the concept.
In adjustment to add cron jobs, you’ll charge a active Kubernetes cluster. If you’ve yet to arrange one, analysis out my article: How to arrange a Kubernetes array on Ubuntu server.
SEE: Implementing DevOps: A adviser for IT pros (free PDF) (TechRepublic)
The aboriginal affair we charge do is actualize a YAML book for the task. Remember, this is a actual basal task, so our YAML book won’t accommodate too abundant information. Let’s breach it down.
The aboriginal area defines the API adaptation and the affectionate of job we’re creating. That area looks like:
The abutting area capacity the metadata for the job. That area looks like:
Next, we accept the specs for the job. This area contains our ambit for cron and is authentic by way of the agenda option, which will run the assignment every 15 minutes. This area looks like:
Now we accept the job arrangement section, some of which will abide bare (for simplicity). This area defines the angel acclimated for the alembic to be deployed–in this case, busybox. It additionally includes a few arguments, one of which is the achievement to be printed for the job (remember, this is a simple task). The achievement will be the date and a argument bulletin printed every 15 minutes, as authentic by the agenda option.
This area looks like:
Create the new book with the command:
In that file, adhesive the absolute capacity of the apparent apparent below:
Save and abutting the file.
Now we’re activity to arrange the job that includes the appointed task. To do that, affair the command:
Once the job runs, it’ll address that cron-hello has been created (Figure A).
Our appointed assignment deployment was successful.
You can ensure the cronjob assignment is active with the command:
This will account out every cronjob assignment on your array (Figure B).
I accept two containers that accommodate cronjobs on my Kubernetes cluster.
Let’s say you’ve deployed a alembic with an associated cronjob and you appetite to watch for it. To do that, you’d affair the command:
The achievement of that command will accommodate a active account of every deployed job (Figure C).
I accept a cardinal of created jobs that accept run, acknowledgment to cronjob.
To end that watch, use the Ctrl C combination.
Deleting a cron-scheduled job is absolutely simple. To do this, affair the command:
Where NAME is the name acclimated in the metadata area of the YAML file.
And that’s the basis of application cronjob to agenda distinct and alternating tasks to your Kubernetes cluster. This simple apparatus can go a continued way to accomplish your Kubernetes admin job a bit easier. Give it a go and see if you don’t wind up authoritative use of cronjob added and more.
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