Time Zone in CronJobs

[Maciej Szulik]

Hey,

I was recently made aware (1, 2) that some of our users started relying

on an implementation detail that slipped in during upgrading our

cron parsing library. That is, it's possible to set time zone for a

cron job through CRON_TZ variable preceding the schedule spec.

I've added the topic for tomorrow's (Nov 15th) sig apps call, during

which we'll decide how to proceed with this topic. If this is something

you have interest in, feel free to join the call at 6pm CET / 12pm EST / 9am PST.

Maciej

[1] https://github.com/kubernetes/website/pull/30021

[2] https://github.com/kubernetes/kubernetes/pull/104404

[Maciej Szulik]

Following up on the conversations from yesterday's sig-apps call

(see notes - [1] and recording [2]). The outcome of the discussion

is that we've decided to not break users that started using that

feature. We'll update our docs with warnings that this feature is

not supported and not recommended for production use, since it

relies on the implementation detail. I've created a PR to the controller

which will add appropriate warning [3]. I'll try to put together a blog

post describing and apologizing for the situation and explaining

next steps.

Finally, I'm planning on picking up the feature work to add proper

time zone support for cron jobs in the next release, so that we can

point users to a supported solution.

Maciej

[1] https://docs.google.com/document/d/1LZLBGW2wRDwAfdBNHJjFfk9CFoyZPcIYGWU7R1PQ3ng/edit#heading=h.3yjuewiste6r

[2] https://youtu.be/1Hmw3zEzSqM

[3] https://github.com/kubernetes/kubernetes/pull/106455

[Clayton Coleman]

Will we warn users?  Can we warn users?

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[Maciej Szulik]

On Tue, Nov 16, 2021 at 5:05 PM Clayton Coleman <ccol...@redhat.com> wrote:

Will we warn users?  Can we warn users?

Yes, Jordan pointed me to a warning mechanism [1], I've updated my PR

with appropriate warnings during both creation and updates of cronjob.

I've just submitted [2] and will update my PR with pointers to that doc.

[1] https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1693-warnings

[2] https://github.com/kubernetes/website/pull/30509