topic Re: How do I schedule an alert to run every 12 hours? in Alerting

How do I schedule an alert to run every 12 hours?

vrmandadi — Tue, 01 Sep 2015 18:19:17 GMT

I'm creating an alert.
How can I schedule it to run two times every day?
every 12 hours

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Tue, 01 Sep 2015 18:25:55 GMT

Two times a day, select cron schedule in alert.
0 3,15 * * * ? - That'll run a job at 3am and 3pm. That's twice a day, with 12 hours between.
You could use 0 0/12 * * * ? which means every 12 hours.

Re: How do I schedule an alert to run every 12 hours?

vrmandadi — Tue, 01 Sep 2015 18:27:16 GMT

should I leave the earliest and latest columns blank

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Tue, 01 Sep 2015 18:31:13 GMT

that depends on the alert sampling, what is the time range you are doing it for. It has no relation with the cron schedule.
Please provide more information on your alert.

Re: How do I schedule an alert to run every 12 hours?

vrmandadi — Tue, 01 Sep 2015 18:36:51 GMT

i want to run at 12 am and 12 pm

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Tue, 01 Sep 2015 18:40:49 GMT

0 0 00/12 * * * - Use this in the cron

Re: How do I schedule an alert to run every 12 hours?

vrmandadi — Tue, 01 Sep 2015 18:42:06 GMT

i tried using your example it says invalid cron

Re: How do I schedule an alert to run every 12 hours?

vrmandadi — Wed, 02 Sep 2015 17:22:23 GMT

I used this and it worked
0 */12 * * *

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Wed, 02 Sep 2015 17:26:32 GMT

awesome 🙂

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Wed, 02 Sep 2015 17:27:58 GMT

Not sure why you voted my answer down, "0 /12 " was in my initial solution.

Re: How do I schedule an alert to run every 12 hours?

martin_mueller — Wed, 02 Sep 2015 19:01:14 GMT

The answer should be amended - 0 0 3,15 * * is "every 3rd and 15th day of every month, do something at midnight".

The second expression is invalid because the day of month starts with 1, not 0.

Re: How do I schedule an alert to run every 12 hours?

jensonthottian — Wed, 02 Sep 2015 19:07:23 GMT

Agreed, sorry for the typo

it should be -- 0 3,15 * * * -- for 3am and 3pm everyday of every month.

-- 0 */12 * * * -- which means every 12 hours.