'Meaning of H/5 in cron Jenkins
I have a job with as cron:
5 3,21 * * 1-5
This will run my job at 03:05AM and 09:05PM. Now I read it's a best practice to use H
.
I try:
H/5 3,21 * * 1-5
What is the meaning now? Will this schedule a build in a range of 5 minutes or 5 minutes after 3AM and 21PM?
Solution 1:[1]
The H
will take a numeric hash of the Job name and use this to ensure that different jobs with the same cron settings do not all trigger at the same time. This is a form of Scheduling Jitter
H/5
in the first field means Every five minutes starting at some time between 0 and 4 minutes past the hour
So H/5 3,21 * * 1-5
is Every five minutes between 03:00 and 03:59 and then between 21:00 and 21:59 on Mon -> Fri but starting at some 'random' time between 03:00 and 03:04 and then the same number of minutes after 21:00
If you want to run once per hour between 03:00-03:59 and 21:00-21:59 on Mon -> Fri, you can use H 3,21 * * 1-5
where H
will be replaced by some number between 0-59 depending on job name.
The user interface will tell you when the job will last have triggered and will next trigger
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
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Solution 1 |