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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?
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'H' is used in the Jenkins continuous integration system to indicate that a "hashed" value is substituted. Thus instead of '20 * * * *' which means at 20 minutes after the hour every hour, 'H * * * *' indicates that the task is performed every hour at an unspecified but invariant time.
0 * * * * -this means the cron will run always when the minutes are 0 (so hourly) 0 1 * * * - this means the cron will run always at 1 o'clock. * 1 * * * - this means the cron will run each minute when the hour is 1.
Syntactically, CRON contains 5 places for each time entry, thus a conventional one-liner syntax of the CRON template would be somehow like: Copy Code. 0 23 * * * // Staged as {Minute} {Hour} {DayOfMonth} {Month} {DayofWeek} Minute (0-59) – tells at what minute of the hour the Job should build.
Asterisk (*).Use this operator to signify all possible values in a field. For example, if you want your cron job to run every minute, write an asterisk in the Minute field.
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.
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
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