Jenkins : Scheduling Jenkins Jobs for a specific time

Jenkins uses a cron expression, the different fields are :

  1. MINUTES Minutes in one hour (0-59)
  2. HOURS Hours in one day (0-23)
  3. DAYMONTH Day in a month (1-31)
  4. MONTH Month in a year (1-12)
  5. DAYWEEK Day of the week (0-7) where 0 and 7 are sunday

Since a few versions, Jenkins add a new parameter, H : (extract from the jenkins code documentation)

To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should be used wherever possible.

For example, using 0 0 * * * for a dozen daily jobs will cause a large spike at midnight. In contrast, using H H * * * would still execute each job once a day, but not all at the same time, better using limited resources.

Note also that :

The H symbol can be thought of as a random value over a range, but it actually is a hash of the job name, not a random function, so that the value remains stable for any given project.

Example 1 : H H(3-4) * * *  : A job which runs every Day of the week, every Month in a year , every Day in a month at a time between 3 – 4 am in the morning at any minute.

Example 2 : H (30 -45) 3 * * * : A job which runs every Day of the week, every Month in a year , every Day in a month at 3 am in the morning between 30 -45 minutes.

Example 3 : */5 * * * * : If you want to shedule your build every 5 minutes, this will do the job

Example 4 : 0 8 * * * : schedule your build every day at 8h 00, this will do the job 

Have fun as you work!

See Also: Parameterised Scheduler Plugin

cool-jenkins2x3

Regards,

VJ

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