CVSROOT: /cvs
Module name: src
Changes by: mill...@cvs.openbsd.org 2023/05/06 17:06:27
Modified files:
usr.sbin/cron : crontab.5 entry.c macros.h
Log message:
Support random offsets when using ranges with a step value in cron.
This extends the random range syntax to support step values. Instead
of choosing a random number between the high and low values, the
field is treated as a range with a random offset less than the step
value. This can be used to avoid thundering herd problems where
multiple machines contact a server all at the same time via cron jobs.
The syntax is similar to the existing range/step syntax but uses a
random range. For example, instead of "0-59/10" in the minutes
field, "0~59/10" can be used to run a command every 10 minutes where
the first command starts at a random offset in the range [0,9].
The high and low numbers are optional, "~/10" can be used instead.
Requested by job@, OK phessler@
