We have our configuration management tools stagger jobs based on stable criteria like the machine ID.
On Wed, Feb 6, 2013 at 1:13 AM, Olav Vitters <[email protected]> wrote: > Feature request: allow to randomly delay a scheduled job > > Why: > I have various cron jobs that run every 20min on various VMs + servers. > All servers are synched with NTP. What happens is that if they use some > shared resource (e.g. an LDAP server), the load spikes on that LDAP > server spikes every 20min. So every 20min the LDAP server is slowish and > afterwards it does nothing again. Not running the jobs at the same exact > time would spread the usage of that server, and likely result is that > the load never spikes anymore. > > It would be nice if I could do the following in systemd: > Run this script every 20min, but randomly delay it by up to 5min. > > Currently I introduce such delays either in the script itself, and > sometimes before calling the script. It would be much nicer to have > a syntax for this. > > Note that the random delay could either be changed for each execution > or determined once per job/unit. I'm not sure which one is better. > Benefit if only determining the random delay once, is that you still get > the same 20min delay each time. On other hand, that is not really random > anymore. > > Different possible random option: > a. Every 20min: 0:00 + 1min 24sec, 0:20 + 3min 21 sec, 0:40 + 0min 48sec > b. Every 20min: 0:00 + 1min 24sec, 0:20 + 1min 24 sec, 0:40 + 1min 24sec > > a. = random every time > b. = delay is random, but then predictable delay > > I'm fine with either btw. > > -- > Regards, > Olav > _______________________________________________ > systemd-devel mailing list > [email protected] > http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- David Strauss | [email protected] | +1 512 577 5827 [mobile] _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
