Jailed periodic daily scripts smashing CPU

[Guy TABRAR]

What about:

@daily sleep ${RANDOM:0:2}m ; /some/cron/job.sh

Which gives you a jitter of up to 99 minutes.

Cheers,

Guy

-----Original Message-----
From: owner-freebsd-stable at freebsd.org [mailto:owner-freebsd-stable at freebsd.org] On Behalf Of Miroslav Lachman
Sent: 17 February 2017 01:20
To: Dustin Wenz; freebsd-stable at freebsd.org
Subject: Re: Jailed periodic daily scripts smashing CPU

Dustin Wenz wrote on 2017/02/16 22:47:
> I have a number of servers with roughly 60 jails running on each of 
> them. On these hosts

60 is way more than we have on our jailers. Daily / security scripts are very disk IO intensive so we end up with changing time in /etc/crontab in each jail for periodic tasks.

The best way is to randomize these times on jail creation time.

Miroslav Lachman
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