Problems with periodic scripts in jails [Cron <operator@sosai> /usr/libexec/save-entropy]

Josef Karthauser joe at
Wed Jun 2 19:09:47 GMT 2004

On Thu, Jun 03, 2004 at 01:32:07AM +1000, Bruce Evans wrote:
> > Ok, I've found the cause of the problem.  Cron is spawning
> > more than one copy of the entropy script...
> Cron has been filling my mailbox with complaints about this for years.
> (I only partially filled the mailbox of the author of the entropy
> script with complaints about it 3 or 4 times :-).  In my case, the
> multiple crons are caused by /usr being nfs-mounted and the server
> being down.  cron forks OK, but each copy blocks waiting for something
> in /usr.  When the server comes back up, a thundering herd of entropy
> scripts run and clobber each others' rotation of the entropy files.
> Cron normally runs the entropy script every 11 minutes, so the herd
> grows quickly.  The herd (or perhaps other herds) also exhausts pipe
> kva on machines with small amounts of RAM (64M) while waiting.

In my case however cron is consistently executing TWO copies of
everything at the same time.  What kind of wierdness is that?
(Something jail related... what?)

Josef Karthauser (joe at
FreeBSD (cvs meister, admin and hacker)
Physics Particle Theory (student)
================ An eclectic mix of fact and theory. =================
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