Re: [HTCondor-users] peaceful node drain and shutdown

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 7/13/2016 3:03 PM, Bob Ball wrote:
> Maybe this info is now obsolete, but I remember once setting the START
> to an expression that evaluated "FALSE" and caused all the running jobs
> to terminate....
>
> bob

Only if $(START) is referenced in the PREEMPT expression....

START just controls when new jobs can be launched.

PREEMPT controls when to kick off jobs (really would be more accurate to 
have named it "Evict" instead of "Preempt", sigh...).

regards
Todd


> On 7/13/2016 3:56 PM, Fox, Kevin M wrote:
> > I'm guessing the condor_drain command will have similar issues to the
> > condor_off -peaceful command? That you have to have all the
> > permissions setup right?
> >
> > The nice thing about the START=FALSE config trick is you only need
> > root on the machine to do it.
> >
> > Thanks,
> > Kevin
> > ________________________________________
> > From: HTCondor-users [htcondor-users-bounces@xxxxxxxxxxx] on behalf of
> > Todd Tannenbaum [tannenba@xxxxxxxxxxx]
> > Sent: Wednesday, July 13, 2016 12:46 PM
> > To: HTCondor-Users Mail List
> > Subject: Re: [HTCondor-users] peaceful node drain and shutdown
> >
> > On 7/13/2016 2:29 PM, Fox, Kevin M wrote:
> > > Ah. I had seen the docs for START but didn't realize it would affect new
> > > job startup too. It seemed to imply that its for eviction.
> > >
> > > But, the following seems to work to drain the node gracefully, as you
> > > suggested:
> > > echo START=FALSE > /etc/condor/config.d/00shutdown
> > > kill -HUP <PID OF MASTER>
> > >
> > > and to reverse it
> > > rm -f /etc/condor/config.d/00shutdown
> > > kill -HUP <PID OF MASTER>
> > >
> > > Thanks for the help. :)
> > Hi Kevin,
> >
> > If the above satisfies your needs, great.  But just wanted to point out
> > you can do the same thing (drain a node gracefully) with the
> > condor_drain tool.  Do "man condor_drain", or see
> >    http://htcondor.org/manual/v8.4/condor_drain.html
> >
> > Also in the upcoming HTCondor v8.5.6, the condor_drain functionality is
> > exposed via HTCondor's Python API. :)
> >
> > regards,
> > Todd
> >
> >
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--
Todd Tannenbaum <tannenba@xxxxxxxxxxx> University of Wisconsin-Madison
Center for High Throughput Computing   Department of Computer Sciences
HTCondor Technical Lead                1210 W. Dayton St. Rm #4257
Phone: (608) 263-7132                  Madison, WI 53706-1685