Re: [Condor-users] virtual machines

[Erik Paulson <epaulson@xxxxxxxxxxx>]

On Wed, Jan 05, 2005 at 01:31:45PM -0800, Jacob Joseph wrote:
> Is it possible in the spec file for a user to specify the virtual 
> machine number to run on?  I understand it is possible to specify the 
> machine.
> 

By spec file, do you mean the input file to condor_submit? In Condor,
we usually call that 'the submit file'

But it's easy to say which VM you want to run on

requirements = VirtualMachineID == 2

Though there's usually not a good reason to do so.

> Alternately, is it possible to use arbitrary variables in a spec file 
> that can be checked in a START expression?
> 

Yes. 

In the configuration file for the condor_startd

Requirements = TARGET.Spirit == "Vodka"

And in the submit file, you use the '+' to add new things into the job
classad:

+Sprit = "Vodka"

It works both ways, too.

At the startd, you can add arbitrary expressions to the classad for the
machine:

Requirements = TARGET.Spirit == "Vodka"
Mixer = "Tonic"
# This advertises Mixer into the StartdAd
STARTD_EXPRS = Mixer


Then, in the submit file:
+Spirit = "Vodka"
Requirements = TARGET.Mixer == "Tonic"


Sadly, it's different syntax to get something into the StartD classad 
(STARTD_EXPRS) and the Job Classad (+ in the submit file)

-Erik

> Thanks.
> -Jacob
> _______________________________________________