[Beowulf] SSH without login in nodes

[Chris Samuel]

On Sun, 6 May 2007, Kilian CAVALOTTI wrote:

> Not that ugly, actually. But what if users do a
> ssh node -t "bash --noprofile"? ;) 

Then if any of the 500 odd tried we would spot them with some other scripts 
and chase them about it.   We've not had to do that yet, though, fortunately!

> To handle of SSH based MPI launchers, we've disabled user logins from our
> frontend node to the compute nodes, but allowed them between compute
> nodes. So that the scheduler takes care of dispatching the initial process
> on a first node (no SSH involved), and then SSH connections can be used to
> dispatch the MPI daemons on the other nodes, from the initial one.

Now that there's the Torque PAM module (pam_pbssimpleauth) that Garrick wrote 
I'm tempted to set that up, but given our current system works I haven't 
dared break it.  :-)

cheers!
Chris
-- 
 Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
 Victorian Partnership for Advanced Computing http://www.vpac.org/
 Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia

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