[Beowulf] block runing jobs individually on each node

Reuti reuti at staff.uni-marburg.de
Thu Apr 7 15:23:51 EDT 2005


Jerry,

Quoting jerry xu <jerry at oban.biosc.lsu.edu>:

> Thanks, Reuti:
>    However, I cannot block ssh/rsh completely since there are many
> communications among each node when we run our own program such as input
> and output data from files located at master node.

how do you transfer your files? With a NFS mounted e.g. /home on all nodes, 
there is no need for rsh login (ssh configuration to allow scp but no 
interactive ssh login?). The file-staging with -W should also be possible 
without interactive login then. Parallel jobs with MPI can use mpiexec and 
start also these tasks as children of the pbs_mom on the nodes.

If you need more sophisticated file-staging, you may look at SUN GridEngine 
where you can define prologs/epilogs to do this for the user. And as SGE has 
it's own qrsh as a controlled replacement for rsh, it will also work with PVM, 
Linda... without the usual rsh/ssh.

CU - Reuti

> 
>    I just want to forbid people running any of their own program at each
> node. They are only allowed to submit job through the batch system
> (OpenPBS).
> 
> Sincerely,
> Jerry
> 
> On Thu, 2005-04-07 at 13:34, Reuti wrote:
> > Hi,
> > 
> > disable rsh/ssh completely. Instead have a queue on each node for an 
> > interactive login. This way they will get a bash as child from the pbs_mom,
> and 
> > you can control the maximum runtime.
> > 
> > If you need still ssh for admin usage: limit the access to the conventional
> ssh 
> > in /etc/ssh/sshd_conf to some users:
> > 
> > AllowUsers jerry
> > 
> > Cheers - Reuti
> > 
> > PS: Another solution: set an ulimit for the maximum runtime for an
> interactive 
> > login in /etc/profile.local.
> > 
> > 
> > Quoting jerry xu <jerry at oban.biosc.lsu.edu>:
> > 
> > > Hi, Dear All:
> > >    I am managing a simple 24 nodes beowulf cluster, basically I require
> > > all my jobs are running through PBS. However, some undergraduate
> > > students in our lab always try to ssh to each individual node in the
> > > cluster and run their jobs, which is pretty bad for me to managing the
> > > resources and control my program running status. I remember there is
> way
> > > to block people running job that is seperated from the batch system but
> > > at the same time still allow them ssh to each node to grab some tmp
> > > files?. But I just donot remember how to do it, can anyone give some
> > > directions?
> > > 
> > > Thanks so much,
> > > 
> > > 
> > > Jerry
> > > 
> > > _______________________________________________
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> > > 
> > 
> 


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