Hi, On Wed, Feb 29, 2012 at 09:09:27PM +0000, Denver Smith wrote: > > Hello, > On my cluster running moab and torque, I cannot ssh without a password > between compute nodes. I can however request multiple node jobs fine. I > was wondering if passwordless ssh keys need to be set up between > compute nodes in order for mpi applications to run correctly. > Thanks
No. passwordless ssh keys are not needed. In fact, I strong advise against using those (teaching users how to generate passwordless ssh keys creates security problems: they start using those not just for connecting to compute nodes). There are several alternatives: 1) use openmpi's hooks into torque (use the --with-tm configure option); 2) use ssh hostbased authentication (and set IgnoreUserKnownHosts to yes); 3) use rsh (works if your cluster is sufficiently small). I prefer any of these (in decreasing order) over passwordless ssh keys. Cheers, Martin -- Martin Siegert Simon Fraser University Burnaby, British Columbia
