Hi, Am 08.06.2020 um 17:16 schrieb Durai Arasan:
> we are setting up a slurm cluster and are at the stage of adding ssh keys of > the users to the nodes. > > I thought it would be sufficient to add the ssh keys of the users to only the > designated login nodes. But I heard that it is also necessary to add them to > the compute nodes as well for slurm to be able to submit jobs of the users > successfully. Apparently this is true especially for MPI jobs. > > So is it true that ssh keys of the users must be added to the > ~/.ssh/authorized_keys of *all* nodes and not just the login nodes? Instead of doing this for each and every user in the cluster, you can also implement hostbased authentication. I put some notes here: https://arc.liv.ac.uk/SGE/howto/hostbased-ssh.html Note: inside the cluster each node is a source and/or target machine depending the parallel library, hence both steps must be done. But often the nodes are having an identical image on all nodes anyway. Sure, the login node is a solely a source machine. Note: I found that with an update of the SSH package the changed permissions bits for /usr/lib64/ssh/ssh-keysign might also get reset, if it's not working after an `rpm -U ssh`, check this flag. -- Reuti
