I had an issue getting x11 forwarding via SLURM (srun/sbatch) to work; ssh worked fine. Tracked it down to the host name setting on the nodes; as per RedHat/CentOS default, the hostname was set to the fully qualified. Turns out SLURMs X11 forwarding doesn't work with that; setting the hostnames to the short hostname made it all magically work.
Tina On Tuesday, 16 October 2018 09:29:01 BST Olivier Sallou wrote: > On 10/16/2018 01:07 AM, Dave Botsch wrote: > > Hi. > > > > X11 forwarding is enabled and works for normal ssh. > > I faced same issue, with ssh x11 working as expected on compute nodes, > but not with slurm -x11. > > I patched slurm locally to make it work. > > what you can try to see if it is the same issue: > > > srun -n1 --pty --x11 --pty bash > > > # xterm > // you should have an authorization failure error > > // on connected node > # xauth list > > you will have a list of MAGIC COOKIE like > > myslurmmaster/unix:10 MIT-MAGIC-COOKIE-1 YYYYYY > myslurmnode/unix:52 MIT-MAGIC-COOKIE-1 XXXXXX > > # echo $DISPLAY > localhost:52.0 > > > To make it work manually I did (of course adapting node names and > display port number): > > xauth remove myslurmnode/unix:52 > xauth add localhost:52.0 > > then xterm (for example) worked. > > If this is the same problem, slurm can be easilly patched to work (can > give you how) > > Olivier > > > Thanks. > > > > On Mon, Oct 15, 2018 at 09:55:59PM +0000, Rhian Resnick wrote: > >> Double check /etc/ssh/sshd_config allows X11 forwarding on the node as it > >> is disable by default. (I think) > >> > >> > >> X11Forwarding yes > >> > >> > >> > >> > >> Rhian Resnick > >> > >> Associate Director Research Computing > >> > >> Enterprise Systems > >> > >> Office of Information Technology > >> > >> > >> Florida Atlantic University > >> > >> 777 Glades Road, CM22, Rm 173B > >> > >> Boca Raton, FL 33431 > >> > >> Phone 561.297.2647 > >> > >> Fax 561.297.0222 > >> > >> [image] <https://hpc.fau.edu/wp-content/uploads/2015/01/image.jpg> > >> > >> ________________________________ > >> From: slurm-users <slurm-users-boun...@lists.schedmd.com> on behalf of > >> Dave Botsch <bot...@cnf.cornell.edu> Sent: Monday, October 15, 2018 5:51 > >> PM > >> To: slurm-users@lists.schedmd.com > >> Subject: [slurm-users] x11 forwarding not available? > >> > >> > >> > >> Wanted to test X11 forwarding. X11 forwarding works as a normal user > >> just ssh'ing to a node and running xterm/etc. > >> > >> With srun, however: > >> > >> srun -n1 --pty --x11 xterm > >> srun: error: Unable to allocate resources: X11 forwarding not available > >> > >> So, what am I missing? > >> > >> Thanks. > >> > >> PS > >> > >> srun --version > >> slurm 17.11.7 > >> > >> rpm -qa |grep slurm > >> ohpc-slurm-server-1.3.5-8.1.x86_64 > >> ... > >> > >> > >> -- > >> ******************************** > >> David William Botsch > >> Programmer/Analyst > >> @CNFComputing > >> bot...@cnf.cornell.edu > >> ******************************** > >> -- > >> ******************************** > >> David William Botsch > >> Programmer/Analyst > >> @CNFComputing > >> bot...@cnf.cornell.edu > >> ******************************** -- Tina Friedrich, Snr HPC Systems Administrator, Advanced Research Computing Research Computing and Support Services, Academic IT IT Services, University of Oxford http://www.arc.ox.ac.uk
