Make sure you're using RSA keys in users' accounts -- we'd started setting-up ECDSA on-cluster keys as we built our latest cluster but libssh at that point didn't support them. And since the Slurm X11 plugin is hard-coded to only use ~/.ssh/id_rsa, that further tied us to RSA. It would be nice for the host and user key files to be configurable options; more configurable options for that plugin in general would be useful.
> On Oct 16, 2018, at 4:47 AM, Tina Friedrich <tina.friedr...@it.ox.ac.uk> > wrote: > > 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 > :::::::::::::::::::::::::::::::::::::::::::::::::::::: Jeffrey T. Frey, Ph.D. Systems Programmer V / HPC Management Network & Systems Services / College of Engineering University of Delaware, Newark DE 19716 Office: (302) 831-6034 Mobile: (302) 419-4976 ::::::::::::::::::::::::::::::::::::::::::::::::::::::
