There are differences for X11 between Slurm versions so it may help to know which version you have.
I tried some of your commands on our slurm 19.05.3-2 cluster, and interestingly on the session on the compute node I don't see the cookie for the login node: This was with MobaXterm: [user@prdubrvm005 ~]$ xauth list prdubrvm005.research.rcsi.com/unix:10 MIT-MAGIC-COOKIE-1 2efc5dd851736e3848193f65d038eca8 [user@prdubrvm005 ~]$ srun --pty --x11 --preserve-env /bin/bash [user@prdubrhpc1-02 ~]$ xauth list prdubrhpc1-02.research.rcsi.com/unix:95 MIT-MAGIC-COOKIE-1 2efc5dd851736e3848193f65d038eca8 [user@prdubrhpc1-02 ~]$ echo $DISPLAY localhost:95.0 Any per-user problem would make me suspect the user having a different shell, or something in their login script. Can you make their .bashrc and .bash_profile just exit? Or look for hidden configuration files for <something> in their home directory? William On Fri, 24 Jan 2020 at 16:05, Simon Andrews <simon.andr...@babraham.ac.uk> wrote: > I have a weird problem which I can’t get to the bottom of. > > > > We have a cluster which allows users to start interactive sessions which > forward any X11 sessions they generated on the head node. This generally > works fine, but on the account of one user it doesn’t work. The X11 > connection to the head node is fine, but it won’t transfer to the compute > node. > > > > The symptoms are shown below: > > > > A good user gets this: > > > > [good@headnode ~]$ xauth list > > headnode.babraham.ac.uk/unix:12 MIT-MAGIC-COOKIE-1 > f04a2bf9a921a3357e44373655add14a > > > > [good@headnode ~]$ echo $DISPLAY > > localhost:12.0 > > > > [good@headnode ~]$ srun --pty -p interactive --x11 --preserve-env > /bin/bash > > > > [good@compute ~]$ xauth list > > headnode.babraham.ac.uk/unix:12 MIT-MAGIC-COOKIE-1 > f04a2bf9a921a3357e44373655add14a > > compute/unix:25 MIT-MAGIC-COOKIE-1 f04a2bf9a921a3357e44373655add14a > > > > [good@compute ~]$ echo $DISPLAY > > localhost:25.0 > > > > So the cookie is copied from the head node and forwarded and the DISPLAY > variable is updated. > > > > The bad user gets this: > > > > [bad@headnode ~]$ xauth list > > headnode.babraham.ac.uk/unix:10 MIT-MAGIC-COOKIE-1 > c39a493a37132d308b37469d363d8692 > > > > [bad@headnode ~]$ echo $DISPLAY > > localhost:10.0 > > > > [bad@headnode ~]$ srun --pty -p interactive --x11 --preserve-env > /bin/bash > > > > [bad@compute ~]$ xauth list > > headnode.babraham.ac.uk/unix:10 MIT-MAGIC-COOKIE-1 > c39a493a37132d308b37469d363d8692 > > > > [bad@compute ~]$ echo $DISPLAY > > localhost:10.0 > > > > So the cookie isn’t copied and the DISPLAY isn’t updated. I can’t see any > errors in the logs and I can’t see anything different about this account. > > > > If I do a straight forward ssh -Y from the head node to a compute node > from the bad account then that works fine – it’s only whatever is specific > about the way that srun forwards X which fails. > > > > Any ideas or suggestions for debugging would be appreciated as I’m running > out of things to try! > > > > Simon. > > The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT > *Registered > Charity No. 1053902.* > > The information transmitted in this email is directed only to the > addressee. If you received this in error, please contact the sender and > delete this email from your system. The contents of this e-mail are the > views of the sender and do not necessarily represent the views of the > Babraham Institute. Full conditions at: www.babraham.ac.uk > <http://www.babraham.ac.uk/terms> >
