[slurm-users] X11 forwarding and VNC?

Nathan Harper nathan.harper at cfms.org.uk
Fri Mar 22 13:57:31 UTC 2019

The hacky workaround is to 'ssh -X' back into the node before running the
srun, so you appear as if you are remote even if you aren't.

ssh -X loginnode01
ssh -X loginnode01
srun --x11=first bash

On Fri, 22 Mar 2019 at 13:48, Loris Bennett <loris.bennett at fu-berlin.de>

> Hi,
> I'm using 18.08.6-2 and have got X11 forwarding working using the
> in-built mechanism.  This works fine for users who log in with 'ssh -X'
> and then do 'srun --x11 --pty bash'.
> However, I have users who start a VNC session on the login node and when
> they run the srun command above from an xterm within the VNC session,
> they get
>   srun: error: Cannot forward to local display. Can only use X11
> forwarding with network displays.
> Does anyone have any ideas whether this can be made to work and, if so,
> how?
> Cheers,
> Loris
> --
> Dr. Loris Bennett (Mr.)
> ZEDAT, Freie Universit├Ąt Berlin         Email loris.bennett at fu-berlin.de

*Nathan Harper* // IT Systems Lead

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