[slurm-users] X11 forwarding and VNC?

Christopher Benjamin Coffey Chris.Coffey at nau.edu
Fri Mar 22 19:00:35 UTC 2019


Glad you've made some progress.

We finally got it working as well, and have two findings:

1. the login node fqdn must be the same as the compute nodes

2. --x11 is not required to be added to srun and actually causes it to fail for some reason for us. Very odd, anyone have thoughts?
- Note without --x11, x11 apps fire up perfectly with srun assuming client is forwarding X11 packets

3. salloc works fine too without --x11, subsequent srun with a x11 app works great


Christopher Coffey
High-Performance Computing
Northern Arizona University

On 3/22/19, 6:46 AM, "slurm-users on behalf of Loris Bennett" <slurm-users-bounces at lists.schedmd.com on behalf of loris.bennett at fu-berlin.de> wrote:

    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,
    Dr. Loris Bennett (Mr.)
    ZEDAT, Freie Universität Berlin         Email loris.bennett at fu-berlin.de

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