[slurm-users] slurm 18.08 - x11 forwarding issue

[Olivier Sallou]

Hi,

I have setup slurm and enabled x11 forwarding (native).

I connect to a node from a submission node:

    srun  --ntasks-per-node=1 --mem 100 --x11 --pty bash

I am connected to the node.

in debug logs, I can see that x11 setup is OK:

...

[2018-10-10T09:27:48.142] [131.extern] X11 forwarding established on
DISPLAY=cl1n015:92.0
[2018-10-10T09:27:48.142] [131.extern] debug:  x11 forwarding local
display is 92
[2018-10-10T09:27:48.142] [131.extern] debug:  x11 forwarding local
xauthority is .../.Xauthority
[2018-10-10T09:27:48.142] [131.extern] debug:  x11 forwarding - sending
keepalive message

...


I have a display assigned:

    bash-4.2$ echo $DISPLAY
    localhost:30.0

and Xauthority is updated:


    bash-4.2$ xauth list
    osallou/unix:11  MIT-MAGIC-COOKIE-1  .....2593f3c305e42754
    slurmmaster/unix:10  MIT-MAGIC-COOKIE-1  ....b654ee70b8ccd7ad176
    ==> cl1n015/unix:30  MIT-MAGIC-COOKIE-1  ...b654ee70b8ccd7ad176


But x11 fails:


    bash-4.2$ xterm
    X11 connection rejected because of wrong authentication.
    xterm: Xt error: Can't open display: localhost:30.0


If I ssh as root to the node with -X flag, the xterm command works as
expected, so this is not a X problem itself.

I do not see any error in system or slurm logs.

Any idea ? I found many issues related to X11 with slurm but could not
find a solution for me.


Thanks

-- 


gpg key id: 4096R/326D8438  (keyring.debian.org)
Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438