[slurm-users] x11 forwarding not available?

[Olivier Sallou]

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-bounces at lists.schedmd.com> on behalf of Dave Botsch <botsch at cnf.cornell.edu>
>> Sent: Monday, October 15, 2018 5:51 PM
>> To: slurm-users at 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
>> botsch at cnf.cornell.edu
>> ********************************
>> --
>> ********************************
>> David William Botsch
>> Programmer/Analyst
>> @CNFComputing
>> botsch at cnf.cornell.edu
>> ********************************
>>

-- 
Olivier Sallou
Univ Rennes, Inria, CNRS, IRISA
Irisa, Campus de Beaulieu
F-35042 RENNES - FRANCE
Tel: 02.99.84.71.95

gpg key id: 4096R/326D8438  (keyring.debian.org)
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