[slurm-users] Slurm 19.05 X11-forwarding

[Tina Friedrich]

I remember having issues when I set up X forwarding that had to do with 
how the host names were set on the nodes. I had them set (CentOS 
default) to the fully qualified hostname, and that didn't work - with an 
error message very similar to what you're getting, if memory serves 
right. 'Fixed' it by setting the hostnames on all my cluster nodes to 
the short version.

What does 'xauth list' give you on your nodes (and the machine you're 
coming from)?

This is/was SLURM 18.08 though, not sure if that makes a difference.

Tina

On 25/02/2020 04:55, Pär Lundö wrote:
> Hi,
>
> Thank you for your reply Patrick.
> I´ve tried that but I still get the error stating that the magic cookie could not be retrieved.
> Reading Tim´s answer, this bug should have been fixed in a release following 18.08, but I´m using 19.05 thus it should have been taken care of?
>
> Best regards,
> Pär Lundö
>
> -----Original Message-----
> From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf Of Patrick Goetz
> Sent: den 24 februari 2020 21:38
> To: slurm-users at lists.schedmd.com
> Subject: Re: [slurm-users] Slurm 19.05 X11-forwarding
>
> This bug report appears to address the issue you're seeing:
>
>     https://bugs.schedmd.com/show_bug.cgi?id=5868
>
>
>
> On 2/24/20 4:46 AM, Pär Lundö wrote:
>> Dear all,
>>
>> I started testing and evaluating Slurm roughly a year ago and used it
>> succesfully with MPI-programs.
>> I have now identified that I need to use X-forwarding in order to make
>> use of an application needed to run a GUI.
>> However I seem not to be able to use the "X11Forwarding" in Slurm.conf
>> with any sucess.
>> A simple test with srun as "srun - -x11 <script-to-start>", yields an
>> error stating:
>> "srun: error: x11_get_xauth: Could not retrieve magic cookie. Cannot
>> use
>> X11 forwarding."
>> I'm guessing that there some additional setting I'm missing out on.
>> Searching through documentation does not reveal anything
>> extraordinary to be performed with the X11-forwarding. I have searched
>> bug-reports and found similiar problems but fixes have been
>> implemented in Slurm-versions prior to the one I am using. In addition
>> users have been reporting that the implementation made by Slurm, now
>> have fixed their issues.
>> I have used the "export=DISPLAY, HOME" as an additional argument for
>> srun but without any progress.
>> Anyone with similiar problem who can aid or advice me on howto use the
>> X11Forward feature?
>> Any help is much appreciated.
>>
>> I am running Slurm 19.05 and Ubuntu 18.10.
>>
>> Best regards,
>> Pär Lundö
>>
>> This message is from an external sender. Learn more about why this
>> matters.
>> <https://ut.service-now.com/sp?id=kb_article&number=KB0011401>
>>
>>
>