[slurm-users] Slurm 19.05 X11-forwarding

Fri Feb 28 14:57:16 UTC 2020

Hi Pär,

yes , you can -v or e.g. -vvv together with srun. I'm not sure, though, 
if taht shows anything X11-related, but you might try.

Best
Marcus

On 2/28/20 3:45 PM, Pär Lundö wrote:
>
> Hi everyone
>
> Thank you for your support.
> I’ve done a few changes and done some further testing but it has not 
> solved my problem.
> Regardless of the settings for the sshd I can’t get it to
> I am able to use SSH to the node directly along with ”-X”-argument and 
> get the X11 forwarding to work.
> Is there a debug output from srun to retrieve during the connection to 
> the node?
> (Surely the simple answer to that is yes! I’ll try and locate that 
> debug-function, or can someone help with that?)
>
> Best regards,
> Pär Lundö
>
>
> ------------------------------------------------------------------------
> *From:* "slurm-users" <slurm-users-bounces at lists.schedmd.com>
> *Sent:* 27 feb. 2020 12:29
> *To:* "Slurm User Community List" <slurm-users at lists.schedmd.com>
> *Subject:* Re: [slurm-users] Slurm 19.05 X11-forwarding
>
> Hi Sean,
>
> Thank you for your reply.
>
> I will test it asap.
>
> Best regards,
>
> Pär Lundö
>
> *From:*slurm-users <slurm-users-bounces at lists.schedmd.com> *On Behalf 
> Of *Sean Crosby
> *Sent:* den 27 februari 2020 10:26
> *To:* Slurm User Community List <slurm-users at lists.schedmd.com>
> *Subject:* Re: [slurm-users] Slurm 19.05 X11-forwarding
>
> I remember that we had to add this to our /etc/ssh/sshd_config to get 
> X11 to work with Slurm 19.05
>
> X11UseLocalhost no
>
> We added this to our login nodes (where users ssh to), and then 
> restarted the ssh server. You would then need to log out and log back 
> in with X11 forwarding again.
>
> Sean
>
> --
> Sean Crosby | Senior DevOpsHPC Engineer and HPC Team Lead
> Research Computing Services | Business Services
> The University of Melbourne, Victoria 3010 Australia
>
> On Wed, 26 Feb 2020 at 20:52, Pär Lundö <par.lundo at foi.se 
> <mailto:par.lundo at foi.se>> wrote:
>
>     Hi,
>
>     Thank you for your quick replies.
>     Please bear with me as I am a newbie regarding Slurm and Linux.
>     My hostname is not a FQDN and I´m running Slurm on a local node
>     (slurmctld and slurmuser are the same) just to verify that the
>     X11-forwarding is working (amongst other things).
>     The output of "xauth list" is as follows:
>     "
>     parlun-E6540/unix:  MIT-MAGIC-COOKIE-1
>     bcf263421d143e6ba3297dfe926c68b8
>     #ffff#7061726c756e2d4536353430#:  MIT-MAGIC-COOKIE-1
>     bcf263421d143e6ba3297dfe926c68b8
>     "
>     I seem to be missing any ":0", i.e. to wich display or Xserver my
>     user (parlun-E6540) uses?
>     I´ve tried adding the user "slurm", who is designated slurmuser,
>     via "xhost +SI:localuser:slurm" but I still get the error stating
>     that the magic cookie could not be retrieved.
>
>     You are correct, X11Parameters only holds one option
>     "home_xauthority".
>     Does this setting automatically search in the "/home/slurm"-dir
>     for the Xauthority-file? (Given that the slurmuser is "slurm").
>     Trying to locate the storage where xauthoriy is present, I do not
>     find it my home-dir instead it is in some other OS-dir.
>
>     Searching for additional help I came across a debian package
>     (xvfb) for virtual framebuffers. i.e. video/GUI is sent to a
>     virtual buffer instead of a physical display. Anyone tried that?
>     I haven´t not yet installed it, but is curious if that´s a way to go.
>
>     Best regards,
>     Pär Lundö
>
>     -----Original Message-----
>     From: slurm-users <slurm-users-bounces at lists.schedmd.com
>     <mailto:slurm-users-bounces at lists.schedmd.com>> On Behalf Of Ryan
>     Novosielski
>     Sent: den 25 februari 2020 21:23
>     To: slurm-users at lists.schedmd.com
>     <mailto:slurm-users at lists.schedmd.com>
>     Subject: Re: [slurm-users] Slurm 19.05 X11-forwarding
>
>     -----BEGIN PGP SIGNED MESSAGE-----
>     Hash: SHA1
>
>     I seem to remember there being a config option to specify
>     rewriting the hostname as well. I thought it was part of
>     X11Parameters, but I only see one option there:
>
>     https://slurm.schedmd.com/archive/slurm-19.05-latest/slurm.conf.html
>
>     On 2/25/20 10:55 AM, Tina Friedrich wrote:
>     > 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
>     <mailto: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
>     <mailto: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>
>     >>>
>     >>>
>     >>
>
>     - --
>      ____
>      || \\UTGERS,  |----------------------*O*------------------------
>      ||_// the State  |    Ryan Novosielski - novosirj at rutgers.edu
>     <mailto:novosirj at rutgers.edu>
>      || \\ University | Sr. Technologist - 973/972.0922 ~*~ RBHS Campus
>      ||  \\    of NJ  | Office of Advanced Res. Comp. - MSB C630, Newark
>           `'
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>

-- 
Marcus Wagner, Dipl.-Inf.

IT Center
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Fax: +49 241 80-624383
wagner at itc.rwth-aachen.de
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