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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">HI Jeremy,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I have just gone through setting this up with exactly the same issues. Not sure what your settings are or what you may have so far tried, but hopefully this will help…<o:p></o:p></span></p>
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<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">Make usre Slurm > V17.11 (looks like when X forwarding was brought in instead of using SPANK plugin)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">Make sure Slurm is compiled with
</span><span lang="EN-US">libssh2-dev libraries available – not sure if this is the right dependency or if it is required, but I read it somewhere (which I now can’t find the link)…</span><span style="mso-fareast-language:EN-US"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">Add “x11” to the PrologFlags line in slurm.conf – my line looks like “PrologFlags=x11”<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">Add a new line in slurm.conf – “X11Parameters=home_xauthority”<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">Update your slurm cluster and restart.<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Steps 3&4 seemed to be the key ones I originally missed – especially 4 (<a href="https://slurm.schedmd.com/slurm.conf.html#OPT_X11Parameters">https://slurm.schedmd.com/slurm.conf.html#OPT_X11Parameters</a>)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hope that helps and good luck!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Stuart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> slurm-users <slurm-users-bounces@lists.schedmd.com>
<b>On Behalf Of </b>Jeremy Fix<br>
<b>Sent:</b> 07 December 2021 14:05<br>
<b>To:</b> slurm-users@lists.schedmd.com<br>
<b>Subject:</b> [slurm-users] Failed to forward X11 with a remote scheduler<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#212121">You don't often get email from
<a href="mailto:jeremy.fix@centralesupelec.fr">jeremy.fix@centralesupelec.fr</a>.
<a href="http://aka.ms/LearnAboutSenderIdentification">Learn why this is important</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.0pt;background:#FFEB9C"><span style="font-size:10.0pt;color:#9C6500">[EXTERNAL SENDER]</span><span style="font-size:10.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>Hi, <o:p></o:p></p>
<p>I'm unsuccessful in running an X11 application with a remote SlurmctldHost. Let us call myfrontalnode the node from which the user is running the slurm commands that is different from the host SlurmctldHost.<o:p></o:p></p>
<p>What fails is the following :<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>ssh -X myfrontalnode<o:p></o:p></p>
<p>srun --x11 xclock<o:p></o:p></p>
</blockquote>
<p>which returns a "Can't open display: localhost:56.0"<o:p></o:p></p>
<p>If I run the xclock with a ssh -X on the compute node (even the same allocated by slurm with the above srun), it works. Namely, the following works :<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>ssh -X myfrontalnode<o:p></o:p></p>
<p>ssh -X mycomputenode xclock<o:p></o:p></p>
</blockquote>
<p>The xclock is correctly displayed on my local host;<o:p></o:p></p>
<p>Also, If I connect to the SlurmctldHost and then srun --x11 it works as well. I believe there is something I did not configure correctly on the myfrontalnode.<o:p></o:p></p>
<p>Thank you for your help;<o:p></o:p></p>
<p class="MsoNormal">Jeremy. <o:p></o:p></p>
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