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<p class="MsoNormal"><span style="color:#1F497D">As always, I forgot the attached file.
</span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Vienne, Jerome <br>
<b>Sent:</b> Tuesday, June 12, 2018 12:31 PM<br>
<b>To:</b> 'slurm-users@lists.schedmd.com' <slurm-users@lists.schedmd.com><br>
<b>Subject:</b> Proposed changes to pam_slurm_adopt<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">While testing pam_slurm_adopt with multiple jobs running on the node with Centos7, I realized that it was failing with error messages like:<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:57:37 server pam_slurm_adopt[86395]: From 192.168.1.48 port 36512 as test1234: unable to determine source job<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:57:37 server pam_slurm_adopt[86395]: Couldn't stat path '/cgroup/memory/slurm/uid_1002/job_104'<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:57:37 server pam_slurm_adopt[86395]: Couldn't stat path '/cgroup/memory/slurm/uid_1002/job_105'<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:57:37 server pam_slurm_adopt[86395]: Couldn't stat path '/cgroup/memory/slurm/uid_1002/job_106'<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:57:37 server pam_slurm_adopt[86395]: Couldn't stat path '/cgroup/memory/slurm/uid_1002/job_107'<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As explained in the documentation of the plugin, I knew that I had to change the subsystem in the function _inderterminate_multiple() and change “memory” by “cpuset’ for my case.<o:p></o:p></p>
<p class="MsoNormal">But I am not a fan of hard-coded things, so I decided to modify the plugin to accept a new option that I called “cgoup_subsystem”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To select the subsystem used by slurm/cgroup, just set the value of subsystem after pam_slurm_adopt.so in /etc/pam.d/sshd, for example:<o:p></o:p></p>
<p class="MsoNormal">account sufficient pam_slurm_adopt.so subsystem=cpuset
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If nothing is set, the default subsystem is memory like before.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After that and with the proposed modifications, everything was working as expected:<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:59:14 server pam_slurm_adopt[86610]: From 192.168.1.48 port 36644 as test1234: unable to determine source job<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:59:14 server pam_slurm_adopt[86610]: action_unknown: Picked job 116<o:p></o:p></p>
<p class="MsoNormal">Jun 12 11:59:14 server pam_slurm_adopt[86610]: Process 86610 adopted into job 116<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am attaching the modified version. I believe that it will be useful for some people and might be added to the next version of pam_slurm_adopt.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Jerome Vienne<o:p></o:p></p>
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