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Status Not under consideration
Workspace Spectrum LSF
Created by Guest
Created on Dec 18, 2024

Add the Linux PAM support in LSF

See this idea on ideas.ibm.com

Dear all,

we have several applications unable to work properly when they are executed by launching Vnc jobs.

We receive several dbus and dconf error messages which can be traced back to the fact that the directory /run/user/$uid isn’t found.

This lead to a user environment not set and as a consequence the user variables used by applications are missing.  

 Usually, when user logon the host, /run/user/$uid is created by pam_systemd and used for storing files used by running processes for that user. When a user logs out, and no active sessions remain, pam_systemd will remove the /run/user/$uid directory.

As you stated in CASE TS017274952, LSF does not use "ssh" or "rsh" to start jobs. When a job runs on execution host, sbatchd and res do not call pam_systemd by default, so "/run/user/$uid" is not created.

 Our requirement is to have the Linux PAM support in LSF to be able to set properly the user variables used by application launched via Vnc job.

Many thanks in advance for your support and collaboration

Kind regards

Needed By Yesterday (Let's go already!)
  • Guest
    Reply
    |
    Jan 16, 2025

    Indeed, the results obtained by adding session optional pam_systemd.so to /etc/pam.d/lsf were not positive, as you stated. 

    Let me explain better the use case for which we need to set up the environment correctly: Vnc sessions are used as virtual desktops by users. There is a need for the user to login as if he using a 'traditional desktop', hence the need for the dbus configuration to be correctly valued. 

    Currently we are using a template that launches a script that does an SSH and then launches the Vnc session in which the application is executed.

  • Admin
    Bill McMillan
    Reply
    |
    Jan 10, 2025

    When the LSF service starts a job on behalf the user it does not perform an OS login, so pam_login() is not called, and that pam_systemd is not invoked to /run/user/$uid is not created.

    Changing LSF to perform a login() would fundamentally change an established architecture, and is not something we would do.


    As previously discussed, you could add
    session optional pam_systemd.so
    to /etc/pam.d/lsf, but it may result in some other unexpected behaviour as login() has not been called, and not tty would be associated with the session, so may have other issues. Furthermore, you could not use LSF's own cgroup support at the same time.