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arrowHome arrow Linux Tuesday, 19 September 2017  

centos.png The CAT provides a supported Linux desktop based on the Ubuntu distribution.

All users in Maseeh College have access to a central Linux system ( CS students, in addition, have access to the CS Linux Lab.

Faculty and researchers who wish to use our supported Ubuntu loads can pick from our Tiered Offerings.

Contact if you are interested.

Automated killing of X/VNC Sessions Print
Written by Janaka Jayawardena   
Thursday, 12 January 2017

[This only applies to our Linux users with graphical sessions. Regular remote logins to a shell using ssh are not affected.]

Our automated termination of idle VNC/X sessions has been in place for many years. As of Fall 2016, we also introduced automatic termination of Linux workstation logins deemed to be idle. Here is what our current set of controls looks like:

Linux Lab Workstations

Any workstation login session idle for over 3 hours will be terminated. The affected workstation session receives a popup warning window that is displayed on the desktop 10 minutes before the session is terminated. Idle implies no X server user input.


CS Linux lab workstations

FAB 55-17 Linux workstations

ECE VLSI Lab workstations

VNC/X termination

All remotely established VNC/X sessions that are idle for over 48 hours are terminated. Idle implies no X server user input.


ECE: eve, walle, mo, velocesolo

CS: ada, babbage, CS Linux lab systems

MCECS: ruby, rita, FAB 55-17 Linux workstations

We find that many users forget to log off when leaving the labs, resulting in locked workstations. We also find that many VNC/X users will not re-attach to their old sessions, starting new ones instead. These control measures have been taken to ensure availability of resources to all the users of these systems.


These controls are not in effect on research-focused compute servers or desktops.

If you are planning on running long running un-attended sessions using either of these graphical desktop based environments, learn about the guidelines for running them at:

and then contact the CAT for consultation and approval if your use requires it. (Approval is based on resource consumption and non-peak-time use.)

Last Updated ( Thursday, 12 January 2017 )

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