[CSC 315] CSC315: Booting Linux in Lab 200

[Andrew J. Pounds]

On 09/16/2012 03:45 PM, Paul.A.Mould wrote:
> Dr. Pounds,
>   I am having trouble logging on to my account on Linux in Lab 200. I successfully logged on to my account once. When I logged off and tried to  log back on is says Authentication Failure. How should i reboot Linux in order to log on properly in Lab 200?
>       Regards,
>       Paul Mould

As I mentioned in class the other day, during the evenings after 10 pm 
and on the weekends the computer labs (including lab 200) are doing 
their UNIX authentication using zeus (the head node of the parallel 
computing cluster).  Here is what you need to do to get the machines to 
authenticate off of Blackhawk (the compscience domain).

1. While the machine is doing its initial boot you need to to select 
CentOS (the first option on the list of opearting systems).

2. The machine will then start to boot into linux and you will see a 
blue bar start to be drawn across the bottom of the screen from left to 
right.  When you see this start, hit the Escape key.

3. Hitting Escape should bring you back to a text display that shows you 
all of the drivers and linux kernel modules loading.  Early in this 
sequence you will see the following message come on the screen:

************************************************************
* This system is going to boot into the Olympus Parallel   *
* Computing Cluster domain.  If you want to boot into      *
* the Computer Science domain, hit any key.                *
************************************************************

This is part of a script I wrote years ago that changes a lot of things 
under the hood to change the authentication system and user file systems 
that get mounted. *You have about three seconds to hit any key. * Once 
you do that you should be brought to a normal login screen where your 
cobra login and password should work.

Let me know if you have any problems.


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627

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