[ale] too many logins

[Boris Borisov]

Disable shutdown-reboot for non root users maybe !

On Tuesday, November 11, 2014, Todor Fassl <fassl.tod at gmail.com> wrote:

> The biggest problem is that the login screen gets crowded with the names
> of other users who have logged in recently. Students don't see the box to
> enter a different user ID so they reboot the machine which kills off any
> matlab or sage jobs somebody else might have started. After a reboot, the
> login screen has maybe one or two names on it. There must be some fairly
> complex algorithm for determining who gets on that list because I cannot
> see a pattern.
>
>
>
> On 11/11/2014 12:15 PM, Ed Cashin wrote:
>
>> I was reading kind of fast, but I'm not sure you pointed out any
>> specific ill effects.  I'd expect the kernel to page to disk the pages
>> in RAM associated with the unused sessions.  So once all the matlab
>> state (etc.) is on the swap partition, there'd be little cost associated
>> with a stale login as long as you have plenty of swap space.  Maybe
>> everything is already fine now?
>>
>> On Tue, Nov 11, 2014 at 11:55 AM, Todor Fassl <fassl.tod at gmail.com
>> <mailto:fassl.tod at gmail.com>> wrote:
>>
>>     Suggestions?
>>
>>
>>
>>
>>     On 11/11/2014 10:47 AM, JD wrote:
>>
>>         Is there a question?
>>
>>         On 11/11/2014 11:32 AM, Todor Fassl wrote:
>>
>>             I have a problem in a lab I am responsible for. The lab has
>>             7 debian stable
>>             machines. Students log in to check mail, browse the web,
>>             etc. But they
>>             frequently walk away without logging out. Soon enough, the
>>             screen saver comes on
>>             and the next person sits down and logs in as another user.
>>             Often, the first
>>             person comes back hours late or the next day and logs in a
>>             second time. Some of
>>             these machines have the same user logged in 5 or 6 times.
>>
>>             The problem is that some of these students start matlab,
>>             sage, or magma jobs
>>             before they walk away from the workstation. Those are
>>             legitimate jobs and should
>>             not be killed.  In fact, sometimes students ssh to these
>>             machines and run
>>             computations. It's kind of a bad idea but I'd rather not
>>             tell them not to do
>>             that. Otherwise, I'd just have the machines reboot
>>             themselves every  night.
>>
>>             We used to use a tool called timeoutd but it seems to have
>>             been removed from the
>>             debian stable and ubuntu archives.  I was never able to get
>>             it to work right
>>             anyway. Students would complain that their jobs had been
>>             killed or that they
>>             were logged out while they were typing away. At the same
>>             time, I could see that
>>             other users were still logged in after days/weeks of
>>             inactivity. I am not sure
>>             the problem really was with timeoutd because finger often
>>             gave me weird
>>             results.I'm not sure linux was giving timeoutd correct data
>>             to work with.
>>
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>>
>>
>> --
>>    Ed Cashin <ecashin at noserose.net <mailto:ecashin at noserose.net>>
>>
>>
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