[K12OSN] kinit: clock skew too great

Nils Breunese nils at breun.nl
Tue Apr 3 16:30:26 UTC 2007

Terrell Prudé Jr. wrote:

> Nils Breunese wrote:
>> Terrell Prudé Jr. wrote:
>>> Have you done your yum updates?  Have you also checked out that
>>> you're using the new timezone info?  I know, possibly stupid
>>> questions, but even on our network, I found a few stragglers last  
>>> week.
>>> The following is pure conjecture.  If both servers are reading the
>>> same time, but they're using different timezone info, that might be
>>> an issue, since UNIX time is always with respect to UTC (same as
>>> GMT).  That is, the timezone info that you pointed to during your
>>> installation (e. g. EST5EDT) simply tweaks the *real* system
>>> date/time setting to display to you, the human.  However, the system
>>> itself is running on UTC.  I'm not sure if this is the problem, but
>>> that's what I'd check first.
>> It depends, during installation you get to choose whether you want to
>> set your system clock to UTC or not.
> I think you're referring to the oft-called "CMOS clock" in the BIOS.
> My understanding of it is the following.  The installation doesn't ask
> you to *set* that BIOS clock to UTC.  Rather, it asks you if it's
> *already* set to UTC or not, so the system knows how to adjust its
> timezone info in software.  That's a bit different.  When GNU/Linux
> boots, it does get its initial time setting from the BIOS clock.  But
> after it starts up, the system doesn't ask the BIOS what time it is
> anymore.  You're now depending totally on the software to set your  
> time.
> Someone, correct me if I'm wrong here.

I believe you're right.

Nils Breunese.

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