[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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