Fwd: [Xen-users] NTP service in DomU

[Galevsky <galevsky@xxxxxxxxx>]

---------- Forwarded message ----------
From: Galevsky <galevsky@xxxxxxxxx>
Date: 4 juil. 2007 11:47
Subject: Re: [Xen-users] NTP service in DomU
To: Jordi Espasa Clofent <sistemes.llistes@xxxxxxxxxxxxx>


What's the matter ?

Let's set up your time as UTC, dom0 will keep it updated, then set a
different /etc/localtime file on each of your domU.... no issue here
;o)

But you NEVER need more NTP services, because ntp keep your hardware
clock up-to-date. How many hardware clock(s) do you have on a single
machine ? :o)
Only one of course.

If many domU were able to modify the hardware clock with different
setups (let's imagine a US localtime, a UTC, plus a Japan localtime
domain) your motherboard would burn in a short time ;o)

Let's dom0 deal with that. Then, you want to set different timezones
on many domains, good. It is up to software. I advise you to read that
kind of doc to manage time the way you want:
http://tldp.org/HOWTO/TimePrecision-HOWTO/index.html

Gal'


2007/7/4, Jordi Espasa Clofent <sistemes.llistes@xxxxxxxxxxxxx>:
> Hi folks,
>
> I've tried to mount a NTP service in DomU without success. Even when
> I've use the ntpdate <ntp_server> command directly, it doesn't work.
>
> After several failed attempts I've discovered that domU is
> "automatically" syncronized with dom0. Because the checking has been
> easy: I've sync dom0 with X time and after all domU appears with X time too.
>
> Well... STFW....
> http://lists.xensource.com/archives/html/xen-users/2005-05/msg00159.html
> http://lists.xensource.com/archives/html/xen-users/2005-11/msg00496.html
>
> ÂIt is not possible to build a NTP service in domU which would be
> independent from dom0? According to my own tests, it seems not.
>
> If this issue is true I think it's a big limitation for XEN.
> Âwhat happens if you require to set up your domU with diferent NTP
> services (as clients)?
>
> I'm thinking in several clients I've around the world...
>
> --
> Thanks,
> Jordi Espasa Clofent
>
>
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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