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Fwd: [Xen-users] NTP service in DomU


  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Galevsky <galevsky@xxxxxxxxx>
  • Date: Wed, 4 Jul 2007 12:44:40 +0200
  • Delivery-date: Wed, 04 Jul 2007 03:42:43 -0700
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---------- 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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