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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

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:


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....

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...

Jordi Espasa Clofent

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