Xen virtual machines and ntp

[ESGLinux]

Hello,

I have set as you say.

I´ll be looking if I have problems with the time,

Thanks for your answer

ESG

2009/5/13 Schaffrath, Rene <Rene.Schaffrath at mundipharma.de>

> Hello,
>
> have you tried to set "xen.independent_wallclock=1" in
> /etc/sysctl.conf (activate with sysctl -p).
>
> No time drifting in our domUs - even under very high cpu load...
>
> Hope this helps,
> René
>
>
> > -----Original Message-----
> > From: redhat-list-bounces at redhat.com
> > [mailto:redhat-list-bounces at redhat.com] On Behalf Of ESGLinux
> > Sent: Wednesday, May 13, 2009 9:14 AM
> > To: General Red Hat Linux discussion list
> > Subject: Xen virtual machines and ntp
> >
> > Hi,
> >
> > I´m running a  Xen server with several virtual machines on
> > it. I have a
> > problem with the time of the machines.
> > They unsynchronize very fast (in an hour several seconds). I
> > try to use ntpd
> > to syncronize them but It doesn´t work.
> >
> > I have set up a local ntp server with this ntp.conf:
> >
> > #grep  ^[^#] /etc/ntp.conf
> > restrict default kod nomodify notrap
> > restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
> > server 1.rhel.pool.ntp.org
> > server 2.rhel.pool.ntp.org
> > server 127.127.1.0
> > fudge   127.127.1.0 stratum 10
> > driftfile /var/lib/ntp/drift
> > keys /etc/ntp/keys
> > restrict 1.rhel.pool.ntp.org mask 255.255.255.255 nomodify
> > notrap noquery
> > restrict 2.rhel.pool.ntp.org mask 255.255.255.255 nomodify
> > notrap noquery
> > server hora.roa.es
> > restrict hora.roa.es mask 255.255.255.255 nomodify notrap noquery
> >
> > and the clients like this:
> >
> > restrict default kod nomodify notrap nopeer noquery
> > tinker step 0
> > restrict 127.0.0.1
> > restrict -6 ::1
> > server 192.168.1.1
> > server 0.rhel.pool.ntp.org
> > server 1.rhel.pool.ntp.org
> > server 2.rhel.pool.ntp.org
> > driftfile /var/lib/ntp/drift
> > keys /etc/ntp/keys
> > restrict 0.rhel.pool.ntp.org mask 255.255.255.255 nomodify
> > notrap noquery
> > restrict 1.rhel.pool.ntp.org mask 255.255.255.255 nomodify
> > notrap noquery
> > restrict 2.rhel.pool.ntp.org mask 255.255.255.255 nomodify
> > notrap noquery
> > restrict 192.168.1.1 mask 255.255.255.255 nomodify notrap noquery
> >
> > 192.168.1.1 is the first machine, the one I want to be the
> > ntp local server.
> >
> > the param tinker step 0 I get from this
> > http://wiki.dovecot.org/TimeMovedBackwards
> > My real problem began with dovecot, because if the machine is not well
> > syncronized the dovecot kills itself ( dovecot: Time just
> > moved backwards by
> > 8 seconds. This might cause a lot of problems, so I'll just
> > kill myself now.
> > http://wiki.dovecot.org/TimeMovedBackwards)
> >
> >
> > so, I have two questions:
> >
> > 1 - Why my virtual machines unsynchronize so quickly?
> > 2 - What am I doing wrong with ntpd?
> >
> > thanks in advance
> >
> > ESG
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