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@xxxxxxxxxx > [mailto:redhat-list-bounces@xxxxxxxxxx] 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 > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=subscribe > https://www.redhat.com/mailman/listinfo/redhat-list > ---------------------------------------------------------------- Mundipharma Vertriebsgesellschaft mbH & Co. KG Mundipharma Straße 6 65549 Limburg (Lahn) Tel: +49 (0)6431 701 0 Amtsgericht Limburg (Lahn) HRA 624 Persönlich haftende Gesellschafterin: Mundipharma Verwaltungsgesellschaft mbH, Sitz in Limburg (Lahn), Registergericht Limburg (Lahn) HRB 462 Geschäftsführer: Mortimer D. Sackler M.D., Raymond R. Sackler M.D., Richard S. Sackler M.D., Kathe A. Sackler M.D., Jonathan D. Sackler M.D., Mortimer David A. Sackler, Samantha S. Sackler-Hunt, Peter Boer, Åke Wikström, Gunther Niederheide, Jürgen Feld (stellvertretend) ---------------------------------------------------------------- -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
