Hi Peter,
I found various posts on this but it is still not 100% clear to me.
I have two servers (with XCP 1.6) each running a handfull of Debian guests.
What is the best method to have the same time on all Debian guests? (On
both servers there is a PostgreSQL database running in a master <->
master replication configuration so I am interested in having everywhere
the same time).
I see the following solutions:
1) Each Debian guest has its own ntp client.
2) XCP uses ntp to sync its own time and all guests then sync themselves
with XCP.
3) ???
you can get available clocksource on your current xen kernel looking at
the following /sys pseudo-file (I think in that clocksource is on a
stock debian xen kernel, you may get something different if you install
the xcp kernel).
cat /sys/devices/system/clocksource/clocksource0/available_clocksource
And you can get the current clocksource looking at
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
To my knowledge there is a magical clock source that is supposed to sync
the dom0 and domU time in community XCP, but I was more succesfull at
having independant clock and using ntp in all the domU.
You may find some more information on this page
http://wiki.debian.org/Xen/Clocksource
Btw, does the installation of the "xs-tools" help in syncing times?
I don't think so, I always have to install ntp client in my domUs.
Actually my nagios complains when time drift above 1 seconds, and I have
600+ XCP VMs that are in the green, so I guess this method works fine :-)
Cheers,
Denis
Thanks & cheers,
Peter
This body part will be downloaded on demand.
--
Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0) 2.40.97.57.55
http://www.tranquil-it-systems.fr
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