Re: [Xen-users] Xen 3.1 clock problems

[Jayson Vantuyl <jvantuyl@xxxxxxxxxxxxxx>]

I have this problem with PV domains as well.  I always get a "your clock sucks" answer, but I've never had a system this worked right on.

However, it is possible to change the time in a DomU.  You have to set a sysctl value.  From sysctl.conf on my systems:

# Allow NTP To Sync Xen Clock

xen.independent_wallclock = 1

I combine this with multicast NTP to make my Xen instances all sync to the Dom0s on my systems (which in turn sync to places more reliable).

On May 30, 2007, at 5:09 AM, Petersson, Mats wrote:

-----Original Message-----

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 

[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Tony Hoyle

Sent: 30 May 2007 12:53

To: xen-users@xxxxxxxxxxxxxxxxxxx

Subject: [Xen-users] Xen 3.1 clock problems

Hi

In the past I've always assumed that if you got the time in 

dom0 right, 

then all the domu domains would have the correct time... something is 

broken in Xen 3.1 because now the domu time can be quite 

unrelated - and 

of course it's not possible to reset it back as you can't change the 

time in a domu...

This is causing havoc with kerberos.. it'll work fine for ages then 

suddenly one or other of the machines will stop authenticating.

dom0:

goliath:/home/tmh# date -u

Wed May 30 11:46:45 UTC 2007

domu:

wolf359:/var/log/samba# date -u

Wed May 30 09:23:08 UTC 2007

Is this a HVM or PV domain? I believe in HVM, the clock isn't synced,

and you'll need to use a NTP server or similar to sync your time. 

--

Mats

I wonder if this is related to 'time is going backwards' that seem to 

scroll constantly up the console?  From reading around I'd got the 

impression that this error was normal.

Tony

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-- 

Jayson Vantuyl

Systems Architect

Engine Yard

jvantuyl@xxxxxxxxxxxxxx

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