[Cialug] xen and ntp on centos

[Barry Von Ahsen]

dom0 is running ntpd, domU is doing nothing time-wise

-barry


On 8/4/2011 3:53 PM, David Champion wrote:
> I assume the time on dom0 is good?
>
> Is domU running ntpd or the silly ntp cron script that Redhat is so fond of?
> Maybe just un-install ntpd on domU?
>
> -dc
>
> On Thu, Aug 4, 2011 at 3:33 PM, Barry Von Ahsen<barry at vonahsen.com>  wrote:
>
>> yes, this again :)
>>
>> every document in the world says run ntpd on dom0, and domU will
>> automatically update, except it doesn't on centos.  in the last 24 hours
>> (when I manually fixed it), domU is nearly 40 minutes fast.
>>
>> several sources said to check /proc/sys/xen/independent_**wallclock on the
>> guest, but I don't have a /proc/sys/xen there, am I missing a package?
>>
>>
>> simul-date:
>> [barry at xen ~]# date
>> Thu Aug  4 15:25:45 CDT 2011
>> [barry at domU ~]$ date
>> Thu Aug  4 16:04:40 CDT 2011
>>
>>
>> dom0:
>> [barry at xen ~]$ cat /etc/issue
>> CentOS release 5.6 (Final)
>> Kernel \r on an \m
>>
>> [barry at xen ~]$ uname -a
>> Linux 2.6.18-238.19.1.el5xen #1 SMP Fri Jul 15 08:16:59 EDT 2011 x86_64
>> x86_64 x86_64 GNU/Linux
>>
>> [barry at xen ~]$ cat /proc/sys/xen/independent_**wallclock
>> 0
>>
>> [barry at xen ~]# grep ntpd /var/log/messages
>> (snip)
>> Aug  3 11:04:27 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
>> Aug  3 12:11:07 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2
>> Aug  4 03:50:07 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
>> Aug  4 07:44:59 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2
>> Aug  4 09:49:03 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
>> Aug  4 14:35:21 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2
>>
>> [barry at xen ~]# rpm -qa | grep xen
>> xen-libs-3.0.3-120.el5_6.3
>> kernel-xen-2.6.18-238.19.1.el5
>> kernel-xen-2.6.18-238.9.1.el5
>> xen-3.0.3-120.el5_6.3
>>
>>
>>
>> domU:
>> [barry at domU ~]$ cat /etc/issue
>> CentOS release 5.6 (Final)
>> Kernel \r on an \m
>>
>> [barry at domU ~]$ uname -a
>> Linux 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 x86_64
>> x86_64 GNU/Linux
>>
>> [barry at domU ~]$ cat /proc/sys/xen/independent_**wallclock
>> cat: /proc/sys/xen/independent_**wallclock: No such file or directory
>>
>> [barry at domU ~]$ rpm -qa | grep xen
>> (nothing)
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