On Mon, May 28, 2012 at 5:41 AM, James B. Byrne <byrnejb@xxxxxxxxxxxxx> wrote:
> We encountered a problem with respect to KVM virtual host restore and
> NTP. Specifically, our VM test host was shutdown by an extended power
> outage and when power returned all of the restored guests were
> immediately shutdown by ntp because the time differential between the
> restored systems and that of the ntpd sync servers exceeded the panic
> threshold.
>
> This is not an acceptable situation so in the absence of something
> more elegant we are contemplating shutting down ntpd on virtual hosts
> and scheduling regular ntpd -q from cron instead.
>
> Is there an alternative to this? If not then what would be a
> recommended scheduling interval?
The issue has been reported here:
http://bugs.centos.org/view.php?id=5726
You might want to try the workaround in note 15092, that is, to add
'tinker panic 0'
to the *top* of the /etc/ntp.conf file.
Akemi
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