[CentOS] Updating hardware clock from cron

Lamar Owen lowen at pari.edu
Fri Mar 4 21:17:03 UTC 2011

On Friday, March 04, 2011 04:05:43 pm m.roth at 5-cent.us wrote:
> Excuse me? The last time I was following this closely, and I think the
> last time I looked, about a year ago, they said the opposite, that the
> guest, if running Linux, should use ntp.
> Right:
> NTP Recommendations
> Note: In all cases use NTP instead of VMware Tools periodic time
> synchronization. Also, you may need to open the firewall (UDP 123) to
> allow NTP traffic.
> at

Argh, they've changed it..... Last I read that page the recommendation was opposite to that.  Although I remember the clock=pit part of that, and the divider=10 piece....

But I remember a couple of years ago reading the opposite about NTP....

Oh well, just goes to show that best practices change, although I have had fairly good results from VMware with the VMware tools sync, where I did not at that time have good results with NTP in the guest.  On ESX 3.0.x and later ESX 3.5.

Well, time to go redo some things, I guess.  We have a GPS-disciplined physical box as one of the three NTP masters we use....

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