[CentOS] Updating hardware clock from cron

On Friday, March 04, 2011 03:54:21 pm John R Pierce wrote:
> just setup NTP and forget about it, and it will always work right, 
> unless your system is really badly broken, whereupon, it would be better 
> to fix it than to continue to hack around like this.

For the sake of the archives, VMware guests should be set to sync from the host using the VMware tools functionality, and then the host should run NTP, even and especially on ESX.  VMware timekeeping in the guest can be made worse by running NTP inside the guest.  This is a well-known VMware issue, and is covered in depth on the VMware knowledgebase.