When I installed vCenter appliance in the lab, I didn’t use a NTP server. (I know… STOOPID !!!) So how can you configure it afterwards ?
Login to the vCenter Appliance.
timesync.get will give you what mode the appliance is in.
ntp.server.add –servers <NTP Server> will add a NTP server
timesync.set –mode NTP will set the mode the NTP instead of host mode
ntp.get will give you the status of the NTP mode.
