VMware VS4-ENT-PL-A Setup Guide - Page 60

vSphere Installation and Setup Synchronize the vCenter Server Appliance Clock with an NTP Server Before you deploy thevCenter Server Appliance, make sure all machines on the network have their clocks synchronized. Unsynchronized clocks can cause installation and authentication errors. On systems that are joined to a Windows domain, the vCenter Server Appliance clock is synchronized automatically with the domain controller. On other systems, you can enable synchronizing the clock through VMware Tools. As an alternative, you can use this procedure. Procedure 1 Open a Web browser and navigate to thevCenter Server Appliance Management Interface (https://vCenter-Appliance-Address:5480/). 2 Log in as root. 3 From the vCenter Server tab, select the Time subtab. 4 Select one or more of the available options. Option No synchronization NTP synchronization VMware Tools synchronization Active Directory synchronization Description Does not perform synchronization. Select this option and specify one or more NTP servers to configure the appliance to synchronize with an NTP server directly. Select this option to synchronize all virtual machines. This option becomes available only if you add the appliance to an Active Directory domain. If you select this option, none of the other options is available. 5 Click Save Settings. The vCenter Server Appliance clock is synchronized with the NTP server. Configure a Windows NTP Client for Network Clock Synchronization The clocks of all servers on the vSphere network must be synchronized. You can configure a Windows NTP client as a source for clock synchronization on Windows servers. Use the registry editor on the Windows server to make the configuration changes. Procedure 1 Enable NTP mode. a Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters b Set the Type value to NTP. 2 Enable the NTP client. a Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config b Set the AnnounceFlags value to 5. 60 VMware, Inc.