Too bad the change is so small, it was deemed unnecessary to call out in the VMware vCenter Server 7.0 Update 1 Release Notes… Further reading VMware vSphere 7.0 Update 1 makes managing time synchronization in Active Directory environments a lot easier! This is a small yet welcome change to those managing complex environment, that will carry forward into the next versions of VMware vSphere. For Domain Controllers and domain-joined devices who experience a highly reliable time synchronization and correction mechanism, both options should be unchecked. With these options, there is no need anymore to get messy with the eight advanced configuration options for a virtual machine. Unchecking the Synchronize at startup and resume (recommended) option effectively instructs VMware Tools to assume that the administrator has consciously applied advanced time synchronization configuration. This box is checked by default to reflect the default VMware Tools behavior. The default behavior of adjusting a virtual machine’s clock through the VMware Tools during various virtual machine operations is now exposed in the virtual machine’s Properties as a checkbox.
With the above configuration, the virtual machine wouldn’t even synchronize its clock to the ESXi host’s clock when it is resumed, vMotion’ed, rebooted, when it is snapshotted or when its VMware Tools service is restarted or its disk is shrunk. To make this configuration change, a vSphere admin would add the following lines to the virtual Domain Controller’s advanced configuration options: Now it’s time for an update both for vSphere and for time synchronization.Ībout advanced time synchronization configurationĪdvanced time synchronization configuration is a method to effectively disable time synchronization for virtual machines on top of VMware ESXi hosts. This blogpost introduced the concept of advanced time synchronization configuration. This blogpost details how to configure time settings for Domain Controllers running as virtual machines on top of VMware vSphere. Back in July 2019, I wrote a blogpost on managing Active Directory Time Synchronization on VMware vSphere.
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