All management components must be configured to use NTP for time synchronization.

NTP Server Configuration

  • Configure two time sources that are external to the SDDC. These sources can be physical radio or GPS time servers, or even NTP servers running on physical routers or servers.
  • Ensure that the external time servers are synchronized to different time sources to ensure desirable NTP dispersion.

DNS Configuration

Configure a DNS Canonical Name (CNAME) record that maps the two time sources to one DNS name.

Table 1. NTP Server FQDN and IP Configuration
NTP Server FQDN Mapped IP Address
ntp.sfo01.rainpole.local
  • 172.16.11.251
  • 172.16.11.252
0.ntp.sfo01.rainpole.local 172.16.11.251
1.ntp.sfo01.rainpole.local 172.16.11.252

Time Synchronization on the SDDC Nodes

  • Synchronize the time with the NTP servers on the following systems:
    • ESXi hosts
    • AD domain controllers
    • Virtual appliances of the management applications
  • Configure each system with the ntp.sfo01.rainpole.local NTP server alias

Time Synchronization on the Application Virtual Machines

  • Verify that the default configuration on the Windows VMs is active, that is, the Windows VMs are synchronized with the NTP servers. 
  • As a best practice, for time synchronization on virtual machines, enable NTP-based time synchronization instead of the VMware Tools periodic time synchronization because NTP is an industry standard and ensures accurate timekeeping in the guest operating system.