DNS/NTP configuration/validation fails with error in logs:
"Failed to validate ntp sync using [<ntp server>] on <host name>"
or
"NTP sync command output is blank. Time synchronization of the NTP servers [<ntp server>] failed on the entity <host ip>".
By default NTP sync validation is enabled. Disable the NTP sync validation by following the below mentioned steps:
Login to SDDC Manager Virtual Machine using ‘VCF’ account. Switch to ‘root’ account.
Take backup of operations manager configuration file using the command (The location can be changed to some other place if needed):
cp /opt/vmware/vcf/operationsmanager/application-prod.properties /home/vcf/application-prod.properties.backup
(This path is changed in the 4.x version)
Append the following properties in operations manager configuration file (/opt/vmware/vcf/operationsmanager/application-prod.properties).
ntp.config.skip.validation=true
Restart operations manager service.
systemctl restart operationsmanager
Run NTP configuration validation again.