Upgrade Assessment result shows Warning: NTP Servers are not reachable

Products

• VMware Aria Suite

Issue/Introduction

• After running the Pre-Upgrade Readiness Assessment Tool for VMware Aria Operations 8.18.x, you have a Warning that specifies the alert: NTP Servers are not reachable
• You have also checked KB: Alert Triggered: NTP Servers are not reachable and it doesn't apply
  • You checked the ntp.conf file noted in the above KB and the line with the NTP server is not commented out

Environment

Aria Operations 8.x

Cause

• NTP server configured with fully qualified domain name (FQDN) is not able to be resolved by the Cloud Proxy
• NTP server can be pinged by IP address from the Cloud Proxy but not by FQDN
• There may be an issue with DNS or other network configuration on the Cloud Proxy itself
• vApp Options on the Cloud Proxy are no longer enabled or set, which includes all networking properties

Resolution

• Use ping and nslookup commands from the Cloud Proxy to the NTP server's IP and  FQDN. If any command fails check that there is no issue on the network like DNS
• You might also check the vApp Options for the Cloud Proxy - See Restoring vApp properties in VMware Aria Operations 8.14 and Later

Additional Information

If all the vApp Options on the Cloud Proxy are missing and you do not want to restore manually, it might be easier to redeploy a new Cloud Proxy.

See Configuring Cloud Proxies in VMware Aria Operations

If you want to use the same hostname and IP address, be sure to power off the old Cloud Proxy before powering on the new one.

NOTE: If you power off the Cloud Proxy, any adapters that are running on it will not be able to collect data. If you have collector groups, the adapters should move over automatically to other Cloud Proxies in the group and resume collections.

See Configuring Collector Groups

In case you don't have collector groups created, once the new Cloud Proxy is deployed and showing in Aria Operations, manually move any adapters that were once associated to the Cloud Proxy that you are replacing. You can do this by editing the adapter instance under Integrations. You can then delete the old Cloud Proxy from Aria Operations if needed from the Cloud Proxies page.