"Unexpected error: I/0 error on GET.request - Temporary failure in name resolution" error during upgrade pre-check in VCF 9.1

Products

• VCF Operations

Issue/Introduction

During an upgrade pre-check, the DNS resolution of the Fleet FQDN will fail.

Within Ops Lifecycle, the following error is presented in the UI for the task:

Failed Stages: download_bundle_file, stage_bundle_file; ops.task.stage.failed

The sddc-upgrade-service will report an error similar to the following: 

Unexpected error: I/0 error on GET.request for \"https://<FLEET-FQDN>/depot-service/content-gateway/PROD/COMP/VROPS/VMware_Cloud_Foundation_Operations-9.1.1.0.25679887-upgrade-manifest. json\": <FLEET-FQDN> : Temporary failure in name resolution"

Environment

VCF 9.1

Resolution

Identify the primary Ops node:

1. Log in to the Aria/VCF Operations Admin UI as the local admin user using the URL: https://<IP_or_FQDN>/admin.
2. Navigate to the Cluster Management or System Status section.
3. Review each node in the cluster and review its assigned role (e.g., Primary, Replica, or Data).

To enable SSH on the node:

1. Log in to the Aria/VCF Operations Admin UI as the local admin user using the URL: https://<IP_or_FQDN>/admin. 
2. Navigate to the node list.
3. In the SSH Status column, toggle the switch to the Enabled position for the desired node.

Edit the "/etc/hosts' file using vi add an additional entry for the Fleet FQDN. 

Re-attempt the upgrade precheck.