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vsphere-prerequisites.md

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vSphere Platform Pre-Requisites

In order to successfully use the Windows Machine Config Operator (WMCO) on a vSphere Platform, the following pre-requisites are required:

Alternatively, a programmatic approach for the creation of the Windows VM golden image can be found here.

Adding a DNS entry in vSphere environment

WMCO downloads the ignition files from the internal API server endpoint. To enable this, add a new DNS entry for

api-int.<cluster-name>.domain.com

which points to the external API server URL

api.<cluster-name>.domain.com

where <cluster-name> is the name of the Openshift cluster.

Note: The DNS entry can be a CNAME or an additional A record.

The above DNS entry ensures that Windows VM can download the ignition file from the internal API server and the kubelet on the configured VM can communicate with the internal API server. In the case of Linux nodes, CoreDNS is running on every node which helps in resolving the internal API server URL. The external API endpoint should have been created as part of the cluster install.