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Public DNS Zone

Azure's DNS Zone service is used by the OpenShift installer to configure cluster DNS resolution and provide name lookup for the cluster to the outside world. To use OpenShift, you must have created a public DNS zone in Azure in the same subscription as your OpenShift cluster. You must also ensure the zone is "authoritative" for the domain. There are two ways to do this outlined below: root domain and subdomain. A root domain is example.com. A subdomain is of the form clusters.example.com.

The below sections identify how to ensure your hosted zone is authoritative for a domain.

Step 1: Acquire/Identify Domain

You may skip this step if using an existing domain and registrar. You will move the authoritative DNS to Azure or submit a delegation request for a subdomain in a later step.

Azure can also purchase domains for you and act as a registrar. If you allow Azure to purchase a new domain for you, you can skip the remainder of these steps (the domain is created and the hosted zone is created correctly for you)!

Documentation on buying domain for Azure

Step 2: Create Public Hosted Zone

Whether using a root domain or a subdomain, you must create a public, hosted zone.

Azure: Creating a Public DNS Zone

To use the root domain, you'd create the hosted zone with the value example.com. To use a subdomain, you'd create a hosted zone with the value clusters.example.com. (Use appropriate domain values for your situation.)