Updating your domain's name servers
After you create a managed zone, you can change the name servers that are associated with your domain registration to point to the Google Cloud DNS name servers. The process will differ by domain registrar provider and you should consult the documentation for your provider to determine how to make the name server change.
Look up your Cloud DNS name servers
You will need to determine the name servers that have been associated with your managed zone. Different managed zones will have different name servers. You can determine your name servers by running the following command:
gcloud dns managed-zone get YOURZONENAME
This command returns the list of name servers that are configured to serve DNS queries for your zone.
Change your domain registrar's name servers for your domain
Now that you have the list of name servers hosting your managed zone, you should update the NS records for your domain with your registrar. You will typically provide at least two name servers. To benefit from Cloud DNS' high availability, you must use all name servers.
After changing your domain registrar's name servers, it can take a while for resolver traffic to be directed to your new Cloud DNS name servers. Resolvers could continue to use your old name servers until the TTL on the old NS records expire.