Section Number and Name:
Describe the issue:
In 3.10 and + we do not allow the overwriting of openshift_hostname via the installer any longer, there are many many issues with hostnames not being correct when installing the cluster.
We need information on how to confirm what hostname and nodename will be used before an install when installing with cloud-provider or with out cloud-provider.
Basically we should outline that `hostname -f` will be used as the nodename and name on the server certs for the nodes and masters. We should state that this should be set to the FQDN.
# hostnamectl set-hostname <NODE_FQDN>
Then for cloud-provider enabled cluster we should state more clearly what hostname and nodenames will be used, and state that best practice is to make sure `hostname -f` also gets set to this to avoid confusion.
KCS with some details: