BZ2030453: Add initial steps to add server certificate

Author: xenolinux

modules/customize-certificates-api-add-named.adoc

@@ -31,6 +31,20 @@ cluster in a degraded state.
 
 .Procedure
 
+. Login to the new API as the `kubeadmin` user.
++
+[source,terminal]
+----
+$ oc login -u kubeadmin -p <password> https://FQDN:6443
+----
+
+. Get the `kubeconfig` file.
++
+[source,terminal]
+----
+$ oc config view --flatten > kubeconfig-newapi
+----
+
 . Create a secret that contains the certificate chain and private key in the
 `openshift-config` namespace.
 +