Add kube_override_hostname to kubeadm certs. (#4903)

roles/kubernetes/master/tasks/kubeadm-setup.yml

@@ -55,7 +55,7 @@
 
 - name: kubeadm | aggregate all SANs
   set_fact:
-    apiserver_sans: "{{ (sans_base + groups['kube-master'] + sans_lb + sans_lb_ip + sans_supp + sans_access_ip + sans_ip + sans_address) | unique }}"
+    apiserver_sans: "{{ (sans_base + groups['kube-master'] + sans_lb + sans_lb_ip + sans_supp + sans_access_ip + sans_ip + sans_address + sans_override) | unique }}"
   vars:
     sans_base:
       - "kubernetes"
@@ -71,6 +71,7 @@
     sans_access_ip: "{{ groups['kube-master'] | map('extract', hostvars, 'access_ip') | list | select('defined') | list }}"
     sans_ip: "{{ groups['kube-master'] | map('extract', hostvars, 'ip') | list | select('defined') | list }}"
     sans_address: "{{ groups['kube-master'] | map('extract', hostvars, ['ansible_default_ipv4', 'address']) | list | select('defined') | list }}"
+    sans_override: "{{ [kube_override_hostname] if kube_override_hostname is defined else [] }}"
   tags: facts
 
 - name: Create audit-policy directory

roles/kubernetes/master/templates/kubeadm-controlplane.v1beta1.yaml.j2

@@ -16,7 +16,7 @@ controlPlane:
     advertiseAddress: {{ kube_apiserver_address }}
     bindPort: {{ kube_apiserver_port }}
 nodeRegistration:
-  name: {{ inventory_hostname  }}
+  name: {{ kube_override_hostname|default(inventory_hostname) }}
 {% if container_manager == 'crio' %}
   criSocket: /var/run/crio/crio.sock
 {% else %}