use loadbalancer when that's possible

roles/network_plugin/templates/network-environment.j2

@@ -5,7 +5,11 @@ CALICO_IPAM=true
 DEFAULT_IPV4={{ip | default(ansible_default_ipv4.address) }}
 
 # The kubernetes master IP
+{% if loadbalancer_apiserver is defined and apiserver_loadbalancer_domain_name is defined %}
+KUBERNETES_MASTER=https://{{ apiserver_loadbalancer_domain_name }}:{{ loadbalancer_apiserver.port }}
+{% else %}
 KUBERNETES_MASTER={{ hostvars[groups['kube-master'][0]]['ip'] | default(hostvars[groups['kube-master'][0]]['ansible_default_ipv4']['address']) }}
+{% endif %}
 
 # Location of etcd cluster used by Calico.  By default, this uses the etcd
 # instance running on the Kubernetes Master