Change master to advertise external IP in kubernetes service.

Change master to advertise external IP in kubernetes service.
In effect, in HA mode in case of multiple masters, IP of external load
balancer will be advertise in kubernetes service.

cluster/common.sh

@@ -701,6 +701,7 @@ MANIFEST_URL_HEADER: $(yaml-quote ${MANIFEST_URL_HEADER:-})
 NUM_NODES: $(yaml-quote ${NUM_NODES})
 STORAGE_BACKEND: $(yaml-quote ${STORAGE_BACKEND:-etcd2})
 ENABLE_GARBAGE_COLLECTOR: $(yaml-quote ${ENABLE_GARBAGE_COLLECTOR:-})
+MASTER_ADVERTISE_ADDRESS: $(yaml-quote ${MASTER_ADVERTISE_ADDRESS:-})
 EOF
     # ETCD_IMAGE (if set) allows to use a custom etcd image.
     if [ -n "${ETCD_IMAGE:-}" ]; then

cluster/gce/gci/configure-helper.sh

@@ -777,6 +777,8 @@ function start-kube-apiserver {
     params+=" --advertise-address=${vm_external_ip}"
     params+=" --ssh-user=${PROXY_SSH_USER}"
     params+=" --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile"
+  else [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]
+    params="${params} --advertise-address=${MASTER_ADVERTISE_ADDRESS}"
   fi
 
   local webhook_authn_config_mount=""

cluster/gce/trusty/configure-helper.sh

@@ -603,6 +603,8 @@ start_kube_apiserver() {
     params="${params} --advertise-address=${vm_external_ip}"
     params="${params} --ssh-user=${PROXY_SSH_USER}"
     params="${params} --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile"
+  else [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]
+    params="${params} --advertise-address=${MASTER_ADVERTISE_ADDRESS}"
   fi
   readonly kube_apiserver_docker_tag=$(cat /home/kubernetes/kube-docker-files/kube-apiserver.docker_tag)
 

cluster/gce/util.sh

@@ -782,6 +782,7 @@ function create-master() {
   fi
 
   KUBERNETES_MASTER_NAME="${MASTER_RESERVED_IP}"
+  MASTER_ADVERTISE_ADDRESS="${MASTER_RESERVED_IP}"
 
   create-certs "${MASTER_RESERVED_IP}"