Change kube-apiserver port from 443 to 6443

* Adjust firewall rules, security groups, cloud load balancers,
and generated kubeconfig's
* Facilitates some future simplifications and cost reductions
* Bare-Metal users who exposed kube-apiserver on a WAN via their
router or load balancer will need to adjust its configuration.
This is uncommon, most apiserver are on LAN and/or behind VPN
so no routing infrastructure is configured with the port number

aws/container-linux/kubernetes/apiserver.tf

@@ -28,7 +28,7 @@ resource "aws_lb" "apiserver" {
 resource "aws_lb_listener" "apiserver-https" {
   load_balancer_arn = "${aws_lb.apiserver.arn}"
   protocol          = "TCP"
-  port              = "443"
+  port              = "6443"
 
   default_action {
     type             = "forward"
@@ -43,12 +43,12 @@ resource "aws_lb_target_group" "controllers" {
   target_type = "instance"
 
   protocol = "TCP"
-  port     = 443
+  port     = 6443
 
   # TCP health check for apiserver
   health_check {
     protocol = "TCP"
-    port     = 443
+    port     = 6443
 
     # NLBs required to use same healthy and unhealthy thresholds
     healthy_threshold   = 3
@@ -65,5 +65,5 @@ resource "aws_lb_target_group_attachment" "controllers" {
 
   target_group_arn = "${aws_lb_target_group.controllers.arn}"
   target_id        = "${element(aws_instance.controllers.*.id, count.index)}"
-  port             = 443
+  port             = 6443
 }

aws/container-linux/kubernetes/bootkube.tf

@@ -1,6 +1,6 @@
 # Self-hosted Kubernetes assets (kubeconfig, manifests)
 module "bootkube" {
-  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=0e98e89e14a074768db13c4e050ed0c13319a0c1"
+  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=2bcf61b2b5f6268fcf99e6b803165b08fd0b73c0"
 
   cluster_name          = "${var.cluster_name}"
   api_servers           = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

aws/container-linux/kubernetes/security.tf

@@ -36,8 +36,8 @@ resource "aws_security_group_rule" "controller-apiserver" {
 
   type        = "ingress"
   protocol    = "tcp"
-  from_port   = 443
-  to_port     = 443
+  from_port   = 6443
+  to_port     = 6443
   cidr_blocks = ["0.0.0.0/0"]
 }