put Network Load Balancer in front of fluentd cluster

Author: afeld

terraform/mgmt/logging.tf

@@ -1,3 +1,8 @@
+locals {
+  logging_port = 514
+  logging_protocol = "TCP"
+}
+
 # temporary, until we have an image for this
 data "aws_ami" "ubuntu" {
   most_recent = true
@@ -35,9 +40,37 @@ resource "aws_autoscaling_group" "log_forwarding" {
   min_size                  = 1
   desired_capacity          = 2
 
+  target_group_arns = ["${aws_alb_target_group.log_forwarding.arn}"]
+
   tag {
     key                 = "Component"
     value               = "log-forwarding"
     propagate_at_launch = true
   }
 }
+
+resource "aws_alb" "log_forwarding" {
+  # TODO make internal?
+  # internal = true
+  # https://aws.amazon.com/elasticloadbalancing/details/#compare
+  load_balancer_type = "network"
+  # TODO change to private
+  subnets = ["${module.network.public_subnets}"]
+}
+
+resource "aws_alb_target_group" "log_forwarding" {
+  vpc_id = "${module.network.vpc_id}"
+  port = "${local.logging_port}"
+  protocol = "${local.logging_protocol}"
+}
+
+resource "aws_alb_listener" "log_forwarding" {
+  load_balancer_arn = "${aws_alb.log_forwarding.arn}"
+  port = "${local.logging_port}"
+  protocol = "${local.logging_protocol}"
+
+  default_action {
+    target_group_arn = "${aws_alb_target_group.log_forwarding.arn}"
+    type = "forward"
+  }
+}