add autoscaling group for log forwarder

Author: afeld

terraform/mgmt/logging.tf

@@ -0,0 +1,43 @@
+# temporary, until we have an image for this
+data "aws_ami" "ubuntu" {
+  most_recent = true
+
+  filter {
+    name   = "name"
+    values = ["*ubuntu-xenial-16.04-amd64-server-*"]
+  }
+  filter {
+    name   = "virtualization-type"
+    values = ["hvm"]
+  }
+  filter {
+    name   = "root-device-type"
+    values = ["ebs"]
+  }
+
+  owners = ["099720109477"] # Canonical
+}
+
+resource "aws_launch_configuration" "log_forwarding" {
+  name          = "log-forwarding"
+  image_id      = "${data.aws_ami.ubuntu.id}"
+  instance_type = "t2.micro"
+}
+
+resource "aws_autoscaling_group" "log_forwarding" {
+  availability_zones = ["${data.aws_region.current.name}${var.az}"]
+  vpc_zone_identifier = ["${module.network.private_subnets}"]
+  # will likely switch to Launch Template once available
+  # https://github.com/terraform-providers/terraform-provider-aws/issues/2505
+  launch_configuration      = "${aws_launch_configuration.log_forwarding.name}"
+
+  max_size                  = 3
+  min_size                  = 1
+  desired_capacity          = 2
+
+  tag {
+    key                 = "Component"
+    value               = "log-forwarding"
+    propagate_at_launch = true
+  }
+}