control_plane.tf

// hack to get around terraform not allowing variable interpolation 
// in aws tags block
locals {
  common_tags = {
    Name                                 = "control-plane"
    "kubernetes.io/cluster/${var.stage}" = "${var.stage}"
  }
}

resource "aws_instance" "control_plane" {
  ami = "${data.aws_ami.ubuntu.id}"

  instance_type = "t2.large"

  subnet_id = "${aws_subnet.public.0.id}"

  vpc_security_group_ids = ["${aws_security_group.ssh.id}",
    "${aws_security_group.icmp.id}",
    "${aws_security_group.egress.id}",
    "${aws_security_group.kube.id}",
    "${aws_security_group.allow_https.id}",
  ]

  source_dest_check = false

  iam_instance_profile = "${aws_iam_instance_profile.control_plane.name}"
  key_name             = "${aws_key_pair.kube.key_name}"

  lifecycle {
    create_before_destroy = true
  }

  root_block_device {
    volume_type           = "gp2"
    volume_size           = 20
    delete_on_termination = true
  }

  # tags {
  #   Name                         = "control-plane"
  #   "kubernetes.io/cluster/test" = "test"
  # }

  tags = "${merge(
    local.common_tags
  )}"
  associate_public_ip_address = true
  user_data                   = "${data.template_cloudinit_config.control_plane.rendered}"
  connection {
    user        = "ubuntu"
    private_key = "${file("/Users/jamesweber/.ssh/id_rsa")}"
  }

}

data "template_file" "control_plane" {
  template = "${file("${path.root}/control_plane.tpl")}"

  vars {
    k8s_token   = "${var.k8s_token}"
    elb_dnsname = "${var.route53_elb_cname}"
  }
}

data "template_cloudinit_config" "control_plane" {
  gzip          = false
  base64_encode = false

  part {
    content_type = "text/cloud-config"
    content      = "${data.template_file.control_plane.rendered}"
  }
}

output "control_plane.public_ip" {
  value = "${aws_instance.control_plane.public_ip}"
}