typhoon/aws/fedora-atomic/kubernetes/controllers.tf

# Discrete DNS records for each controller's private IPv4 for etcd usage
resource "aws_route53_record" "etcds" {
  count = "${var.controller_count}"

  # DNS Zone where record should be created
  zone_id = "${var.dns_zone_id}"

  name = "${format("%s-etcd%d.%s.", var.cluster_name, count.index, var.dns_zone)}"
  type = "A"
  ttl  = 300

  # private IPv4 address for etcd
  records = ["${element(aws_instance.controllers.*.private_ip, count.index)}"]
}

# Controller instances
resource "aws_instance" "controllers" {
  count = "${var.controller_count}"

  tags = {
    Name = "${var.cluster_name}-controller-${count.index}"
  }

  instance_type = "${var.controller_type}"

  ami       = "${data.aws_ami.fedora.image_id}"
  user_data = "${element(data.template_file.controller-cloudinit.*.rendered, count.index)}"

  # storage
  root_block_device {
    volume_type = "${var.disk_type}"
    volume_size = "${var.disk_size}"
  }

  # network
  associate_public_ip_address = true
  subnet_id                   = "${element(aws_subnet.public.*.id, count.index)}"
  vpc_security_group_ids      = ["${aws_security_group.controller.id}"]

  lifecycle {
    ignore_changes = ["ami"]
  }
}

# Controller Cloud-Init
data "template_file" "controller-cloudinit" {
  count = "${var.controller_count}"

  template = "${file("${path.module}/cloudinit/controller.yaml.tmpl")}"

  vars = {
    # Cannot use cyclic dependencies on controllers or their DNS records
    etcd_name   = "etcd${count.index}"
    etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"

    # etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
    etcd_initial_cluster = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"

    kubeconfig            = "${indent(6, module.bootkube.kubeconfig)}"
    ssh_authorized_key    = "${var.ssh_authorized_key}"
    k8s_dns_service_ip    = "${cidrhost(var.service_cidr, 10)}"
    cluster_domain_suffix = "${var.cluster_domain_suffix}"
  }
}

# Horrible hack to generate a Terraform list of a desired length without dependencies.
# Ideal ${repeat("etcd", 3) -> ["etcd", "etcd", "etcd"]}
resource null_resource "repeat" {
  count = "${var.controller_count}"

  triggers {
    name   = "etcd${count.index}"
    domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
  }
}