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resource "aws_instance" "etcd" {
    count = 3
    ami = "ami-1967056a" // Unbuntu 16.04 LTS HVM, EBS-SSD
    instance_type = "t2.micro"

    subnet_id = "${aws_subnet.kubernetes.id}"
    private_ip = "${cidrhost("10.43.0.0/16", 10 + count.index)}"
    associate_public_ip_address = true

    availability_zone = "eu-west-1a"

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- hosts: etcd
  roles:
    - common
    - etcd

- hosts: controller
  roles:
    - common
    - controller

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- hosts: all
  gather_facts: false
  tasks:
    - name: Install Python
      raw: "apt-get -y -q install python"
      become: true

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# Expects `kubernetes_api_endpoint` as `--extra-vars "kubernetes_api_endpoint=xxxx"`
- hosts: 127.0.0.1
  connection: local

  tasks:
  - name: Set kubectl endpoint
    shell: "kubectl config set-cluster {{ cluster_name }} --certificate-authority={{ playbook_dir }}/../cert/ca.pem --embed-certs=true --server=https://{{ kubernetes_api_endpoint }}:6443"

  - name: Set kubectl credentials
    shell: "kubectl config set-credentials {{ user }} --token {{ token }}"

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- name: Create etcd config dir
  file: path=/etc/etcd state=directory
  become: true
  
- name: Copy certificates
  copy:
    src: "{{ playbook_dir }}/../cert/{{ item }}"
    dest: "/etc/etcd/"
  become: true
  with_items:

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[defaults]
...
inventory = ./hosts/
...

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[tag_ansibleNodeType_etcd]
[tag_ansibleNodeType_worker]
[tag_ansibleNodeType_controller]

[etcd:children]
tag_ansibleNodeType_etcd

[worker:children]
tag_ansibleNodeType_worker

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[ec2]
instance_filters = tag:ansibleFilter=Kubernetes01
regions = eu-west-1
destination_variable = ip_address
vpc_destination_variable = ip_address
hostname_variable = tag_ansibleNodeName

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resource "aws_elb" "kubernetes_api" {
    name = "kube-api"
    instances = ["${aws_instance.controller.*.id}"]
    subnets = ["${aws_subnet.kubernetes.id}"]
    cross_zone_load_balancing = false

    security_groups = ["${aws_security_group.kubernetes_api.id}"]

    listener {
      lb_port = 6443

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resource "aws_instance" "worker" {
    count = 3
    ...
    tags {
      Owner = "Lorenzo"
      Name = "worker-${count.index}"
      ansibleFilter = "Kubernetes01"
      ansibleNodeType = "worker"
      ansibleNodeName = "worker${count.index}"
    }