Terraform example for OpenStack and Ansible

This example shows how to automate:

Creation of two instances sequentially with Terraform on OpenStack cluster.
Provisioning new instance via Ansible

Terraform does not have Ansible provisioner so we'll use local-exec provisioner for Ansible.

Create file /root/myservers.tf

# Configure the OpenStack Provider
provider "openstack" {
    tenant_name = "MyProject"
    user_name  = "admin"
    password  = "AdminPassword"
    auth_url  = "http://controller:5000/v2.0"
}

# Create a server-A
resource "openstack_compute_instance_v2" "server-A" {
  region = "MyRegion"
  name = "server-A"
  image_id = "fce7b6f8-d395-4f93-9aac-1db55e14d766"
  flavor_id = "d0d03e8e-4bd0-4afa-9fb1-fdf370d42375"
  key_pair = "MyRSA"
  security_groups = ["default"]

  network {
    name = "MyProvider"
  }

  provisioner "local-exec" {
    command = "sleep 30 && echo -e \"[server]\n${openstack_compute_instance_v2.server-A.network.0.fixed_ip_v4} ansible_ssh_private_key_file=/root/MyRSA.pem\" > inventory-terra &&  ansible-playbook -i inventory-terra /root/ansible/server.yml"
  }
}

# Create a server-B
resource "openstack_compute_instance_v2" "server-B" {
  depends_on = ["openstack_compute_instance_v2.server-A"]
  region = "MyRegion"
  name = "server-B"
  image_id = "fce7b6f8-d395-4f93-9aac-1db55e14d766"
  flavor_id = "d0d03e8e-4bd0-4afa-9fb1-fdf370d42375"
  key_pair = "MyRSA"
  security_groups = ["default"]

  network {
    name = "MyProvider"
  }

  provisioner "local-exec" {
    command = "sleep 30 && echo -e \"[server]\n${openstack_compute_instance_v2.server-B.network.0.fixed_ip_v4} ansible_ssh_private_key_file=/root/MyRSA.pem\" > inventory-terra &&  ansible-playbook -i inventory-terra /opt/it/ansible/server.yml"
  }
}

Ready to use:

terraform plan
terraform apply