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Terraform Ansible Integration: GCP Example & Multiple VMs

YouTube Tutorial

Prerequisites

• Ansible
• Terraform

Generate SSH Key Pair

• Run the following command to generate elliptic curve ssh key pair

ssh-keygen -t ed25519 -f ~/.ssh/ansbile_ed25519 -C ansible

• Optionally, you can generate RSA key pair

ssh-keygen -t rsa -f ~/.ssh/ansbile -C ansible -b 2048

Add SSH Key to GCP Project

• Go to compute engine section
• Click Metadata
• Select SSH KEYS tab and click ADD SSH KEY
• Upload public ansbile_ed25519.pub key
  • cat ~/.ssh/ansbile_ed25519.pub

Create Ansible Playbook for Nginx Installation

• Create roles/nginx/tasks/main.yaml task
• Create nginx.yaml playbook
• Create Ansible config ansible.cfg to skip host key verification

Create Terraform Ansible Integration Example

• Create terraform file 1-example.tf
• Open default firewall rules
• Verify that you have Terraform and Ansible installed

command -v terraform
command -v ansible-playbook

• Run terraform init to download provider and plugins
• Run terraform apply to create Nginx instance in GCP

Provision Multiple VMs

• Destroy previous example terraform destroy
• Copy 1-example.tf -> 2-example.tf
• Rename 1-example.tf -> 1-example.tf.bac
• Add local variable

  web_servers = {
    nginx-000-staging = {
      machine_type = "e2-micro"
      zone         = "us-central1-a"
    }
    nginx-001-staging = {
      machine_type = "e2-micro"
      zone         = "us-central1-b"
    }
  }

  for_each = local.web_servers

  name         = each.key
  machine_type = each.value.machine_type
  zone         = each.value.zone

host = self.network_interface.0.access_config.0.nat_ip

command = "ansible-playbook  -i ${self.network_interface.0.access_config.0.nat_ip}, --private-key ${local.private_key_path} nginx.yaml"

output "nginx_ips" {
  value = {
    for k, v in google_compute_instance.nginx : k => "http://${v.network_interface.0.access_config.0.nat_ip}"
  }
}

• Run terraform apply

Clean Up

• terraform destroy
• rm ~/.ssh/ansbile*
• Delete SSH public key from GCP project