modulos

• Forma de encapsular y reutilizar bloques de configuración.
• Sirve para modularizar infraestructura.
• Se publican o se pueden crear propios.

Primer modulo en terraform

Crear carpeta con la siguiente estructura:

nginx_server_module
├── 00.variables.tf
├── 01.provider.tf
├── 02.gce.tf
├── 03-firewall.tf
└── 99-outputs.tf

• Crear main.tf

##### modulos #####
module "nginx_server_dev" {
  source = "./nginx_server_module"

  image_id      = "ubuntu-minimal-2210-kinetic-amd64-v20230126"
  instance_type = "e2-micro"
  server_name   = "nginx-server"
  environment   = "dev"
}

terraform init

• Output

  Initializing the backend...
  Initializing modules...
  - nginx_server_dev in nginx_server_module
  Initializing provider plugins...
  - Reusing previous version of hashicorp/google from the dependency lock file
  - Using previously-installed hashicorp/google v6.40.0
  
  Terraform has been successfully initialized!
  
  You may now begin working with Terraform. Try running "terraform plan" to see
  any changes that are required for your infrastructure. All Terraform commands
  should now work.
  
  If you ever set or change modules or backend configuration for Terraform,
  rerun this command to reinitialize your working directory. If you forget, other
  commands will detect it and remind you to do so if necessary.
• Correr terraform plan
• Correr terraform apply
• Los outputs no se muestran porque se guardan por default en modules.
  • Debo agregar el ouput en el main.tf (No borrar el archivo tf del modulo)

  ##### modulos #####
  module "nginx_server_dev" {
    source = "./nginx_server_module"
  
    image_id      = "ubuntu-minimal-2210-kinetic-amd64-v20230126"
    instance_type = "e2-micro"
    server_name   = "nginx-server-dev"
    environment   = "dev"
  }
  
  output "public_ip" {
    description = "Dirección IP pública de la instancia GCP"
    value       = module.nginx_server_dev.public_ip
  }
• terraform plan Para ver el output.

Creamos modulo QA

• Crear clave ssh

  ssh-keygen -t rsa -b 2048 -f "ngnix-server-qa.key"
• Agregar el modulo QA

  ##### modulos #####
  module "nginx_server_dev" {
    source = "./nginx_server_module"
  
    image_id      = "ubuntu-minimal-2210-kinetic-amd64-v20230126"
    instance_type = "e2-micro"
    server_name   = "nginx-server-dev"
    environment   = "dev"
  }
  
  module "nginx_server_qa" {
    source = "./nginx_server_module"
  
    image_id      = "ubuntu-minimal-2210-kinetic-amd64-v20230126"
    instance_type = "e2-micro"
    server_name   = "nginx-server-qa"
    environment   = "qa"
  }
  
  output "dev_public_ip" {
    description = "Dirección IP pública de la instancia GCP DEV"
    value       = module.nginx_server_dev.dev_public_ip
  }
  
  output "qa_public_ip" {
    description = "Dirección IP pública de la instancia GCP QA"
    value       = module.nginx_server_dev.qa_public_ip
  }
• terraform init
• Algo extra, para guardar el output de un terraform plan para usarlo nuevo

   terraform plan -out server_qa.tfplan
• Esto crea un archivo para server_qa.tfplan
• Ahora implementar apply con ese archivo

  terraform apply server_qa.tfplan