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adding locals
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‎05-iac/00-terraform/03-usando-inputs-outputs/02-demo.md‎

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@@ -200,7 +200,7 @@ variable "sg_ingress_port" {
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}
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variable "sg_egress_cidr_blocks" {
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type = list(string)
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type map = list(string)
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description = "cidr blocks allow for egress"
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default = ["0.0.0.0/0"]
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}
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}
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# ....
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```
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### Paso 6. Actualizamos las instancias
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Creamos nuevas entradas en `variables.tf` para las instancias
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mapas entradas en `variables.tf` para las instancias
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```diff
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‎05-iac/00-terraform/03-usando-inputs-outputs/03-demo.md‎

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# Añadiendo Locals a la Configuración
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## Pre requisitos
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> Si has destruidfo el entorno recrealo
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```bash
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cd lab/lc_web_app/
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terraform plan -out d1.tfplan
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terraform apply "d1.tfplan"
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```
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## Pasos
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### Paso 1. Crear un nuevo fichero para Locals
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Crear `./lab/lc_web_app/locals.tf`.
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```tf
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locals {
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common_tags = {
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}
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}
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```
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### Paso 2. Añadiendo valores
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Queremos añadir 3 valores, `company`, `project` y `billing_code`. Vamos a sacar esta información de las `variables`
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Actualizamos `variables.tf`
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```tf
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# ....
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# COMMON
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variable "company" {
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type = string
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description = "Company name for resource tagging"
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default = "Lemoncode"
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}
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variable "project" {
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type = string
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description = "Project name for resource tagging"
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}
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variable "billing_code" {
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type = string
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description = "Billing code for resource tagging"
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}
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```
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Ahora podemos actualizar `locals.tf`
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```diff
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locals {
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common_tags = {
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+ company = var.company
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+ project = "${var.company}-${var.project}"
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+ billing_code = var.billing_code
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}
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}
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```
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### Paso 4. Actualizando nuestra configuración
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Ahora podemos actualizar nuestra configuración con las etiquetas.
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Actualizamos `main.tf`
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```diff
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# PROVIDERS
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provider "aws" {
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access_key = var.aws_access_key
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secret_key = var.aws_secret_key
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region = var.aws_region
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}
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# DATA
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data "aws_ssm_parameter" "ami" {
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name = "/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2"
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}
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# RESOURCES
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# NETWORKING #
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resource "aws_vpc" "vpc" {
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cidr_block = var.vpc_cidr_block
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enable_dns_hostnames = var.vpc_enable_dns_hostnames
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+ tags = local.common_tags
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}
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resource "aws_internet_gateway" "igw" {
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vpc_id = aws_vpc.vpc.id
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+ tags = local.common_tags
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}
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resource "aws_subnet" "subnet1" {
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cidr_block = var.subnet_cidr_block
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vpc_id = aws_vpc.vpc.id
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map_public_ip_on_launch = var.subnet_map_public_ip_on_launch
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+ tags = local.common_tags
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}
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# ROUTING #
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resource "aws_route_table" "rtb" {
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vpc_id = aws_vpc.vpc.id
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route {
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cidr_block = var.route_table_cidr_block
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gateway_id = aws_internet_gateway.igw.id
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}
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+ tags = local.common_tags
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}
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resource "aws_route_table_association" "rta-subnet1" {
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subnet_id = aws_subnet.subnet1.id
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route_table_id = aws_route_table.rtb.id
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}
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# SECURITY GROUPS #
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resource "aws_security_group" "nginx-sg" {
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name = "nginx_sg"
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vpc_id = aws_vpc.vpc.id
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# HTTP access from anywhere
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ingress {
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from_port = var.sg_ingress_port
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to_port = var.sg_ingress_port
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protocol = "tcp"
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cidr_blocks = var.sg_ingress_cidr_blocks
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}
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# outbound internet access
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egress {
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from_port = var.sg_egress_port
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to_port = var.sg_egress_port
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protocol = "-1"
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cidr_blocks = var.sg_egress_cidr_blocks
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}
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+ tags = local.common_tags
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}
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# INSTANCES #
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resource "aws_instance" "nginx1" {
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ami = nonsensitive(data.aws_ssm_parameter.ami.value)
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instance_type = var.aws_instance_type
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subnet_id = aws_subnet.subnet1.id
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vpc_security_group_ids = [aws_security_group.nginx-sg.id]
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user_data = <<EOF
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#! /bin/bash
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sudo amazon-linux-extras install -y nginx1
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sudo service nginx start
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sudo rm /usr/share/nginx/html/index.html
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echo '<html><head><title>Lemon Land Server</title></head><body style=\"background-color:#1F778D\"><p style=\"text-align: center;\"><span style=\"color:#FFFFFF;\"><span style=\"font-size:28px;\">Welcome to &#127819; land</span></span></p></body></html>' | sudo tee /usr/share/nginx/html/index.html
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EOF
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+ tags = local.common_tags
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}
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```
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El `map` de locals `common_tags` será evaluado contra la etiqueta `tags`, la cual espera un tipo de dato `map`.
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## Clean Up
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```bash
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terraform destroy
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```

‎05-iac/00-terraform/03-usando-inputs-outputs/readme.md‎

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## Locals
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> Valores evaluados dentro de la configuración
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> Valores evaluados dentro de la configuración, no puedes modificar su valor, como las variables.
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Puedes tener múltiples entradas `locals`, pero sus pares `key/value` han de ser únicos.
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[Añadiendo Locals a la configuración - Demo 03](03-demo.md)

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