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funciones y looping added
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‎05-iac/00-terraform/06-usando-funciones-looping/19-demo.md‎

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# Actualizando la VPC y las instancias
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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 d4.tfplan
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terraform apply "d4.tfplan"
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```
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## Pasos
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### Paso 1.
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Creamos un nueva entrada en el fichero de variables, para controlar el número de instancias que queremos.
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Actualizamos `variables.tf`
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```diff
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# NETWORKING
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variable "vpc_cidr_block" {
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type = string
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description = "VPC cidr block"
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default = "10.0.0.0/16"
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}
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+
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+variable "vpc_subnet_count" {
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+ type = number
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+ description = "Number of subnets to create"
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+ default = 2
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+}
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+
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variable "vpc_enable_dns_hostnames" {
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type = bool
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description = "Enable / Disable DNS hostnames on VPC"
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default = true
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}
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```
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### Paso 2.
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Ahora podemos actualizar el recurso de las subnets.
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Actualizamos `network.tf`
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```diff
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+resource "aws_subnet" "subnets" {
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+ count = var.vpc_subnet_count
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+ cidr_block = var.subnets_cidr_block[count.index]
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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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+ availability_zone = data.aws_availability_zones.available.names[count.index]
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+}
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+
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- resource "aws_subnet" "subnet1" {
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- cidr_block = var.subnets_cidr_block[0]
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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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- availability_zone = data.aws_availability_zones.available.names[0]
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-
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- tags = local.common_tags
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- }
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-
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- resource "aws_subnet" "subnet2" {
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- cidr_block = var.subnets_cidr_block[1]
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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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- availability_zone = data.aws_availability_zones.available.names[1]
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-
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- tags = local.common_tags
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- }
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```
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En consecuencia debemos actualizar la asociación de rutas paras las subnets.
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```diff
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-resource "aws_route_table_association" "rta-subnet1" {
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+resource "aws_route_table_association" "rta-subnets" {
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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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```
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```diff
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resource "aws_route_table_association" "rta-subnets" {
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+ count = var.vpc_subnet_count
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- subnet_id = aws_subnet.subnet1.id
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+ subnet_id = aws_subnet.subnets[count.index].id
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route_table_id = aws_route_table.rtb.id
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}
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```
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Ahora podemos eliminar `rta-subnet2`
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```diff
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-resource "aws_route_table_association" "rta-subnet2" {
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- subnet_id = aws_subnet.subnet2.id
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- route_table_id = aws_route_table.rtb.id
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-}
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```
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### Paso 3.
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Ahora que hemos hecho esto vamos a actulizar las instancias.
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Actualizamos `variables.tf`
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```diff
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# INSTANCES
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variable "aws_instance_type" {
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type = string
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description = "The EC2 instance to be used"
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default = "t2.micro"
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}
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+
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+variable "instance_count" {
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+ type = number
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+ description = "Number of instances to create in VPC"
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+ default = 2
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+}
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+
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```
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Actualizamos `instances.tf`
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```diff
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# INSTANCES #
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-resource "aws_instance" "nginx1" {
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+resource "aws_instance" "nginx" {
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+ count = var.instance_count
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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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+ subnet_id = aws_subnet.subnets[count.index].id
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vpc_security_group_ids = [aws_security_group.nginx-sg.id]
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iam_instance_profile = aws_iam_instance_profile.nginx_profile.name
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depends_on = [aws_iam_role_policy.allow_s3_all]
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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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aws s3 cp s3://${aws_s3_bucket.web_bucket.id}/website/index.html /home/ec2-user/index.html
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aws s3 cp s3://${aws_s3_bucket.web_bucket.id}/website/fruits.png /home/ec2-user/fruits.png
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sudo rm /usr/share/nginx/html/index.html
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sudo cp /home/ec2-user/index.html /usr/share/nginx/html/index.html
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sudo cp /home/ec2-user/fruits.png /usr/share/nginx/html/fruits.png
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EOF
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tags = local.common_tags
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}
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-resource "aws_instance" "nginx2" {
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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.subnet2.id
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- vpc_security_group_ids = [aws_security_group.nginx-sg.id]
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- iam_instance_profile = aws_iam_instance_profile.nginx_profile.name
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- depends_on = [aws_iam_role_policy.allow_s3_all]
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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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- aws s3 cp s3://${aws_s3_bucket.web_bucket.id}/website/index.html /home/ec2-user/index.html
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- aws s3 cp s3://${aws_s3_bucket.web_bucket.id}/website/fruits.png /home/ec2-user/fruits.png
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- sudo rm /usr/share/nginx/html/index.html
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- sudo cp /home/ec2-user/index.html /usr/share/nginx/html/index.html
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- sudo cp /home/ec2-user/fruits.png /usr/share/nginx/html/fruits.png
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- EOF
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-
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- tags = local.common_tags
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-
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- }
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-
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```
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### Paso 4.
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Por último actualizamos `loadbalancer.tf`
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```diff
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-resource "aws_lb_target_group_attachment" "nginx1" {
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+resource "aws_lb_target_group_attachment" "nginx" {
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+ count = var.instance_count
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target_group_arn = aws_lb_target_group.nginx.arn
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- target_id = aws_instance.nginx1.id
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+ target_id = aws_instance.nginx[count.index].id
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port = 80
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}
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-
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-resource "aws_lb_target_group_attachment" "nginx2" {
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- target_group_arn = aws_lb_target_group.nginx.arn
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- target_id = aws_instance.nginx2.id
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- port = 80
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-}
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```
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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/06-usando-funciones-looping/20-demo.md‎

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# Actualizando S3 Bucket Objects
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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 d4.tfplan
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terraform apply "d4.tfplan"
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```
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## Pasos
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Actualizamos `s3.tf`
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```diff
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## aws_s3_bucket_object
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+resource "aws_s3_bucket_object" "website_content" {
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+ for_each = {
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+ website = "/website/index.html"
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+ logo = "/website/fruits.png"
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+ }
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+ bucket = aws_s3_bucket.web_bucket.bucket
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+ key = each.value
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+ source = ".${each.value}"
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+
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+ tags = local.common_tags
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+}
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- resource "aws_s3_bucket_object" "website" {
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- bucket = aws_s3_bucket.web_bucket.bucket
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- key = "/website/index.html"
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- source = "./website/index.html"
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-
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- tags = local.common_tags
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- }
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-
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- resource "aws_s3_bucket_object" "graphic" {
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- bucket = aws_s3_bucket.web_bucket.bucket
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- key = "/website/fruits.png"
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- source = "./website/fruits.png"
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-
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- tags = local.common_tags
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- }
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```
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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/06-usando-funciones-looping/21-demo.md‎

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# Testeando las Funciones con la Consola de Terraform
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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 d4.tfplan
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terraform apply "d4.tfplan"
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```
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## Pasos
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### Paso 1. Console setup
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Necesitamos inicializar la configuración para que la consola de Terraform funcione. En nuestro caso ya esta inicializada así que no deberíamos tener que preocuparnos por esto.
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```bash
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terraform init
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```
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```bash
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Initializing the backend...
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Initializing provider plugins...
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- Reusing previous version of hashicorp/random from the dependency lock file
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- Reusing previous version of hashicorp/aws from the dependency lock file
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- Using previously-installed hashicorp/random v3.1.0
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- Using previously-installed hashicorp/aws v3.70.0
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Terraform has been successfully initialized!
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You may now begin working with Terraform. Try running "terraform plan" to see
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any changes that are required for your infrastructure. All Terraform commands
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should now work.
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If you ever set or change modules or backend configuration for Terraform,
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rerun this command to reinitialize your working directory. If you forget, other
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commands will detect it and remind you to do so if necessary.
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```
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### Paso 2. Arrancar la consola.
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```bash
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terraform console
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```
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Ahora podemos probar diferentes funciones
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```bash
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min(89, 90, 4)
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lower("TOMATO")
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```
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Vamos a testear `cidrsubnet` alimentando el valor `vpc_cidr_block`. Podemos comprobar su valor por defecto de la siguiente forma:
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[cidrsunet docs](https://www.terraform.io/language/functions/cidrsubnet)
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```
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> var.vpc_cidr_block
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"10.0.0.0/16
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```
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Y la podemos usar de la siguiente manera
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```
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> cidrsubnet(var.vpc_cidr_block, 8, 0)
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"10.0.0.0/24"
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> cidrsubnet(var.vpc_cidr_block, 8, 4)
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"10.0.4.0/24"
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```
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Otra funcion interesante es `lookup`, que nos ayuda a encontrar un valor en un `map`
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```
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> lookup(local.common_tags, "company", "Unknown")
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"Lemoncode"
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> lookup(local.common_tags, "missing", "Unknown")
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"Unknown"
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```
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Por supuesto, podemos seguir simplemente pidiendo un valor como hemos hecho previamente:
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```
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> local.common_tags
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{
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"billing_code" = "FOO9999"
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"company" = "Lemoncode"
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"project" = "Lemoncode-web-app"
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}
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```
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## Clean Up
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```bash
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terraform destroy
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```

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