terraform_ubuntu_ec2_pem.tf

# Terraform: How to create five instances on Amazon Web Services
# and define the name tag individually using a list type variable.
# It is just a simple example of how to create a given instance 
# number and set the names according to the size of the list.

data "aws_ami" "ubuntu" {
  most_recent = true

  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }

  owners = ["099720109477"] # Ubuntu
}

resource "aws_instance" "web" {
  ami                         = data.aws_ami.ubuntu.id
  instance_type               = "t2.micro"
  count                       = length(var.instance_names) # number of instances desired to create within the EC2 service on Amazon Web Services
  associate_public_ip_address = true                       # Associate with a passkey (pem file)
  key_name                    = "key_pem_name"             # Name of the key previously created within the Amazon Web Services IAM service


  tags = {
    Name = var.instance_names[count.index] # Using each item in the list to name the instances created
  }
}

# Configuration of the default region where to create the instances
provider "aws" {
  region = "sa-east-1"
}

terraform {
  # Configuration to use state within a bucket
  backend "s3" {
    bucket = "bucketanme"
    key    = "terraform-test.tfstate"
    region = "sa-east-1"
  }

  # Sets the minimum version of the aws plugin
  required_providers {
    aws = {
      version = "~> 2.0"
      source  = "hashicorp/aws"
    }
  }
}


# Returns the public DNS of each instance created on Amazon Web Services
output "dns_name" {
  value = aws_instance.web.*.public_dns
}


# Create a list that will be used to name each instance
variable "instance_names" {
  type    = list(any)
  default = ["Jenkins", "Grafana", "Prometheus", "Zabbix", "netdata"]
}