devops-exercises/topics/terraform/exercises/launch_ec2_instance/solution.md

Launch EC2 instance

Requirements

• AWS account

Objectives

1. Write Terraform configuration for launching an EC2 instance
2. Run the commands to apply the configuration and create the EC2 instance
3. What happens if you run again terraform apply?
4. Destroy the instance you've created with Terraform

Solution

mkdir exercise

cat << EOT >> main.tf
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 4.16"
    }
  }

  required_version = ">= 1.2.0"
}

provider "aws" {
  region  = "us-west-2"
}

resource "aws_instance" "app_server" {
  ami           = "ami-830c94e3"
  instance_type = "t2.micro"

  tags = {
    Name = "ExampleAppServerInstance"
  }
}
EOT

terraform init
terraform validate
terraform plan

# You should see this line at the end: Plan: 1 to add, 0 to change, 0 to destroy

terraform apply -auto-approve

# You should see the following output:
# aws_instance.app_server: Creation complete after 49s [id=i-004651a9d4427d236

# Running 'terraform apply' again won't change anything as
# Terraform will compare actual infrastructure to your
# configuration and won't find any difference. You should see the following line:
# Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

# Remove instance
terraform destroy -auto-approve

# Destroy complete! Resources: 1 destroyed.