# Terraform Workshop


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## What is Terraform

IaC (Infrastructure as Code) framework which enables programatic definition,
deployment and management of infrastructure resources for cloud and on-premises 
in a declarative manner. It targets all major cloud platforms (GCP, AWS, Azure, DO etc.)

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## Why do We Need it

* Standardization of deployment to ensure a consistent state
    * Version control
    * Deploying an additional clone env for testing

* Easier auditability to improve quality and security
    * Modular - reuse & ease of understanding
    * Resource Graph (dependency graph + parallel execution when possible)
    * Version control

* Enables use of hardened deployment pipelines

* Enables immutable infrastructure

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## Human-Readible Configuration Language

* HashiCorp Configuration Language (HCL) or JSON

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

resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0"  # Amazon Linux 2 AMI ID
  instance_type = "t2.micro"

  tags = {
    Name = "HelloWorldEC2Instance"
  }
}

output "instance_public_ip" {
  value = aws_instance.example.public_ip
}

``` 

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## Workflow

* Write your configuration file

* Use the the `terraform plan` action to simulate deployment of resources and assess the outcome

* Use `terraform apply` to actually deploy resources

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# Exercise

* Set up local credentials for your cloud platform of choice

* Write a file that deploys an EC2 instance

* Use `terraform plan` and `terraform apply` in order to deploy the resource

* Remove the resource by updating your configuration file and using `terraform plan` and `terraform apply`

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# Extend Configuration

* Add a VPC

* Define security group that limits ingress and egress to port 22

* Add SSH key(s) which may connect to the instance

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# Next Steps

* ...