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Terraform ​

shell
$ terraform init     # init .terraform folder with files
$ terraform validate # check configuration
$ terraform plan     # show changes
$ terraform apply    # apply changes
$ terraform destroy  # remove oldest infrastructure
yaml
# terraform.tf – Configuration file
terraform {
	required_providers {
		aws = {
			source  = "hashicorp/aws"
			version = "~> 4.16"
		}
	}
	required_version = ">= 1.2.0"
}

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

resource "aws_instance" "example" {
  ami           = "ami-830c94e3" # Ubuntu server
  instance_type = "t2.micro"

  tags = {
    Name = "ExampleAppServerInstance"
  }
}

resource "aws_security_group" "instance" {
	name = "terraform-example-instance"
	ingress {
		from_port   = 8080
		to_port     = 8080
		protocol    = "tcp"
		cidy_blocks = ["0.0.0.0/0"]
	}
}

Concepts ​

  • Modules – Container for multiple resources that are used together
  • Execution plan – What operations to do to reach the desired state
  • Providers – Plugins that talks to specific cloud platform via its API
  • State file – terraform.tfstate
    • Maps between TF name and resource identification in the cloud
    • Track resource dependencies for deletion
    • Used as cache to avoid query all resources in the cloud

Resources ​