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Terraform GCP Instance

Here’s a Terraform script for launching an instance in Google Cloud Platform.

provider "google" {
  project = "project-id"
  region  = "us-central1"
  zone    = "us-central1-a"
}
resource "google_compute_instance" "wiki" {
  name         = "wiki"
  machine_type = "n2-standard-1"
  zone         = "us-central1-a"
  tags         = ["web-server"]
  labels = {
    name        = "wiki"
    environment = "development"
  }
  boot_disk {
    initialize_params {
      image = "centos-7-v20210122"
    }
  }
  network_interface {
    network = "default"
    access_config {
    }
  }
  service_account {
    email  = "service-account@email.com"
    scopes = ["cloud-platform"]
  }
}

Here’s a few Terraform commands.

terraform init
terraform plan
terraform apply
terraform destroy

AWS LightSail Create Terraform

Here’s how to launch a LightSail instance using Terraform. Create a main.tf file.

terraform {
  required_providers {
    aws = {
      version = >= 3.22.0"
      source = "hashicorp/aws"
    }
  }
}
provider "aws" {
  profile = "default"
  region  = "us-east-1"
}
resource "aws_lightsail_instance" "yourinstance" {
  name              = "yourinstance"
  availability_zone = "us-east-1a"
  blueprint_id      = "amazon_linux_2"
  bundle_id         = "nano_2_0"
}

To launch, run the following Terraform commands.

terraform init
terraform apply

AWS EFS Create Terraform

Here’s how to build an EFS file system using Terraform. Create a main.tf file.

terraform {
  required_providers {
    aws = {
      version = ">= 3.22.0"
      source = "hashicorp/aws"
    }
  }
}
provider "aws" {
  profile = "default"
  region  = "us-east-1"
}
resource "aws_efs_file_system" "efs-test" {
   creation_token = "efs-test"
   performance_mode = "generalPurpose"
   throughput_mode = "bursting"
   encrypted = "true"
 tags = {
     Name = "efs-test"
   }
}
resource "aws_efs_mount_target" "efs-mt-example" {
   file_system_id  = aws_efs_file_system.efs-test.id
   subnet_id = "subnet-xxxxxxxxxxxxxxxxx"
   security_groups = ["sg-xxxxxxxxxxxxxxxxxx"]
}

To launch, run terraform.

terraform init
terraform apply

Terraform First Class Expressions

If you were running the older versions of Terraform, with release 0.12 and higher, there will be certain parts of your script that are no longer supported. Terraform uses expressions for dynamic configuration and dependencies. First-class expressions enable variables and operations to be performed outside of strings. In Terraform 0.11 and earlier all expressions were required to be part of interpolations in existing strings, such as “${var.foo}.

In Terraform 0.11.

resource "aws_instance" "example" {
  ami           = "${var.ami}"
  instance_type = "${var.instance_type}"
}

In Terraform 0.12.

resource "aws_instance" "example" {
  ami           = var.ami
  instance_type = var.instance_type
}

Gone are quotes, curly braces and the $ sign.

Terraform Launch EC2 Instance

Here’s the template for launching an EC2 instance via Terraform.

provider "aws" {
  region                  = "us-east-1"
  shared_credentials_file = "/home/username/.aws/credentials"
  profile                 = "default"
}
resource "aws_security_group" "hostname-sg" {
	name = "allow ssh"
	vpc_id = ""
	ingress {
		cidr_blocks = [ "10.0.0.0/8" ]
		from_port = 22
		to_port = 22
		protocol = "tcp"
	}
	egress {
		from_port = 0
		to_port = 0
		protocol = "-1"
		cidr_blocks = [ "0.0.0.0/0" ]
	}
}
resource "aws_instance" "hostname" {
	ami = "ami-xxxxxxxxxx"
	key_name = "your-key"
	instance_type = "t2.large"
	subnet_id = "subnet-xxxxxxxx"
	security_groups	= ["${aws_security_group.hostname-sg.id}"]
	tags {
		Name = "hostname"
		Environment = "development"
	}
}