Terraform

Terraform Tutorials: Basic Workflow Getting Started Guide

April 3, 2023 comments off
  • init – Init. Initialize the (local) Terraform environment. Usually executed only once per session.
  • plan – Plan. Compare the Terraform state with the as-is state in the cloud, build and display an execution plan. This does not change change the deployment (read-only).
  • apply – Apply the plan from the plan phase. This potentially changes the deployment (read and write).
  • destroy – Destroy all resources that are governed by this specific terraform environment.

Terraform workflow

Step – 1 – Install terraform

Terraform Install & Configurations

Step – 2 – Decide a providers name which you want to work with?

  • Create one directory under your workspace
  • Inside directory, create one file called “providers.tf”
  • Content of the providers.tf are as follow
  • run init command to download aws providers. $ terraform init
terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "4.61.0"
    }
	github = {
      source = "integrations/github"
      version = "5.18.3"
    }
  }
}

provider "aws" {
  region     = "us-east-1"
  access_key = ""
  secret_key = ""
}

provider "github" {
  # Configuration options
}

Step – 3 – Create 1 AWS ec2 instance using Terraform

  • Create aws.tf file in the same directory where providers.tf is located
  • Put the following content. Modify AMI id as per your region
resource "aws_instance" "web" {
  ami           = "ami-007855ac798b5175e"
  instance_type = "t2.micro"

  tags = {
    Name = "HelloWorld-DevOpsSchool"
  }
}

Step – 4 – PLAN (DRY RUN) using terraform plan

  • RUN a Dry run command $ terraform plan

Step – 5 – APPLY (Create a Resoureces) using terraform apply

  • Run apply command to create resources $ terraform apply

Step – 6 – Verify a AWS ec2 instance at AWS

Step – 7 – APPLY (Update a Resoureces) using terraform apply

  • Update tag info in your aws.tf code
  • Run $ terraform apply
resource "aws_instance" "web" {
  ami           = "ami-007855ac798b5175e"
  instance_type = "t2.micro"

  tags = {
    Name = "HelloWorld-Terraform"
  }
}

Step – 8 – Terraform show

Check Statefile in the same directory

Step – 9 – Terraform destroy

Check AWS Account if AWS ec2-instance is destroyed or not

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