DevOps Classroom Series – 04/Aug/2021

Installing Terraform

• Terraform can be installed on any system.

choco install terraform -y

• Terms:

  • Provider: Terraform providers help in creating infrastructure in Cloud/Hypervisors or other types. Each Providers will have Resource Types and DataSources Added
  • Resource:
    • This represents the infrastructure element which you want to create.
  • Argument: Inputs passed to the Resource are referred as arguments
  • Attribute: Outputs are referred as Attributes
  • DataSource: Terraform allows to fetch information from provider by a special kind of resource called as DataSource

• Syntax: To Create resources with Terraform we need to specify the resources, providers etc in some files. To write Terraform supports two configuration syntax

  • Configuration Syntax: Native grammar of Terraform Language
  • JSON Configuration:

• Provider syntax:

provider "<provider name>" {
    argument1 = "value1"
    ...
    argumentn = "valuen"
}

• Provider example

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

provider "azurerm" {
  features {}
}

• resources syntax:

resource "<resource_type>" "<NAME>" {
    argument1 = "value1"
    ...
    argumentn = "valuen"
}

• resource example

resource "aws_instance" "example" {
    ami     = "ami-0782463"
    instance_type = "t2.micro"
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

• Workflow with terraform:
  • Find the Provider
  • In Provider find the resource types to match your needs
  • Express providers and resource types in a file with .tf extension in a new folder
  • Execute some terraform commands

  terraform init
  terraform validate
  terraform apply
  

Scenario-1: Create an S3 Bucket in AWS

• Manual Steps:
  • Login into AWS Account & Navigate to S3
• Working with terraform
  • Create a new folder and open that folder with visual studio code
  • Prepare visual studio code for terraform
  • Create a new file called as main.tf
  • Since we are working to create resource called as s3 bucket in AWS. We need to find a provider for AWS Refer Here
  • We need to configure the AWS Provider and terraform needs to authenticate (login) into our AWS account and create resources. To do this we need to have some kind of credentials
  • For authentication with AWS Refer Here
  • To Create a user and get the credentials to be used in terraform Refer Here
  • In the main.tf file add the access key and secret to the aws provider

    terraform {
    required_providers {
        aws = {
        source  = "hashicorp/aws"
        version = "~> 3.0"
        }
    }
    }
  
    provider "aws" {
        region      = "ap-south-1"
        access_key  = "<your access key here>"
        secret_key  = "<your secret access key here>"
    
    }
  

  • Find an s3 bucket resource
  • The s3 bucket resource type found is Refer Here
  • Add the following to the main.tf

  # Resource for s3
  
    resource "aws_s3_bucket" "my_bucket" {
        bucket = "qts3fromtf"
    
    }
  

  • Lets execute the commands to download the providers

  terraform init
  

  
  • Now lets validate our terraform configuration
  • Now lets ask terraform to create the resource by executing apply
  • We can destroy whatever we have created using terraform destroy