DevOps Classroom Series – 07/Oct/2020

Developer Environment for Terraform

• Refer Here for installing necessary softwares for this course
• Install Terraform:
  • Windows Machine:
    • Refer Here for offical downloads page
    • For installing and configuring Windows Terminal Refer Here
    • for installing chocolatey Refer Here
    • Installation steps

    choco install terraform -y
    refreshenv.cmd
    terraform --version
    

Working with Terraform

• For offical docs Refer Here
• To start working with terraform we need to understand
  • Provider:
    • The virtual environment where you want to create resources
    • Provider configuration will vary from vendor to other.
    • You will also need to setup credential info in terraform to communicate with Provider
  • Resource: The infrastructure to be created.
  • Arguments: arguments are inputs provided to terraform blocks (resource)
  • Attributes: outputs from terraform block (resource)
• Basic Workflow
• For all the providers supported by terraform Refer Here
• Steps for working with terraform
  • Make a note of manual steps for creating infrastructure
  • Configure the Provider with required credentials
  • Create a folder and start writing the resources which you want to create in a declarative style following terraform syntax

Experiment-1: Lets create a S3 bucket in AWS Cloud

• Manual Steps:
• Lets try to configure aws Provider:
  • Refer Here for official docs on configuring aws credentials
  • To get access key & secret key Refer Here
• Create a new folder "hello-tf"
• Now lets configure visual studio code to help us in writing terraform
• Create a file called as main.tf
• Add provider and Refer Here
• Configure your aws provider with access_key and secret key

provider "aws" {
    region      = "us-west-2"
    access_key  = "<your access key>"
    secret_key  = "<your secret key>"
}

• So we need to create a resource s3 bucket Refer Here.
• To write a basic resource the syntax is

resource "<resource type>" "<name>" {
    argument1   = value1
    ...
    argumentn   = value n
}

• Lets add s3 resource defintion

resource "aws_s3_bucket" "mybucket" {
    bucket      = "qts3fromtf"
    tags = {
    Name        = "My bucket"
    Environment = "Dev"
    CreatedBy   = "Terraform"
  }
}

• Now navigate to command line and execute

terraform --help # Get to know terraform command line
terraform init --help
terraform init . # this command will download providers to your machine
terraform validate --help
terraform validate .
terraform apply --help
terraform apply .

• We have initialized (one time operation in a new folder)
• Configured the provider & then declared the resource, then we have validated and applied the template
• If you want to delete whatever is created
• For sample used in classroom Refer Here