DevOps Classroomnotes 18/May/2022

Installing Terraform

• Windows: We have two options for installing terraform
  • Chocolatey:
    • Install chocolatey Refer Here
    • Use Chocolatey to install terraform choco install terraform
  • Manually configure terraform Refer Here
• Mac: Refer Here brew install terraform

Working with Terraform

• Identify the infrastructure you need to create/provision
• Identify the providers
• Configure the provider using HCL (Hashicorp Configuration Language)
• Configure the resources to be created using HCL

Activity 1: Create an S3 Bucket in AWS

• Manual Steps: Login to the AWS Account
  
  
  
  
  
  
  
• Provider is where to create infra and Resource is what we are trying to create.
• In the above case
  • Provider: AWS
  • Resource: S3 Bucket
• In AWS to connect to aws account we had to login using email and password.
• Generally Provider configuration involves authentication and it depends on how provider allows it.
• Refer Here for the terraform providers
• AWS Provider documentation
  
• To work with AWS Provider we need access key and secret key, lets see how to generate it Refer Here
• Refer Here for the documentation of the s3 bucket
• Now lets try to create infra from terraform
  
• Initialize the directory
  
• Validate the configuration
  
• Now lets create the infrastructure terraform apply
  
  
• Now to remove the infra terraform destroy
  
• The configuration which we used

provider "aws" {
    access_key  = "<your-access-key>"
    secret_key  = "<your-secret-key>"
    region      = "ap-south-1"
}

resource "aws_s3_bucket" "b" {
  bucket = "qt-tf-s3-1"

  tags = {
    Name        = "My bucket"
    Environment = "Dev"
  }
}

Terraform Language

• Terraform configuration can be expressed in
  • HCL/Terraform Language
  • JSON
• The two major elements in the Terraform language are
  • Arguments:
    • Assigns a value to a particular name bucket = "qt-tf-s3-1"
  • Blocks:
    • A block is container for other content
    • Three major blocks of terraform are
      • provider block
      • resource block
      • datasource block

Provider Block:

• Basic Syntax:

provider "<provider-name>" {
    <argument-1>
    <argument-2>
    ..
    <argument-n>
}

• Example

provider "aws" {
    access_key  = "LKJLKSKLJDALDJLKSADSLA"
    secret_key  = "lksdfjdlkasfjlsadfjlksdafjlksdafjdallksafj"
    region      = "ap-south-1"
}

Resource Block

• Basic Syntax

resource "<PROVIDER>_<TYPE>" "<NAME>" {
    <argument-1>
    <argument-2>
    ..
    <argument-n>
}

• Example

resource "aws_s3_bucket" "b" {
  bucket = "qt-tf-s3-1"

  tags = {
    Name        = "My bucket"
    Environment = "Dev"
  }
}

Cloud Account Creations

• Azure: Refer Here for the free account creation
• AWS: Refer Here