Terraform :3

DevOps Classroom Series – 25/Feb/2021

Scenario: Lets create the following architecture in AWS

• The first version of the architecture to be created using terraform looks as shown below 
• So before we start working on terraform, we should know how to manually create it.     
• Now lets try to acheive the same from terraform
• Create a new folder and in that folder create a terraform file main.tf
• In todays example lets not hard code the access_key and secret_key
• So lets create Environmental Variables
  • AWS_ACCESS_KEY_ID
  • AWS_SECRET_ACCESS_KEY
• To set environmental variables in Linux

export AWS_ACCESS_KEY_ID="anaccesskey"
export AWS_SECRET_ACCESS_KEY="asecretkey"

• To set environmental variables in windows powershell

$env:AWS_ACCESS_KEY_ID="youraccesskey"
$env:AWS_SECRET_ACCESS_KEY="your secret key"

• Now perform init

terraform init

• Validate the template

terraform validate .

• Now lets create the resources by executing terraform apply .  
• Now lets verify the vpc manually in the aws console 
• Now lets just apply terraform apply . again 
• Terraform will apply only when there is need to create resources, if the resources are already created and have the same values as you mentioned, terraform will not do anything.
• Refer Here for the changes
• Now lets make small change in aws vpc to enable dns support Refer Here for the changes   
• Now lets view the contents of the folder, some new files got generated during apply 
• Lets understand the importance the files generated in our next session.