N-Tier Application

• Consider the following architecture of a typical web application (ticket booking)
  
• To realize this application on AWS, the high level overview is as shown below
  
• To realize this application on Azure, the high level overview is as shown below
  

WOW (Ways of Working)

• Lets realize the architecture manually, make a note of
  • resource
  • inputs
  • outputs
• Find resources in Terraform to acheive the above manual steps

Configuring a Provider in Terraform

Install Terraform on a linux machine

• Create a linux vm and ssh into it and execute the steps based on your distribution from here Refer Here
  

AWS Provider

• Terraform aws provider uses the AWS APIs to get the infra created.
• To Create infrastructure in your AWS Account, it needs AWS programatic credentials (Secret key and access key)
• To configure these keys Refer Here
• Create IAM Secret key and access key Refer Here for manual steps
• Lets write provider configuration

provider "aws" {
    region = "us-west-2"
    access_key = "AKIAZ4ECZC3PP5DPPHG6"
    secret_key = "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"
}

• This is not a great way as we are having sensitive information in the text format.
• Best way is to install aws cli on the machine with terraform and terraform will automatically pickup credentials from there.
• Installing aws cli Refer Here
• Now your provider can be as simple as

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