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Terraform Block

Step-01: Introduction

  • Understand about Terraform Block and its importance
  • Understand how to handle version constraints for Terraform Version and Provider Version in Terraform Block

Step-02: Understand about Terraform Settings Block

  • Required Terraform Version
  • Provider Requirements
  • Terraform backends
  • Experimental Language Features
  • Passing Metadata to Providers
  • Review the file named sample-terraform-settings.tf for more understading

Step-03: Create a simple terraform block and play with required_version

  • required_version focuses on underlying Terraform CLI installed on your desktop
  • If the running version of Terraform on your local desktop doesn't match the constraints specified in your terraform block, Terraform will produce an error and exit without taking any further actions.
  • By changing the versions try terraform init and observe whats happening
Play with Terraform Version
  required_version = "~> 0.14.3" 
  required_version = "= 0.14.3"    
  required_version = "= 0.14.4"  
  required_version = ">= 0.13"   
  required_version = "= 0.13"    
  required_version = "~> 0.13"   


# Terraform Block
terraform {
  required_version = "~> 0.14"
}

# To view my Terraform CLI Version installed on my desktop
terraform version

# Initialize Terraform
terraform init

Step-04: Add Provider and play with Provider version

  • required_providers block specifies all of the providers required by the current module, mapping each local provider name to a source address and a version constraint.
Play with Provider Version
      version = "~> 3.0"            
      version = ">= 3.0.0, < 3.1.0"
      version = ">= 3.0.0, <= 3.1.0"
      version = "~> 2.0"
      version = "~> 3.0"   

# Terraform Init with upgrade option to change provider version
terraform init -upgrade

Step-05: Clean-Up

# Delete Terraform Folders & Files
rm -rf .terraform*

References