How-to use multiple versions of a Terraform provider in one configuration

The configuration will support and use different versions of a Terraform provider within the same Terraform setup, enabling the management of resources with the appropriate provider version.

At times it may be useful to have multiple versions of the same provider in one configuration. For example, if there is a regression in a new provider version in one resource, but that new version has a new resource that is necessary in that same configuration.

Procedure

terraform {
  required_providers {
    aws = {
    source = "hashicorp/aws"
    version = ">= 3.0.0"
    }
    aws_v2 = {
    source = "hashicorp/aws"
    version = ">= 2.0.0, < 3.0.0"
    }
  }
}

• Configure Provider Aliases: Define the provider configurations with aliases to distinguish between different versions.

provider "aws" {
  alias = "aws_v3"
  region = "us-west-2"
}

provider "aws" {
  alias = "aws_v2"
  region = "us-east-1"
}

• Use Providers in Modules: Specify the provider alias in the providers block of the modules to use the appropriate provider version.

module "module_using_aws_v3" {
  source = "./module_using_aws_v3"
  providers = {
  aws = aws.aws_v3
  }
}

module "module_using_aws_v2" {
  source = "./module_using_aws_v2"
  providers = {
  aws = aws.aws_v2
  }
}