How Terraform will create resources in multi-region

Terraform can manage resources across multiple regions by configuring the provider

blocks and specifying the regions where resources should be created.

1. Define Multiple Providers

You need to define multiple provider blocks in your Terraform configuration file, each specifying a different region. Here’s an example for AWS:

provider "aws" 
{ 
    alias = "us_east_1"
    region = "us-east-1"
}
provider "aws" 
{ 
    alias = "us_west_1"
    region = "us-west-1"
}   

In this example, two providers are defined: one for the us-east-1 region and another for the us-west-1 region. You can make use of alias keyword to implement multi region infrastructure setup in terraform.

1. Specify Providers in Resource Definitions

When defining resources, you need to specify which provider should be used. This is done using the provider argument within the resource block:

resource "aws_instance" "example_us_east" {
  provider = aws.us_east_1
  ami           = "ami-05cddo*****"
  instance_type = "t2.micro"
}

resource "aws_instance" "example_us_west" {
  provider = aws.us_west_1
  ami           = "ami-05cddo*****"
  instance_type = "t2.micro"
}

In this configuration:

• The aws_instance.example_us_east resource will be created in the

us-east-1 region.

• The aws_instance.example_us_west resource will be created in the

us-west-1 region.

1. Initialize and Apply

After configuring the providers and resources, initialize your Terraform workspace and apply the configuration:

terraform init

terraform apply

Terraform will create resources in the specified regions based on your configuration.

Summary

• Define multiple providers: Create separate provider blocks for each region you need.

Reference providers in resources: Use the provider argument within resource blocks to specify which provider (and thus which region) to use.