うまくいくprovider alias

acm.tf

data "aws_acm_certificate" "cert_global" {
  domain = "example.com"
  provider = "aws.virginia"
}

output "certificate" {
  value = "${data.aws_acm_certificate.cert_global.arn}"
}

main.tf

provider "aws" {
  region = "ap-northeast-1"
}

main_global.tf

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

override.tf

provider "aws" {
  region = "ap-northeast-1"
  profile = "my"
}