Is there a way to put the terraform backend configuration in a module?

Question

All my terraform files start with:

terraform {
  required_version = ">= 0.11, < 0.12"
  backend "s3" {
    bucket  = "my-terraform-state"
    key     = "my-service/my-component/terraform.tfstate"
    region  = "eu-west-1"
    encrypt = "true"
  }
}

provider "aws" {
  region = "eu-west-1"
  version = ">= 1.8, < 1.9"
}

What I would like is something like

module "header" {
  source = "module-location"
  region = "eu-west-1"
  state_key = "my-service/my-component"
}

When I try something like this it fails with the message that the backend configuration cannot contain variables. I also read about the read-only state and noticed that it can contain variables.

I am not smart · Accepted Answer · 2018-02-10 20:11:33Z

1

You can have a singe file called terraform.tf:

terraform {
  required_version = ">= 0.11, < 0.12"
  backend "s3" {
    bucket  = "my-terraform-state"
    key     = "my-service/my-component/terraform.tfstate"
    region  = "eu-west-1"
    encrypt = "true"
  }
}

and a provider.tf:

provider "aws" {
  region = "eu-west-1"
  version = ">= 1.8, < 1.9"
}

Place these files in the root dir. Terraform will use them and you no longer need to have those headings at the top of each file.

You can not use variables / interpolation in terraform.tf, as this file is used very early by terraform.

answered Feb 10, 2018 at 20:11

I am not smart

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1 Comment

Maddin Over a year ago

Thanks for your answer. But wouldn't all components share the same state file, thus losing the advantage of storing the state per component?

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