2021-04-22-terragrunt-notes

you can define your backend configuration just once in the root terragrunt.hcl file

 # stage/terragrunt.hcl

      remote_state {
        backend = "s3"
        generate = {
        path      = "backend.tf"
        if_exists = "overwrite_terragrunt"
      }
      config = {
        bucket = "my-terraform-state"

        key = "${path_relative_to_include()}/terraform.tfstate"
        region         = "us-east-1"
        encrypt        = true
        dynamodb_table = "my-lock-table"
      }
    }

The generate attribute is used to inform Terragrunt to generate the Terraform code for configuring the backend. When you run any Terragrunt command, Terragrunt will generate a backend.tf file with the contents set to the terraform block that configures the s3 backend, just like what we had before in each main.tf file. The final step is to update each of the child terragrunt.hcl files to tell them to include the configuration from the root terragrunt.hcl:

# stage/mysql/terragrunt.hcl

  include {
    path = find_in_parent_folders()
  }