Terragrunt: use different AWS profile in same plan/apply

Hi,

I’m new to terragrunt and I am wondering if it possible for terragrunt to use multiple AWS profiles in the same run.

Given the following workspace dir struct:

terragrunt-workspace/aws/account-dev/terragrunt.hcl
terragrunt-workspace/aws/account-dev/eu-west-1/terragrunt.hcl main.tf ... etc
terragrunt-workspace/aws/account-dev/eu-west-3/terragrunt.hcl main.tf ... etc
terragrunt-workspace/aws/account-prod/terragrunt.hcl
terragrunt-workspace/aws/account-prod/eu-west-1/terragrunt.hcl main.tf ... etc
terragrunt-workspace/aws/account-prod/eu-west-3/terragrunt.hcl main.tf ... etc

terragrunt-workspace/aws/<account>/terragrunt.hcl looks like:

remote_state {
  backend = "s3"
  config  = {
    profile        = "<account>"
    bucket         = "<account>-terragrunt"
    key            = "${path_relative_to_include()}/terraform.tfstate"
    region         = "eu-west-3"
    encrypt        = true
    dynamodb_table = "<account>-terragrunt"
  }
}

terragrunt-workspace/aws/<account>/<region>/terragrunt.hcl looks like:

include {
  path = find_in_parent_folders()
}

I’m looking for a way to tell terragrunt that is ran from terragrunt-workspace/aws to use a specific AWS_PROFILE for each account but so far I came up empty.

Regards.

So your region attribute in the remote_state needs to refer to a var:

region = var.region

Then you need to set that var in your “terragrunt-workspace/aws//terragrunt.hcl”.
I would do that either by:

  • Clean but more files: create a “region.hcl” config file inside each region folder with the following locals:
locals{
  region = "eu-west-1"
}

Then inside your “root” terragrunt.hcl (terragrunt-workspace/aws//terragrunt.hcl) you load and use that var:

locals{
  region_vars = read_terragrunt_config("region.hcl")
  region = local.region_vars.locals.region
}
  • Extract it from the path (not tested):

locals{
// Extracting “eu-west-X” from the path by cutting on ‘/’
path_array = path_relative_to_include().split(’/’)
region = element(path_array, length(path_array)-1)
}

What Luigi_Bakker said is the right approach here. You basically need to load in the data you need by taking advantage of the folder structure. The one thing I will add is that you can use find_in_parent_folder to load the data file in the parent config.

E.g.,

locals {
  profile = read_terragrunt_config(find_in_parent_folders("profile.hcl"))
}

remote_state {
  backend = "s3"
  config  = {
    profile        = local.profile.locals.account
    bucket         = "<account>-terragrunt"
    key            = "${path_relative_to_include()}/terraform.tfstate"
    region         = "eu-west-3"
    encrypt        = true
    dynamodb_table = "<account>-terragrunt"
  }
}

where profile.hcl is in terragrunt-workspace/aws/<account>/profile.hcl.