How do I add two S3 backend to two different environments using terragrunt.hcl?

[shreyas-wego]

Hi Team,

We are having two different environments Staging and Production and we are maintaining staging.tfvars and production.tfvars respectively. We want to store our state files in S3 backend into two different buckets in Staging and Production accounts respectively.

Is it possible to just have 1 terragrunt.hcl file to add two remote_state configurations? Any suggestions would be helpful.

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Tracked in ticket #109916

[ellisonc]

Take a look at the example repo. In the top level terragrunt.hcl file we are building the bucket name and key using local variables from account.hcl, region.hcl, and env.hcl. You could use this same pattern to set the bucket name on a per-environment basis. Your terragrunt file might look something like:

locals {
  ...
  # Automatically load environment-level variables
  environment_vars = read_terragrunt_config(find_in_parent_folders("env.hcl"))

  # Extract the variables we need for easy access
  ...
  env = local.environment_vars.locals.environment
}
...
# Configure Terragrunt to automatically store tfstate files in an S3 bucket
remote_state {
  backend = "s3"
  config = {
    ...
    bucket = "${local.env}-terragrunt-example-terraform-state-${local.account_name}-${local.aws_region}"
    ...
  }
  ...
}
...

[shreyas-wego]

Hi @ellisonc thank you for the response. I have one more question here, is there a way to dynamically pass the AWS profile name associated to a particular account?

[ellisonc]

@shreyas-wego Yes, if you take a look at the same repo from earlier the sub-folders contain account.hcl files. At gruntwork we use these files for account specific variables like aws_profile. In the top level terragrunt.hcl that variable would be available as local.account_vars.locals.aws_profile

[shreyas-wego]

Thank you @ellisonc although I didn't local.account_vars.locals.aws_profile in top level terragrunt.hcl file but I understood the flow of how things are working. I will definitely try this out and let you know on this thread on how it goes. Thanks again! Have a good day!