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Terragrunt generate block

Why

When creating repeatable DRY terraform, we will use a terragrunt generate block

How

Terragrunt generate block has several features:

  • Overwrite
  • Skip
generate "exmaple" {
  path      = "example.tf"
  if_exists = "overwrite"
  contents = <<EOF
output "ip-address" {
  value = google_compute_global_address.example.address
}
EOF
}

The below will then skip re-creating the file if it exists already. This is useful for templating out repos.

generate "exmaple" {
  path      = "example.tf"
  if_exists = "skip"
  contents = <<EOF
output "ip-address" {
  value = google_compute_global_address.example.address
}
EOF
}

How to use it

You will then need to create a file called terragrunt.hcl in a new folder and paste in the below

include "root" {
  path           = find_in_parent_folders()
  expose         = true
  merge_strategy = "deep"
}

Using the below structure, when we run terragrunt run-all init it will create the file example.tf in each directory

.
├── dev
│   └── terragrunt.hcl
├── prd
│   └── terragrunt.hcl
├── terragrunt.hcl
└── test
    └── terragrunt.hcl
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