Help to create structure

[GyroGearl00se]

Hi Community,

I'm looking for a way to manage multiple servers (each with the same application) with a "terragrunt run-all plan/apply".

I've written my own terraform provider which is already working quite well. At the moment I'm stuck with the conception of the path structures and the automation part :)

Here the idea:

.
├── instance
│ ├── common_vars.hcl
│ ├── dev
│ │ ├── serverA
│ │ │ └── terragrunt.hcl
│ │ ├── serverB
│ │ │ └── terragrunt.hcl
│ │ ├── serverC
│ │ │ └── terragrunt.hcl
│ ├── prod
│ │ ├── serverX
│ │ │ └── terragrunt.hcl
│ │ ├── serverY
│ │ │ └── terragrunt.hcl
│ │ ├── serverZ
│ │ │ └── terragrunt.hcl
├── main.tf
└── terragrunt.hcl

I was hoping I could define in the main.tf the provider and the required resources.

In the common_vars.hcl I was thinking to define default values for the resources.

In the terragrung.hcl in the subdirectories I'd like to define variables in case I want to override any from the common_vars.

Can you please advise me if this expectation is doable with the way I'm approaching ? Or do I have to set it up differently ?

---

Tracked in ticket #109371

[GyroGearl00se]

I've made progress with the following:

.
├── instance
│ ├── dev
│ │ ├── ServerA
│ │ │ └── terragrunt.hcl
│ │ ├── ServerB
│ │ │ └── terragrunt.hcl
│ │ └── ServerC
│ │ └── terragrunt.hcl
├── modules
│ └── customModule
│ . . └── main.tf
└── terragrunt.hcl

the terragrunt.hcl in root dir is empty.
and each terragrunt.hcl within the sub directories contain the following:

`include "root" {
path = find_in_parent_folders()
}

terraform {
source = "${dirname(find_in_parent_folders())}/modules/customModule/main.tf//."
}

inputs = {
hostname = ""serverA.local
}`

The main.tf contains the required terraform_providers (my custom provider), the defined resources & the default variables for each resource.

So far it seems to work now.

If anyone else still has another suggestion. Feel free to advise :)

[denis256]

Hi,
to reduce duplications, terraform block and default inputs can be extracted in HCL file in the root directory:

# root.hcl
# common terraform module
terraform {
  source = "${get_terragrunt_dir()}/../module"
}

# default input
inputs = {
  file = "${get_terragrunt_dir()}/file.txt"
}

# server1/terragrunt.hcl

include "root" {
  path = find_in_parent_folders("root.hcl")
}

inputs = {
  content = "server1"
}

# server2/terragrunt.hcl

include "root" {
  path = find_in_parent_folders("root.hcl")
}

inputs = {
  content = "server2"
}

Created simplified example in: https://github.com/denis256/terragrunt-tests/tree/master/common-module

[GyroGearl00se]

I tried before to adapt the official example (terragrunt-infrastructure-live-example) which unfortunately didn't work for me.
Even without changing anything it was not able to find some references.

But this solution is for my usecase a lot more suitable and works as expected. Thank you very much.