I want to use output variables of one resource/module as an input to another resource/modules. Is that possible? Here i want the output value from 'outputs.tf' in root to be used as input in 'main.tf' of module.
root
|--main.tf
|--vars.tf
|--outputs.tf
|---module
|--main.tf
|--vars.tf
Of course you can. And there is nothing more you need to do. Just do it as usual. Here is an example:
main.tf
├── rg
│ ├── output.tf
│ └── rg.tf
└── vnet
├── output.tf
└── vnet.tf
You create the modules rg and vnet as it does. Set the output you need. Here I set the output rg_name and rg_location. And I also set the variables rg_name and rg_location in the module vnet as need. Then the main.rf shows here:
provider "azurerm" {
features {}
}
module "rg" {
source = "./rg"
rg_name = "charlesTerraform"
}
module "vnet" {
source = "./vnet"
rg_name = module.rg.rg_name
rg_location = module.rg.rg_location
}
output "vnet" {
value = module.vnet.vnet
}
You see, I use the output of the module rg as input for the module vnet. Hope it help you understand the Terraform modules.
Update:
It's also the same way when the structure is the thing you said. You just need to input the output you need into the module. For example:
resource "azurerm_resource_group" "example" {
name = "xxxxxx"
location = "xxxx"
}
module "vnet" {
source = "./modules"
resource_group = azurerm_resource_group.example.name
}
This is just an example, but it shows you how to achieve it. Hope you understand.
I think you can use the terraform output command to interpolate output value to other means as variables.
See this terraform docs https://www.terraform.io/cli/commands/output