Change Infrastructure
Now that we have random_pet created, let’s modify it. Here’s the demo/main.tf again.
app/stacks/demo/main.tf
module "pet" {
source = "../../modules/example"
length = var.length
}
As you can see there’s a var.length variable. One way to update the infrastructure is to change the variable in the variables.tf file directly.
app/stacks/demo/variables.tf
variable "length" {
type = number
description = "number of words"
default = 2
}
However, you can also use tfvars files. Terraspace will automatically use config/stacks/demo/tfvars files according the TS_ENV value. The default value is TS_ENV=dev. We’ll use tfvars files so we can use the same code for different environments.
Generate Starter Tfvars Files
Addtionally, Terraspace can generate starter tfvar files for us with the terraspace seed command.
$ terraspace seed demo
Reading: .terraspace-cache/us-west-2/dev/stacks/demo/variables.tf
create config/stacks/demo/tfvars/dev.tfvars
$
The produced file looks something like this:
config/stacks/demo/tfvars/dev.tfvars
# Optional variables:
# length = "2"
Terraspace parses the demo/variables.tf file to generate the tfvars/dev.tfvars file. It detected that all the variables are optional. We’ll uncomment length and change it to length = 3.
config/stacks/demo/tfvars/dev.tfvars
# length = "3" # <= was changed
Next, we’ll update the infrastructure.
