In Terraform, variables are referred to using the syntax var.<variable_name>. Here, var is a special namespace that contains all input variables.
For example, if you have a variable named num_servers in your configuration and you want to pass it to a module, you would do it like this:
variable "num_servers" {
description = "The number of servers to create"
default = 5
}
module "server_module" {
source = "app.terraform.io/example/server"
version = "1.0.0"
servers = var.num_servers
}
In the above example, the input variable num_servers is defined with a default value of 5. Then, the server_module is being called and the servers argument is being set to the value of var.num_servers, which is 5.
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