module variable

module1/module1.tf

@@ -2,11 +2,14 @@ provider "aws" {
   region = "eu-west-2"
 }
 
-resource "aws_instance" "cedric-instance1" {
+variable "instance_name" {}
+
+resource "aws_instance" "instance1" {
   ami           = "ami-01a6e31ac994bbc09"
   instance_type = "t2.micro"
   key_name      = "cedric"
   tags = {
-    Name = "cedric-module-instance1"
+    Name = "${var.instance_name}"
   }
 }
+

project4/base.tf

@@ -1,3 +1,4 @@
 module "my_module" {
   source = "../module1"
+  instance_name = "cedric-instance1"
 }