module output

module1/module1.tf

@@ -13,3 +13,7 @@ resource "aws_instance" "instance1" {
   }
 }
 
+output "instance1_public_ip" {
+  value = aws_instance.instance1.public_ip
+}
+

project4/base.tf

@@ -2,3 +2,8 @@ module "my_module" {
   source = "../module1"
   instance_name = "cedric-instance1"
 }
+
+output "ip" {
+  description = "public IP of the instance"
+  value = module.my_module.instance1_public_ip
+}