Handling resource updates

Let's change our instance's name to be hello-updated-instance:

resource "aws_instance" "hello-instance" {  ami = "ami-9bf712f4"  instance_type = "t2.micro"  subnet_id = "subnet-5f22f536"  tags {    Name = "hello-update-instance"  }}

Before we actually run the update, wouldn't it be useful to see what exactly Terraform do when we run the terraform apply command again? Luckily, there is the terraform plan command that does exactly the same, that is, it shows you what applying do by checking the template, state file, and actual state of the resource:

$> terraform planRefreshing Terraform state in-memory prior to plan...The refreshed state will be used to calculate this plan, butwill not be persisted to local or remote state storage.aws_instance.hello-instance: Refreshing state... (ID: i-119a10ac)The Terraform execution plan has been generated and is shown below.Resources are shown in alphabetical order for quick scanning. Green resourceswill be created (or destroyed...