Terraform Forces New Resource each time

[mckayjuk]

Each time I run my plan, my existing servers are destroyed and new ones built. Looking through the log a number of entries have 'forces new resource' next to them... listed below

-/+ aws_instance.Web[0] (new resource required)
id: "i-0b5e13fdd020b0917" => (forces new resource)
security_groups.#: "0" => "1" (forces new resource)
security_groups.3026238325: "" => "sg-a7ec92df" (forces new resource)

[mckayjuk]

Security Groups could be due to the following...

hashicorp/terraform#7039

I have been using Security Groups instead of vac_security groups.

Testing

[mckayjuk]

The instance ID appears to be related to

hashicorp/terraform#3449

Using elements seems to force a new build (and destroy the old)

Testing ListVar as noted in link above.

[mckayjuk]

Fixed by changing:

subnet_id = "${element(var.public-subnets, count.index)}" to .....
subnet_id = "${var.public-subnets [count.index]}"

I can now create upto as many machines as I state subnets... an improvement on how I would create 4 machines if only 3 subnets listed would be useful.

[mckayjuk]

Closing... improvement can be put on backlog.