Terraform coerces the literal booleans false
and true
(e.g., when used as variable values) to 0 and 1 respectively. As a result, this ternary expression:
count = "${var.myboolean == true ? 1 : 0}"
unexpectedly always evaluates to 0
. You want to use
count = "${var.myboolean ? 1 : 0}"
Or even just
count = "${var.myboolean}"
if that meets your readability standards.
Being loose with type coercion has its drawbacks...