today-i-learnt

Modules depends on

Category	terraform
Added on	2020-05-20
Source	source

Terraform does not yet (as of 0.12) support depends_on natively on modules.

The behaviour may be emulated like so:

# File fancy-app-module/variables.tf
variable depends_on { default = [], type = "list"}

# File my-app.tfmodule "app" {
    source  = "modules/fancy-app-module"
    # Wait for resources and associations to be created
    depends_on = [
        "${aws_alb_target_group.app.arn}"
    ]
}
resource "aws_alb_target_group" "app" {
    name     = "app-group"
}
resource "aws_alb_listener" "front_end" {
   # Association of default_action takes some time and
   # if this action is required by you module, it's creation
   # might fail due to async provisioning of the
   # resources by terraform
   default_action {
        target_group_arn = "${aws_alb_target_group.app.id}"
        type             = "forward"
    }
}