Conditional nested block in Terraform resource

Question

Given this resource:

resource "google_compute_instance" "instance" {
    ...
    network_interface {
        ...
        access_config {
            ...
        }
    }
}

I'd like to conditionally define the access_config property based on a condition.

[Edit] Solution

resource "google_compute_instance" "instance" {
    ...
    network_interface {
        ...
        dynamic "access_config" {
            for_each = var.condition ? [1] : []
            content {
                ...
            }
        }
    }
}

Could you please update with the results of your dynamic nested block? Also, this may end up being an issue on the Terraform Github tracker. — Matthew Schuchard
– Matthew Schuchard, Commented Oct 2, 2019 at 16:10
Actually I discovered that the syntax that I wrote is correct! My IDE was simply complaining and I assumed there was something wrong... my bad! — rickyalbert
– rickyalbert, Commented Oct 3, 2019 at 7:22

jlim · Accepted Answer · 2021-01-25 06:45:04Z

5

Similar to what Josep Nadal mentioned, but change count to for_each like

  dynamic "access_config" {
    for_each = var.conditional_on ? ["1"] : []
    content {
      nat_ip = null
    }
  }

answered Jan 25, 2021 at 6:45

jlim

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Comments

Josep Nadal · Accepted Answer · 2019-10-02 16:05:22Z

-1

I am not really familiar, but I think you can accomplish this using the count parameter.

First you need to add a variable into your variables.tf file:

variable "conditional_on" {
  description = "enable or disable"
  type        = bool
}

Then you can add the count parameter with the variable:

resource "google_compute_instance" "instance" {
    ...
    network_interface {
        ...
        dynamic "access_config" {
            count = var.conditional_on ? 1 : 0
            content {
                ...
            }
        }
    }
}

There is more information on the Terraform Documentation: https://www.terraform.io/docs/configuration-0-11/interpolation.html#conditionals

answered Oct 2, 2019 at 16:05

Josep Nadal

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3 Comments

Comfortably Numb Over a year ago

Either I am missing something or dynamic blocks don't support count

Abhishek Solanki Over a year ago

did anyone found answer for this ?

Arcones Over a year ago

for me only works with for each, not with count

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