[SOLVED] Terraform ec2 instance type on condition?

Issue

I want to create spot instances on a condition from the .tfvars file. Otherwise I want a regular ec2 instance. I know there's a ternary condition, but unsure how to properly use it.

spot = var.spot_instance ? instance_market_options {
    market_type = "spot"
  } : 

resource "aws_launch_template" "foo" {
  name = "foo"
  iam_instance_profile {
    name = "test"
  }
  image_id = "ami-test"
  instance_market_options {
    market_type = "spot"
  }
  instance_type = "t2.micro"
}

Or could it be this?

instance_market_options = var.spot_instance ? {
    market_type = "spot" 
  } : 

Solution

Since the code snippet does not seem like it's whole, this should look something like the following:

resource "aws_launch_template" "foo" {
  name = "foo"
  iam_instance_profile {
    name = "test"
  }
  image_id = "ami-test"

  dynamic "instance_market_options" {
    for_each = var.spot_instance ? [1] : []
    content {
      market_type = "spot"
    }
  }
  instance_type = "t2.micro"
}

This is using a combination of for_each meta-argument and dynamic block. Additionally, you cannot use any conditions in the *.tfvars files.

Answered By - Marko E

Answer Checked By - Marilyn (WPSolving Volunteer)