CODEWITHSUNDEEP
terraformterraform-provider-aws
NoviceMe
NoviceMe

Reputation: 3256

Terraform upgrade to .12 causing issue with element

I have following code for creating an eni: 

resource "aws_network_interface" "eth0" {
  private_ips     = "10.10.0.1"
  security_groups = ["${aws_security_group.secg1.id}"]
  subnet_id       = "${element(data.aws_subnet_ids.sub01.ids,0)}"

  lifecycle {
    ignore_changes = ["subnet_id"]
  }
}

Above code stopped working in version .12, it was working in .11. I tried following to replace element:

"tolist(data.aws_subnet_ids.trust-sub01.ids)[0]"

and:

"index(data.aws_subnet_ids.trust-sub01.ids)[0]"

both are not working it is giving me an error "The subnet ID does not exist"

Upvotes: 1

Views: 108

Answers (1)

Carlo Mencarelli
Carlo Mencarelli

Reputation: 718

Is there any reason you're not just using the aws_subnet data source. You can dial in which subnet gets returned using filters and then use the id attribute from that:

data "aws_subnet" "default" {
  vpc_id = "vpc-0dfc13e14b4e1fa57"
  filter {
    name   = "availability-zone-id"
    values = ["use1-az4"]
  }
}

resource "aws_network_interface" "eth0" {
  private_ips = "172.31.16.1"
  subnet_id = data.aws_subnet.default.id

  lifecycle {
    ignore_changes = ["subnet_id"]
  }
}

If you have to use aws_subnet_ids like creating a network interface for each subnet you could do something like this: 

data "aws_subnet_ids" "default" {
  vpc_id = "vpc-0dfc13e14b4e1fa57"
}

resource "aws_network_interface" "eth0" {
  count = length(data.aws_subnet_ids.default.ids)
  subnet_id = element(tolist(data.aws_subnet_ids.default.ids),count.index)

  lifecycle {
    ignore_changes = ["subnet_id"]
  }
}

Upvotes: 1

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