How to get an item from a list

[gitted]

I am using the vpc module, and I am creating 3 private subnets:

private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]

How would I reference the 1st, 2nd or 3rd item in the list?

[Lowe Schmidt]

When you say "the vpc module" do you mean the tf_aws_vpc community module? I'm assuming yes.

To reference the private_subnets from the module you would do "${module.my_vpc.private_subnets[0]}" for the first element in the list. And 1, 2 .. N for each following item. 

Here is the line from the module https://github.com/terraform-community-modules/tf_aws_vpc/blob/master/outputs.tf#L1 

and here's a link to the interpolation documentation https://www.terraform.io/docs/configuration/interpolation.html. 

--

Lowe Schmidt | +46 723 867 157

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[gitted]

Thanks!

BTW, why isn't this allowed?

environment = "development"

db_instance = "app_main-${var.environment}"

I basically want to use another variable when creating a variable.  Not possible?

On Tuesday, February 14, 2017 at 4:02:42 AM UTC-5, Lowe Schmidt wrote:

When you say "the vpc module" do you mean the tf_aws_vpc community module? I'm assuming yes.

To reference the private_subnets from the module you would do "${module.my_vpc.private_subnets[0]}" for the first element in the list. And 1, 2 .. N for each following item. 

Here is the line from the module https://github.com/terraform-community-modules/tf_aws_vpc/blob/master/outputs.tf#L1 

and here's a link to the interpolation documentation https://www.terraform.io/docs/configuration/interpolation.html. 

--

Lowe Schmidt | +46 723 867 157

On 14 February 2017 at 04:49, gitted <sahme...@gmail.com> wrote:

I am using the vpc module, and I am creating 3 private subnets:

private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]

How would I reference the 1st, 2nd or 3rd item in the list?

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[Lowe Schmidt]

No, right now variables do not allow interpolations in them.

You can do:

variable "environment" { default = "staging" }

variable "app_instance" { default = "app-main" }

resource "aws_elastic_beanstalk" {

...

db_instance = "${var.app_instance}-${var.environment}" 

...

}

but you can't do 

variable "db_instance" { default = "${var.app_instance}-"${var.environment}" }

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Lowe Schmidt | +46 723 867 157

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