CODEWITHSUNDEEP
terraformterraform-provider-azure
Tim Dunphy
Tim Dunphy

Reputation: 879

Terraform key does not identify an element in this collection

I'm following a terraform tutorial on using variables in AWS.

It defines AMI variables like:

variable "amis" {
  type = "map"
  default = {
    "us-east-1" = "ami-b374d5a5"
    "us-west-2" = "ami-fc0b939c"
  }
}

And then assigns the AMI variable like this:

resource "aws_instance" "example" {
  ami           = var.amis[var.region]
  instance_type = "t2.micro"
}

If I try the example that way I get an error:

Error: Invalid index

  on main.tf line 17, in resource "aws_instance" "example":
  17:   ami                    = var.amis[var.region]

The given key does not identify an element in this collection value: string
required.

However I can set the variable by hard coding it:

var.amis["us-west-2"] # <-- this works

What can I do to set the variable correctly with ami = var.amis[var.region] ?

Upvotes: 0

Views: 5388

Answers (1)

Surya Prakash Patel
Surya Prakash Patel

Reputation: 731

you need to define variable var.region or you can pass the value to variable during plan / apply as terraform plan -var 'region=us-west-2' and terraform apply -var 'region=us-west-2'

Upvotes: 2

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